The kinetic energy change of a diffuser operating at a steady state is 10 kJ/kg.
The kinetic energy change of the fluid is equal to the work done by the fluid on the surroundings, as it is assumed that there are no changes in potential energy in a steady-state diffuser. Thus, the work done by the fluid on the surroundings is equal to the kinetic energy change.
It can be assumed that the diffuser is an adiabatic system, meaning there is no heat transfer to or from the system. This means that the change in enthalpy is equal to the change in the internal energy of the system. Since the diffuser is operating at a steady state, the change in kinetic energy is zero.
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g n what range of ph values a newly discovered amino acid could act as a buffer? this amino acid has pk1
Answer: A newly discovered amino acid could act as a buffer at pH values within the range of its two ionizable forms, pk1 and pk2.
The newly discovered amino acid can act as a buffer within the pH range between its two ionizable forms. An amino acid contains two functional groups; the amino group (-NH2) and the carboxyl group (-COOH).
These two groups of atoms, being acidic and basic respectively, behave like a weak acid and a weak base. Consequently, the amino acid solution can function as a buffer at the pH value equal to the sum of the two pKa values.
The pKa of the amino group is known as pk1, and the pKa of the carboxyl group is known as pk2. The pKa of an acid is the pH at which half the acid is ionized and half is not. In other words, pKa is a measure of the acidity of an acid. The lower the pKa, the stronger the acid is.
When the pH is equal to the pKa value of the amino acid, the concentration of acid and conjugate base will be the same. When the pH is one unit higher than the pKa value, the proportion of basic form increases by tenfold compared to the acidic form.
When the pH is one unit lower than the pKa value, the concentration of acidic form is tenfold greater than the concentration of basic form.
Therefore, a newly discovered amino acid could act as a buffer at pH values within the range of its two ionizable forms, pk1 and pk2.
The pH range over which buffering is most effective is between pk1 and pk2. The pKa values of an amino acid will determine the range of pH values over which it can act as a buffer.
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a solution at room tempearature with a ph of less than 7 will be: select the correct answer below: acidic basic neutral depends on the solution
a. Acidic
b. Basic
c. Neutral
d. Depens on the solution
The correct answer is the option a) acidic. A solution at room temperature with a pH of less than 7 will be acidic.
What are acids and bases?Acids and bases are two types of chemical compounds that are important to human life. Acids are substances that have a pH of less than 7. They taste sour and, when mixed with a base, form a neutral substance. Acids are often used in industrial processes, such as cleaning or etching metals, as well as in medicine.
Bases are substances that have a pH of greater than 7. They taste bitter and have a slippery feel. When mixed with an acid, they form a neutral substance. Bases are commonly used in cleaning products and in the production of fertilizers and plastics.
A solution at room temperature with a pH of less than 7 will be acidic.
Therefore, the correct answer is (a) Acidic.
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generally only the carbonates of the group 1 elements and the ammonium ion are soluble in water; most other carbonates are insoluble. how many milli- liters of 0.125 m sodium carbonate solution would be needed to precipitate the calcium ion from 37.2 ml of 0.105 m cacl2 solution?
The volume of the sodium carbonate needed to precipitate is 31.248 ml. This is calculated using the dilution formula.
The molarity of the solution and the volume of the first solution can be correlated with the molarity and the volume of diluted solution. It is called as dilution formula.
Molar concentration is the another term for molarity. Molarity is a measure of the concentration of a chemical species in particular of a solute in a solution in terms of amount of substance per unit volume of solution.
The expression for molarity of the solution is,
M1 V1 = M2 V2
here we have 0.125 m sodium carbonate solution would be needed to precipitate the calcium ion from 37.2 ml of 0.105 m cacl2 solution.
putting all the values we get,
0.105 * 37.2 = 0.125 * V2
V2 = 31.248
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what volume of 0.415 m silver nitrate will be required to precipitate as silver bromide all the romide in 35.0 ml of 0.128 m calcium bromide?
The volume of 0.415 M silver nitrate needed to precipitate all the bromide in 35.0 mL of 0.128 M calcium bromide is 5.41 mL.
There are different ways to approach stoichiometry problems, but one common method is to use the balanced chemical equation, the molar ratios, and the concentration-volume relationships.
The balanced chemical equation for the precipitation reaction between silver nitrate and calcium bromide:AgNO3(aq) + CaBr2(aq) → AgBr(s) + Ca(NO3)2(aq)
Determine the limiting reactant and the theoretical yield of silver bromide.
Use the molar mass of AgBr to convert its moles to grams or volume of the precipitate.
The moles of calcium bromide:moles of CaBr2 = concentration × volume (in liters)moles of CaBr2 = 0.128 mol/L × 0.035 Lmoles of CaBr2 = 0.00448 mol
Use the molar ratio between CaBr2 and AgNO3 to find the moles of AgNO3 needed to react with all the bromide ions.
moles of AgNO3 = moles of CaBr2 × (1 mol AgNO3/1 mol CaBr2)moles of AgNO3 = 0.00448 mol × (1 mol AgNO3/2 mol Br-)moles of AgNO3 = 0.00224 mol
Since the stoichiometry of the reaction is 1:1 for AgBr and AgNO3, the theoretical yield of AgBr is also 0.00224 mol.
The volume of 0.415 M AgNO3 needed to provide the theoretical yield of AgBr.
Use the concentration-volume relationship to find the volume of AgNO3 that contains the same amount of moles as the theoretical yield of AgBr.
Moles of AgNO3 = 0.00224 molvolume of AgNO3 = moles of AgNO3/concentration of AgNO3volume of AgNO3 = 0.00224 mol/0.415 mol/Lvolume of AgNO3 = 0.00541 L or 5.41 mL
Therefore, the volume of 0.415 M silver nitrate needed to precipitate all the bromide in 35.0 mL of 0.128 M calcium bromide is 5.41 mL.
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What salt would be produced by the reaction of H2SO4 with LiHCO3? a) Li2S b) LiSO4
c) Li2SO4 d) Li2CO3
The salt that would be produced by the reaction of H2SO4 with LiHCO3 is option C-Li2SO4.
Lithium sulfate (Li2SO4) is an inorganic compound with the formula Li2SO4. It is a white crystalline material that is soluble in water. The salt would be produced as a result of the following reaction: H2SO4 + LiHCO3 → Li2SO4 + H2O + CO2.
Lithium carbonate (Li2CO3) would not be produced in this reaction because LiHCO3 reacts with H2SO4 to form Li2SO4. Li2S cannot be produced because it requires Li2S2, which is not one of the reactants or products. LiSO4 is not produced because H2SO4 reacts with LiHCO3 to form Li2SO4 instead. Thus, option (c) Li2SO4 is the correct answer.
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A sample of glucose reacts in anaerobic respiration. The right-hand box below shows a particle diagram of the moles of substances present after the reaction is complete.
On a piece of paper draw the "Before" box as shown and draw a particle diagram of the reactant molecules that produced the mixture shown on the right.
The balanced equation for anaerobic respiration that would obviously fit the model is; C6H12O6 ---->2C2H5OH + 2CO2
What is the equation of anaerobic respiration?The equation for anaerobic respiration (in the absence of oxygen) in humans and animals is:
Glucose → Lactic Acid + Energy (ATP)
The equation for anaerobic respiration (in the absence of oxygen) in plants and some microorganisms is:
Glucose → Ethanol + Carbon Dioxide + Energy (ATP).
Hence, we can see that this is way that anaerobic respiration occurs.
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which statement is true a-in a reaction, oxidation can occur independently of reduction b-a redox reaction involves either the transfer of an electron or a change in oxidation state of an element c-if any of the reactants or products in a reaction contain oxygen the reaction is a redox reaction d- the reducing agent reduces another substance and is itself oxidized
The correct statement is option B - A redox reaction involves either the transfer of an electron or a change in oxidation state of an element.Redox reactions involve the transfer of electrons from one substance to another.
The term "redox" refers to the simultaneous oxidation and reduction of molecules in the reaction, with one molecule losing electrons and the other gaining electrons.
Redox reactions is:Oxidation: Loss of electronsReduction: Gain of electrons. A molecule or atom that loses electrons is said to be oxidized, while one that gains electrons is said to be reduced.
The oxidized substance is an oxidizing agent, while the reduced substance is a reducing agent.
The statement "A redox reaction involves either the transfer of an electron or a change in oxidation state of an element" is true as the redox reaction involves both reduction and oxidation reactions.
Any substance that is oxidized should be reduced by another substance, and vice versa. Thus, a redox reaction involves the transfer of electrons from one substance to another.
Although oxygen is often present in redox reactions, it is not a necessary component of them. So, the statement C is false, and oxidation can not occur independently of reduction, so the statement A is false too.
The reducing agent reduces another substance and is itself oxidized; thus, statement D is also true.
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if two surface water types with the same density but different salinities and temperatures mix, the resulting water will be .
If two surface water types with the same density but different salinities and temperatures mix, the resulting water will be denser than both the surface water types.
Areas under warm and high salinity surface water with an appreciable depth, the temperature and salinity decreases with depth and internal vertical mixing processes occur despite stability of the water column. Eventually, this phenomenon is caused by the ability of the sea water to lose or gain heat by conduction and loss or gain of salt takes place by diffusion. This causes the density of the moving water to change directions.
Salt water mixes over limited depths and forms homogenous layers.
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How does matter, such as carbon, move through an environment?
Carbon and other types of matter can move through the environment through a combination of physical, biological, and human processes.
How does matter, such as carbon, move through an environment?Matter, including carbon, can move through an environment in several ways, including:
Diffusion: Diffusion is the movement of particles from an area of high concentration to an area of low concentration. Carbon can diffuse through the air or water from areas where it is more concentrated to areas where it is less concentrated.
Advection: Advection is the movement of matter due to the flow of a fluid, such as air or water. Carbon can be transported through the environment by advection, for example, by wind carrying carbon particles or by water currents transporting dissolved carbon.
Biogeochemical cycling: Carbon can also be cycled through the environment by biological and geological processes. Plants and algae take up carbon dioxide from the air or dissolved carbon from water and convert it into organic matter through photosynthesis. This organic matter can then be consumed by other organisms, leading to the transfer of carbon through the food chain. Carbon can also be stored in soils and sediments for long periods of time.
Human activities: Human activities can also move carbon through the environment. For example, the burning of fossil fuels releases carbon dioxide into the atmosphere, which can then be transported by diffusion and advection. Land-use changes, such as deforestation, can also affect the cycling of carbon through the environment.
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the complex process whereby silicate minerals such as feldspar are broken down to make clay minerals by reacting with water molecules is .
The complex process whereby silicate minerals such as feldspar are broken down to make clay minerals by reacting with water molecules is known as hydrolysis.
Hydrolysis is the process of breaking down a compound by adding water to it. It is a chemical process in which water reacts with minerals to form new compounds with new structures. The process is a crucial part of the formation of clay minerals. Hydrolysis is a common process in nature and occurs when water reacts with minerals to form new compounds. This reaction occurs in soil, rocks, and other natural materials.
The hydrolysis process breaks down minerals such as feldspar and releases other minerals like aluminum and iron oxides. The hydrolysis of silicate minerals such as feldspar creates clay minerals. This process is responsible for the formation of clay minerals, which are an important component of soil.
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all atoms can be easily detected by atomic emission, this is advantageous compared with atomic absorption. group of answer choices true false
The statement, "all atoms can be easily detected by atomic emission, this is advantageous compared with atomic absorption," is false.
Atomic absorption and atomic emission spectroscopy are two commonly employed techniques for the determination of elements present in a sample.
The advantage of atomic emission spectroscopy over atomic absorption spectroscopy, and vice versa, is dependent on the particular sample to be analyzed.
The principle of atomic absorption spectroscopy is that an atom in the gaseous state absorbs ultraviolet or visible radiation to move from the ground state to an excited state.
As a result, the intensity of the transmitted radiation decreases in proportion to the concentration of the absorbing species.
When a sample is analyzed, the sample is vaporized and the amount of absorption is measured at a specific wavelength.
The amount of radiation that is absorbed by the sample is directly proportional to the amount of the analyte present in the sample.
This information can then be used to estimate the analyte's concentration in the original sample.In atomic emission spectroscopy, the sample is excited by a high-energy source, causing the atoms to reach a higher energy state.
The atoms will eventually return to their ground state by releasing the excess energy, which is emitted as light.
The frequency and intensity of the light emitted is used to determine the concentration of the analyte present in the sample. This process is known as atomic emission spectroscopy.
Atomic absorption spectroscopy is superior in cases where the analyte concentration is low or the sample is a complex mixture,
whereas atomic emission spectroscopy is superior when high sensitivity is required or when the sample contains multiple elements.
Thus, it can be concluded that not all atoms can be easily detected by atomic emission, and that both methods have advantages and disadvantages.
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at what temperature is the system at equilibrium? at what temperature is the system at equilibrium? t>250k t<250k t
If the value of ΔG° is equal to 0, then the value of K or Kp is equal to 1 and the system is said to be in equilibrium.
A change in temperature occurs when heat flow increases or decreases the temperature. This changes the chemical equilibrium towards the products or the reactants. This can be identified by examining the reaction and determining whether it is an endothermic reaction or an exothermic reaction.
If the temperature is raised, the equilibrium constant decreases. If the forward reaction has an endothermic nature, the equilibrium constant increases. The equilibrium position also changes when the temperature is changed.
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which of the following most favors elimination rather substitution in a reaction with 2-bromopropane? question 6 options: sodium methoxide sodium ethoxide sodium isoproxide sodium tert-butoxide
The best choice to favor elimination over substitution in a reaction with 2-bromopropane is sodium tert-butoxide. This is because this reagent is a stronger base, allowing for the deprotonation of 2-bromopropane.
The reaction of 2-bromopropane most favors elimination over substitution when reacted with the sodium tert-butoxide favors elimination over substitution in a reaction with 2-bromopropane.
In organic chemistry, substitution reaction occurs when an atom or a group of atoms in a molecule is replaced by another atom or a group of atoms. In contrast, elimination reactions occur when atoms or groups of atoms are removed from a molecule. The most significant difference between the two is that one leaves another behind. This means that if one group is substituted by another, then it results in a completely different compound than before.
In the reaction between 2-bromopropane and sodium tert-butoxide, the sodium tert-butoxide (Na + OC(CH3)3) serves as a strong base. The tert-butoxide ion, as a strong base, abstracts a hydrogen ion from a carbon adjacent to the bromine, leading to the formation of a reactive alkene intermediate.
The elimination of HBr from 2-bromopropane to form propene is made possible by this alkene intermediate. Therefore, the reaction most favors elimination over substitution when reacted with sodium tert-butoxide.
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ms. salis explains to her class that sodium (na) and chlorine (cl) atoms bond to make table salt (nacl). which is the best description of table salt?
Two elements, sodium (Na) and chlorine (Cl) come together, they form a compound called sodium chloride (NaCl), which is also known as table salt.
Table salt is that it is a chemical ionic compound made up of sodium and chlorine atoms that are bonded together.
Table salt is one of the most common chemical compounds found on earth. It is a white, crystalline substance that is highly soluble in water. It is used in many ways, including cooking, preserving food, and as a seasoning.
Table salt has a number of properties that make it useful in various applications. It is highly reactive with other chemicals, which makes it a good cleaning agent.
It is also highly conductive, which makes it useful in electrochemical applications. Additionally, it is non-toxic, which makes it safe to use in food applications.
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a vessel contains a stoichiometric mixture of butane and air. the vessel is at a temperature of 500 k, a pressure of 1 atm, and has a volume of
The final pressure and temperature are 1.131 atm and (0.9786 mol/ 0.8546 mol).
What is a chemical equation with an example?A chemical equation serves as a metaphor for the transformation of reactants into products. Iron sulfide, for instance, is created when iron (Fe) and sulfur (S) mix (FeS). Fe(s) + S(s) = FeS (s) Iron reacts with sulfur, as indicated by the + sign.
For the complete combustion of butane, the following chemical equation is balanced:
2C4H10 + 13O2 → 8CO2 + 10H2O
mass of butane = (number of moles of butane) x (molar mass of butane)
= (number of moles of oxygen) x (molar mass of oxygen)
= (mass of oxygen) / (molar mass of oxygen) x (molar mass of butane)
The mass of oxygen can be calculated from the ideal gas law:
PV = nRT
n = PV / RT
The amount of moles of oxygen can be determined using this equation with P = 1 atm, V = 5 L, and T = 500 K:
n = (1 atm) x (5 L) / [(0.08206 L atm mol⁻¹ K⁻¹) x (500 K)]
= 0.1222 mol
The mass of butane is:
mass of butane = (0.1222 mol) x (58.12 g/mol)
= 7.11 g
Before the reaction, there were n = 0.1222 mol (butane) + (13/2) x 0.1222 mol moles of gas in the vessel (oxygen)
= 0.8546 mol
The balanced equation:
n = (8/2) x 0.1222 mol (carbon dioxide) + (10/2) x 0.1222 mol (water vapor)
= 0.9786 mol
Solving for P2, we get:
P2 = (n2 / n1) x (T1 / T2) x P1
= (0.9786 mol / 0.8546 mol) x (500 K / T2) x (1 atm)
= 1.131 atm
Solving for T2, we get:
T2 = (n2 / n1) x (P1 / P2) x T1
= (0.9786 mol / 0.8546 mol)
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Question:
A vessel contains a stoichiometric mixture of butane and air. The vessel is at a temperature of 500 K, a pressure of 1 atm, and has a volume of 5 L. If the reaction goes to completion, what volume of gas will be present in the vessel after the reaction and what will be the final pressure and temperature? Assume ideal gas behavior and that the reaction occurs with complete combustion.
(ANSWER THE FULL THING PLS OR I WILL REPORT, if you do answer it all, I will mark brainliest)
In a model experiment baking soda (sodium bicarbonate) is combined with white vinegar (5% acetic acid) under the following circumstances:
Sodium bicarbonate + acetic acid → carbon dioxide + water + sodium acetate
NaHCO3 (s) + CH3COOH (l) → CO2 (g) + H2O (l) + NaCH3COO (aq)
1. What are the “reactants” in this reaction?
2. What “forms” are the reactants each in?
3. What are the “products” in this reaction?
4. What “forms” are each product in this reaction found in?
5. Is this equation balanced? Why or why not?
6. If I told you this reaction is “endothermic” and you touched the bottom of the catch tray after the reaction runs would it feel hot or cold? Why?
7. If I increase the amounts of both reactants would you expect the reaction to speed up or slow down? Why?
8. If I increase the amount of one reactant only, what would you expect to happen? Why?
9. How do I know that carbon dioxide is being produced? What is my “direct observation”?
10. If I went to the store and purchased apple cider vinegar which has a known concentration of 10% acetic acid and used it in place of white vinegar, what variable am I altering and what result would you expect?
11. If I tried this experiment with baking soda that had been open and in my refrigerator for two months and was still “cold” when I started the experiment, what results might we expect? Why?
12. If I was setting up my experiment and I carefully allow both the baking soda and vinegar to reach room temperature before I started my experiment - what part of an experimental design would I be affecting? Select one.
a. Independent variable
b. Dependent variable
c. Constant
d. Control
13. If I warmed my vinegar to a temperature of 85℉ from room temperature of 72℉, what result would you expect and why? Select one.
a. The reaction would proceed faster as you could see from more rapid foaming because there are more particle collisions between warmer reactants.
b. The reaction would proceed faster as you could see from more rapid foaming because there are fewer particle collisions between warmer reactants.
c. The reaction would proceed more slowly because there are more particle collisions between warmer reactants.
d. The reaction would not proceed because the activation energy wouldn’t be reached.
14. If I used laboratory grade acetic acid (100% concentration) describe how the following variables would change:
a. Concentration of reactants (independent variable) -
b. Formation of products (dependent variable) -
c. Rate of reaction (slope of the line) -
15. If this sample “unlabelled graph” were used from this experiment - how could we label each portion of the graph? What type of relationship do we see?
Answer:
The reactants in this reaction are sodium bicarbonate (NaHCO3) and acetic acid (CH3COOH).
Sodium bicarbonate is in solid form (s) while acetic acid is in liquid form (l).
The products in this reaction are carbon dioxide (CO2), water (H2O), and sodium acetate (NaCH3COO).
Carbon dioxide is in gas form (g), water is in liquid form (l), and sodium acetate is in aqueous form (aq).
This equation is balanced because the number of atoms of each element is the same on both sides of the equation.
If the reaction is endothermic and heat is absorbed, the bottom of the catch tray would feel cold because the heat is being absorbed from the surroundings.
If the amounts of both reactants are increased, the reaction would speed up because there are more reactant particles available to collide and react.
If the amount of one reactant is increased, the reaction rate would increase only up to a certain point, after which the rate would remain constant because the other reactant becomes limiting.
Carbon dioxide is being produced because bubbles of gas (CO2) are observed during the reaction.
By using apple cider vinegar with a known concentration of 10% acetic acid, the concentration of the acetic acid in the reaction is altered. This would result in a faster reaction because a higher concentration of reactants leads to more frequent collisions and a higher reaction rate.
If baking soda that has been open and in the refrigerator for two months is used, the reaction may not occur as efficiently as fresh baking soda because it may have absorbed moisture and become less reactive. This could result in a weaker reaction with less carbon dioxide produced.
The correct answer is c. Constant. By allowing both the baking soda and vinegar to reach room temperature before the experiment, you are controlling a constant variable in the experimental design.
The correct answer is a. The reaction would proceed faster as you could see from more rapid foaming because there are more particle collisions between warmer reactants.
a. If laboratory grade acetic acid (100% concentration) is used, the concentration of reactants (independent variable) would increase because the concentration of acetic acid would be higher.
b. The formation of products (dependent variable) would also increase because there would be more reactants available to react, leading to a higher yield of products.
c. The rate of reaction (slope of the line) would increase because a higher concentration of reactants leads to a higher reaction rate.
sea water contains 1.94% chlorine (by mass). how many grams of chlorine are in there in 400 ml of seawater if the density of seawater is 1.025 g/cm3.
The mass (in grams) of chlorine present in 400 mL of seawater, given that the density of seawater is 1.025 g/cm3, is 0.008 grams
How do i determine the mass of Chlorine?We'll begin by obtaining the mass of the sea water. Details below:
Volume of sea water = 400 mL = 400 / 1000 = 0.4 cm³Density of sea water = 1.025 g/cm³Mass of sea water =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of sea water = 1.025 × 0.4
Mass of sea water = 0.41 g
Finally, we shall determine the mass of chlorine in the sea water. Details below:
Mass of sea water = 0.41 gramsPercentage of chlorine = 1.94%Mass of chlorine = ?Mass of chlorine = Percentage × Mass of sea water
Mass of chlorine = 1.94% × 0.41
Mass of chlorine = 0.008 grams
Thus, the mass of chlorine is 0.008 grams
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suppose you have only 1.9 g of sulfur for an experiment and you must do three trials using 0.030 mol of s each time. do you have enough sulfur
Yes, you have enough sulfur for three trials. This is because 1.9 g of sulfur is equal to 0.09 mol, which is enough to do three trials of 0.030 mol each. Use the molar mass of sulfur, which is 32 g/mol.
Convert the mass of sulfur given to moles.
1.9 g / 32 g/mol = 0.09 mol
The moles by the number of trials you need to do:
0.09 mol x 3 trials = 0.27 mol
The moles back to grams to make sure you have enough sulfur:
0.27 mol x 32 g/mol = 8.64 g
Since the amount of sulfur given is more than the amount you need for the three trials (1.9 g > 8.64 g), you have enough sulfur.
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a 20.0 g piece of a metal with specific heat of 0.900 j/g.0c at 98.0 0c dropped into 50.0 g water in a calorimeter at 20.0 0c. the specific heat of water is 4.18 j/g.0c calculate the final equilibrium temperature of the mixture group of answer choices
The final equilibrium temperature of the mixture will be 40.5°C. Option A is correct.
To calculate the final equilibrium temperature of the mixture, we need to use the principle of conservation of energy, which states that the total energy of a closed system remains constant. In this case, the initial energy of the metal at 98.0°C is transferred to the water and calorimeter, raising their temperature until they reach a final equilibrium temperature.
We can use the following equation to calculate the final equilibrium temperature ([tex]T_{f}[/tex]) of the mixture:
m₁c₁(T₁ - [tex]T_{f}[/tex]) = m₂c₂([tex]T_{f}[/tex] - T₂)
where m₁ and c₁ are the mass and specific heat of the metal, T₁ is the initial temperature of the metal, m₂ and c₂ are the mass and specific heat of the water, and T₂ is the initial temperature of the water.
Substituting the given values, we get:
(20.0 g)(0.900 J/g°C)(98.0°C - [tex]T_{f}[/tex]) = (50.0 g)(4.18 J/g°C)([tex]T_{f}[/tex] - 20.0°C)
Simplifying and solving for [tex]T_{f}[/tex], we get:
1764 - 18[tex]T_{f}[/tex] = 2090[tex]T_{f}[/tex] - 83600
2108[tex]T_{f}[/tex] = 85364
[tex]T_{f}[/tex] = 40.5°C
Hence, A. 40.5°C is the correct option.
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--The given question is incomplete, the complete question is
"A 20.0 g piece of a metal with specific heat of 0.900 j/g.0c at 98.0 0c dropped into 50.0 g water in a calorimeter at 20.0 0c. the specific heat of water is 4.18 j/g.0c calculate the final equilibrium temperature of the mixture group of answer choices: A) 40.5°C. B) 48.9°C. C) 36.7°C. D) 45.5°C."--
what is the ph of a 0.138m solution of h3po4 (assume complete dissociation for the sake of the example)?
Answer: The pH of a 0.138 M solution of H3PO4 (assuming complete dissociation for the sake of the example) is 1.49.
The following steps can be used to determine the pH of the solution.
Phosphoric acid is a triprotic acid, which means that it can donate three hydrogen ions (H+) to a solution. Phosphoric acid's first dissociation reaction is as follows:
H3PO4(aq) → H+(aq) + H2PO4-(aq) This means that in water, H3PO4 will donate one hydrogen ion (H+) to the solution, leaving behind the negatively charged H2PO4- ion.
To determine the pH of the solution, we can use the formula:
pH = -log[H+]
First, we need to determine the concentration of H+ ions in the solution, which we can find from the dissociation of H3PO4. H3PO4(aq) → H+(aq) + H2PO4-(aq) Initially, the concentration of H3PO4 is 0.138 M. Since we're assuming complete dissociation for the sake of this example, we can say that 100% of the H3PO4 dissociates into H+ and H2PO4-.
This means that the concentration of H+ in the solution is equal to the initial concentration of H3PO4:0.138 MWe can now substitute this value into the pH formula:
pH = -log[H+]pH = -log[0.138]pH = 1.49
Therefore, the pH of the 0.138 M solution of H3PO4 (assuming complete dissociation for the sake of the example) is 1.49.
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I NEED HELP ON THIS ASAP!
The correct numbers and symbol of elements represented by X are: (1). calcium (2). 18 (3) 15
The Atomic symbolThe element's symbol, atomic number, and mass number must all be known in order to create the notation of an atom. Atomic number is written as a subscript, and the mass number of the atom appears above the symbol.We can calculate the mass of an atom by adding the numbers of protons and neutrons. The letter "A" is used to signify it. An atom's atomic number is determined by how many protons are found in its nucleus or how many electrons are present in an electrically neutral atom. The letter "Z" is used to signify it.For more information on atomic formula kindly visit to
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Give two reasons why meteorological seasons were needed?
The four traditional meteorological seasons, which are based on the annual temperature cycle and the location of the Earth in its orbit around the sun, split the year into four seasons of three months each. The following describes these seasons:
Spring: March, April, MaySummer: June, July, AugustFall (or Autumn): September, October, NovemberWinter: December, January, FebruaryHere are two reasons why meteorological seasons were needed:
Consistency: Based on the annual temperature cycle, meteorological seasons offer a consistent method of dividing the year into four separate times. This makes it simple to compare weather patterns from one year to the next and to monitor long-term weather pattern changes over time.
Ease of communication: By dividing the year into four seasons based on set calendrer months, it is simpler for people to discuss the weather and make appropriate plans for their daily activities. Because January falls within the winter season according to the meteorological calendar, it is simple to know what kind of weather to anticipate when someone states, "I'm going skiing in January."
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a solution contains 15.0 g of glycine, c2h5no2, in a total solution volume of 0.330 l. what is the concentration of glycine in the solution?
The concentration of glycine in the given solution is 0.066 M.
Concentration is defined as the amount of solute per unit volume of the solution.
Thus, the formula for calculating the concentration (C) of a solution is:
C = n/V
Where C is the concentration, n is the number of moles of solute, and V is the volume of the solution.
The formula for calculating the number of moles of a solute is given as:
m = n x M
Where m is the mass of the solute, n is the number of moles of solute, and M is the molar mass of the solute.
Using the formula given above, we can calculate the concentration of glycine in the given solution:
C = m/M x V
We know that the mass of glycine is 15.0 g and its molar mass is M(C₂H₅NO₂) = 75.07 g/mol
Substituting the given values, we get:
C = 15.0/75.07 × 0.330L= 0.066 M
Therefore, the concentration of a solution containing 15.0 g of glycine, C₂H₅NO₂, in a total solution volume of 0.330 l is 0.066 M.
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Hi all! Can you help me please? I have an assessment due soon! Thank you!
The equilibrium constant for this reaction in seawater is about 1.2 x 10-3. If you have a solution with a concentration of 0.10 moles per liter of CO2 what will your concentration of carbonic acid be at equilibrium (liquid water is not included in equilibrium constant equations for aqueous solutions and can be excluded)
The correct answer is The given reaction is:
[tex]CO2 (aq) + H2O (l) ⇌ H2CO3 (aq)[/tex]
The equilibrium constant for this reaction in seawater is about 1.2 x 10^-3. This means that at equilibrium, the ratio of the product concentrations (H2CO3) to the reactant concentrations (CO2 and H2O) is [tex]1.2 x 10^-3.[/tex]Let's assume that the concentration of CO2 in solution is 0.10 moles per liter. Since we know the equilibrium constant, we can use it to calculate the concentration of carbonic acid (H2CO3) at equilibrium. The equilibrium expression for this reaction is [tex]Kc = [H2CO3] / [CO2] [H2O][/tex]Since water is a liquid, it is not included in the equilibrium constant expression for aqueous solutions and can be excluded. Therefore, we can simplify the expression to: [tex]Kc = [H2CO3] / [CO2][/tex]We know the value of Kc and the concentration of CO2, so we can rearrange the equation and solve for the concentration of H2CO3:
[tex][H2CO3] = Kc x [CO2][/tex]
[tex][H2CO3] = (1.2 x 10^-3) x (0.10 mol/L)[/tex]
[tex][H2CO3] = 1.2 x 10^-4 mol/L\\[/tex]
Therefore, at equilibrium, the concentration of carbonic acid in the solution will be 1.2 x 10^-4 moles per liter.
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how many moles of iron metal are produced when 3.2 mol iron (iii) oxide and 2.3 mol carbon monoxide react? fe2o3 3co -------> 2fe 3co2 step by step
Answer : When 3.2 moles of iron (III) oxide and 2.3 moles of carbon monoxide react, 2 moles of iron metal are produced.
2 moles of iron metal are produced when 3.2 moles of iron (III) oxide (Fe2O3) and 2.3 moles of carbon monoxide (CO) react. The balanced chemical equation for this reaction is: Fe2O3 + 3CO --> 2Fe + 3CO2.
This reaction is a combustion reaction, meaning it involves the oxidation of iron (III) oxide by the carbon monoxide. Oxygen from the iron oxide is released as carbon dioxide (CO2) and the iron is left in the reduced form, or elemental iron (Fe).
To calculate the moles of iron metal produced, the mole ratio of Fe2O3 to Fe must be determined. From the balanced equation, it can be seen that for every 1 mole of Fe2O3, 2 moles of Fe are produced. Therefore, to calculate the number of moles of Fe, multiply the number of moles of Fe2O3 by 2. In this case, that would be 3.2 moles of Fe2O3 x 2 = 6.4 moles of Fe.
Finally, to get the number of moles of Fe metal produced, subtract the number of moles of Fe2O3 from the number of moles of Fe. In this case, 6.4 moles of Fe - 3.2 moles of Fe2O3 = 2 moles of Fe metal.
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the rate constant of a certain first order reaction is 45.9s^-1 at 300k. what is the value of the rate constant at 310.0 k? the energy of activation is 81.0 kj/mol?
Answer: The value of the rate constant at 310.0 K is 54.90 s^-1.
The Arrhenius equation is used to calculate the rate constant of a reaction. It provides a way to relate the temperature of a system to the rate constant of a reaction.
Given the rate constant of a certain first-order reaction, which is 45.9 s^-1 at 300 K, and the energy of activation of 81.0 kJ/mol, we have to calculate the rate constant at 310.0 K.
What is the Arrhenius equation?
The Arrhenius equation is given by: k = Ae^(-Ea/RT)
where: k is the rate constant of the reaction, A is the pre-exponential factor or the frequency factor, Ea is the activation energy, R is the universal gas constant (8.314 J/mol K) T is the temperature in kelvin.
From the given information: k1 = 45.9 s^-1, T1 = 300 K, T2 = 310 K, and Ea = 81.0 kJ/molCalculating the rate constant at 310.0 K using the Arrhenius equation:
k2 = Ae^(-Ea/RT2)
Taking the ratio of the two equations:
k2/k1 = (Ae^(-Ea/RT2))/(Ae^(-Ea/RT1)) k2/k1 = e^(Ea/R) (1/T1 - 1/T2)
Putting in the values:
k2/45.9
= e^ (81000/8.314) (1/300 - 1/310) k2/45.9
= 1.196k2
= 54.90 s^-1
Therefore, the value of the rate constant at 310.0 K is 54.90 s^-1.
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a popular classroom demonstration involves placing a paper cup with water in it on a burner, and boiling the water in the cup. although part of the cup may burn, the part containing the water does not because
Answer: A popular classroom demonstration involves placing a paper cup with water in it on a burner and boiling the water in the cup. Although part of the cup may burn, the part containing the water does not. This is because of the phenomenon of surface tension.
Surface tension is the force that causes the molecules at the surface of a liquid to be attracted to one another, creating a film of molecules across the surface of the liquid. This causes the water molecules to stick together and form a barrier against the heat of the flame, thus protecting the water from the heat.
The water molecules at the surface of the cup create a protective film, allowing the heat of the flame to be distributed evenly throughout the cup. This prevents the water in the cup from boiling and keeps it from burning.
The surface tension phenomenon can also be seen in other forms of liquids such as soaps and detergents. When these liquids are placed in a container and agitated, the molecules form a protective film over the surface of the liquid and prevent it from evaporating.
Surface tension is a fascinating phenomenon that can be seen in everyday life, and it can be used to explain why the paper cup does not burn when placed on a burner.
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a saturate solution of lead (ii) chloride (pbcl2) has a ksp value of 17.10-5. if 0.90 moles of chloride ions (cl-) is added to the solution, what will be the concentration of lead ions be in solution?
Therefore, the concentration of Pb2+ ions in the solution is 0.0098 M. The chemical equation describing how lead (II) chloride dissolves in water Pb2+ (aq) + 2Cl- PbCl2 (s) (aq) For this reaction.
Ksp = [Pb2 +] [Cl -] 2 We are provided that the Ksp value of PbCl2 is 1.7 × 10^-5. Also, we are informed that 0.90 moles of Cl- ions have been added to the mixture. We may assume that the concentration of Pb2+ ions is insignificant compared to the concentration of Cl- ions since the stoichiometry of the reaction is 1:2 for Pb2+:Cl-. Let x be the concentration of Pb2+ ions in the solution. Then, the concentration of Cl- ions is 2x (because the stoichiometry is 1:2 for Pb2+:Cl-). The total concentration of Cl- ions in the solution is therefore:
[Cl-]total = 2x + 0.90
Since the solubility product expression for[tex]PbCl2 is Ksp = [Pb2+][Cl-]^2, \\[/tex]we can write:
[tex]Ksp = x(2x + 0.90)^2Solving for x, we get:x = 0.0098 M[/tex]
Therefore, the concentration of Pb2+ ions in the solution is 0.0098 M.
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Answer:
Explanation:
The statement mentioned in the question is not a question. However, I can provide some information related to the given statement.Nickel(II) chloride refers to the chemical compound with the formula NiCl2. It is also known as Nickelous chloride. When nickel(II) chloride is dissolved in water, it forms a saturated solution of concentration 1 M (1 mole/Liter). A saturated solution refers to the solution in which no more solute can be dissolved in it at a given temperature and pressure.To summarize, the given statement means that if you dissolve nickel(II) chloride in water, you will obtain a saturated solution of concentration 1 M (1 mole/Liter).
the precise amount of air required for the complete combustion of a hydrocarbon can be calculated by considering the stoichiometric conversion of the hydrocarbon to co2 and h2o. determine the stoichiometric air-fuel ratios for combustion of cyclohexane, cyclohexene, and benzene.
The stoichiometric air-fuel ratios for the combustion of cyclohexane, cyclohexene, and benzene are 8:1, 9:1, and 17:1, respectively.
The stoichiometric air-fuel ratio for combustion of hydrocarbons, such as cyclohexane, cyclohexene, and benzene, is the amount of air necessary for complete combustion of the hydrocarbon.
This can be determined by considering the stoichiometric conversion of the hydrocarbon to carbon dioxide (CO2) and water (H2O).
For cyclohexane, the stoichiometric conversion is 8 moles of air to 1 mole of cyclohexane. This means the stoichiometric air-fuel ratio is 8:1.
Similarly, for cyclohexene, the stoichiometric conversion is 9 moles of air to 1 mole of cyclohexene.
Therefore, the stoichiometric air-fuel ratio for cyclohexene is 9:1. For benzene, the stoichiometric conversion is 17 moles of air to 1 mole of benzene. This yields a stoichiometric air-fuel ratio of 17:1.
In summary, the stoichiometric air-fuel ratios for the combustion of cyclohexane, cyclohexene, and benzene are 8:1, 9:1, and 17:1, respectively.
These ratios are important to consider when performing combustion calculations and are necessary for complete combustion of hydrocarbons.
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What is the difference between reactants and products?
Group of answer choices
A Reactants are substances that are combined to form products in a physical reaction. Products are the result of substances being combined in a chemical reaction.
B Reactants are substances that are combined to form products in a chemical reaction. Products are the result of substances being combined in a physicalreaction.
C none of the above
D Reactants are substances that are combined to form products in a chemical reaction. Products are the result of substances being combined in a chemical reaction.
The correct answer is D. Reactants are substances that are combined to form products in a chemical reaction. Products are the result of substances being combined in a chemical reaction.