when a bunsen burner is properly adjusted, the flame looks Blue with no gap between the burner and the flame.
A Bunsen burner is a particular kind of gas burner that is frequently utilized as a heat source in lab investigations. The barrel or chimney of the burner is made up of a straight tube that extends vertically from a flat base. At the bottom of the chimney, liquid petroleum gas, such as propane or butane, or natural gas, primarily methane, is delivered.
The base of the chimney on Bunsen burners typically has a hose barb installed so that rubber tubing may supply the gas from a gas nozzle on the lab bench.
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16.Solid carbon dioxide (dry ice) passes directly into the gaseous state. The name for this process is...Select one:a. boiling.b. evaporation.c. melting.d. sublimation.
Answer:
[tex]D[/tex]Explanation:
Here, we want to select the correct option
We evaluate each of the options as follows:
a) Boiling
It is a state that occurs when the vapor pressure equals atmospheric pressure for liquid substances
b) Evaporation
Evaporation occurs when liquid substances change directly into the gaseous state
c) Melting is the change from the solid state to the liquid state
d) Sublimation is the direct change of a substance from the solid to the vapor state. We can see this in iodine and naphthalene
What is the pressure, in mmHg, of a 4.50 g sample of O2 gas, which has a temperature of 33.0 °C, and a volume of 2600 mL?
We are going to assume that the gas behaves like an ideal gas, so we can apply the following equation:
[tex]\begin{gathered} PV=nRT \\ P=\frac{nRT}{V} \end{gathered}[/tex]Where,
P is the pressure of the gas in atm
V is the volume of the gas in liters, 2600mL=2.6L
n is the number of moles
R is a constant, 0.08206atm.L/mol.K
T is the temperature in Kelvin, 33.0°C=306.15K
Now we need to find the moles of O2 to plug into the equation. We divide the grams by the molar mass of O2. The molar mass of O2 is 31.9988g/mol.
[tex]\begin{gathered} molO_2=4.50g\times\frac{1molO_2}{MolarMass,gO_2} \\ molO_2=4.50g\times\frac{1molO_2}{31.9988gO_2}=0.140molO_2 \end{gathered}[/tex]We substitute the values in the ideal gas equation:
[tex]\begin{gathered} P=\frac{nRT}{V} \\ P=\frac{0.140molO_2\times0.08206\frac{atm.L}{mol.K}\times306.15K}{2.6L} \\ P=1.36atm \end{gathered}[/tex]Now, we convert the atm to mmHg:
[tex]\begin{gathered} P=1.36atm\times\frac{760mmHg}{1atm} \\ P=1033mmHg \end{gathered}[/tex]Answer: The pressure of the gas is 1033mmHg
A saturated solution of MgF2 is prepared at 27°C. After equilibrium has been reached, the concentrationof magnesium ions in the solution is found to be 1.2 x 10-3 M. Type in the correct values for A and B inthe ICE table.A:Mg2+(aq)2F (aq)1SolidAMBMB:DONEс-Dissolvedsolid+?M+?MELess solid?M?MIntro
Answer:
A: 0
B: 0
Explanation:
Initially the concentration of Mg+2 ions and F- ions is zero. The ICE table is:
Calculate the total energy 2.3 * 10^11 photons of gamma radiation having a wavelength of 3.9 * 10^-12 m
According to the Planck's equation,the total energy of 2.3×10¹¹ photons of gamma radiation is 11.7208×10[tex]^-3[/tex] J.
What is Planck's equation?Max Planck discovered the theory which stated that energy is transferred in the form of discrete packs which are called quanta and thus proposed an equation called the Planck's equation which relates energy and frequency of a photon and is given as, E=hcυ or in terms of wavelength it is ,E=hc/λ.
The equation makes use of a constant which is called the Planck's constant and it's value is 6.626×10[tex]^-34[/tex] Js.
In the given problem, the energy is calculated as, E=6.626×10[tex]^-34[/tex]×3×10⁸/3.9×10[tex]^-12[/tex]=5.096×10[tex]^-14[/tex] J.
Thus,for 2.3×10¹¹ photons it is 5.096×10[tex]^-14[/tex] ×2.3×10¹¹ =11.7208×10[tex]^-3[/tex] J.
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what are the numbers in an equation under the letter called? and can they be changed or not. For example, the 2 under O2
- The numbers are called subscripts which is the total atoms of the elements present in a compound.
- The subsripts can change depending on the type of compound.
Explanations:The subcripts in a chemical compounds allow us to us know or determine the total atoms of such element that is present in the compound. For instance, in H2O (water), the subscript 2 in H2O shows that there 2 atoms of hydrogen in the compound (H2O).
They numbers differs depending on the type of compound. For instance O2 is oxygen while O3 is ozone
need help with this pleaseeeeeeeeeeeeeeWhat trends do you see in the organisms of the ecosystem if youdecrease sunlight A. Increase in energy storage moleculesB. Decrease in H2OC. Decrease in energy storage moleculesD. Increase in CO2
Answer:
Explanations:
Answer:
Explanations:
In order to both shift the equilibrium and increase the amount of NH3, we should
Answer:
D. 2 and 3 only.
Explanation:
First let's remember the Le Chatelier's Principle: Le Chatelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish equilibrium.
Let's see the reaction:
[tex]N_2+3H_2\leftrightarrows2NH_3,\text{ }\Delta H=-92\text{ kJ.}[/tex]You can note that this reaction is exothermic. If we want the equilibrium to move to the left, we have to increase the temperature. In this case, we don't want that because we want to increase the concentration of NH3 and this means that the equilibrium goes to the right, so we have to decrease the temperature.
In the case of pressure, if we want to reach the equilibrium to the right, where is NH3, we have to increase the pressure because the pressure will move in such a way as to decrease the pressure again.
The answer would be D. 2 and 3 only.
Predict the products for each of the following reactions. Write the molecular equation, the complete ionic equation, and the net ionic equation. Classify the reactions in as many ways as you can.
Aqueous sulfuric acid is added to aqueous potassium hydroxide.
The molecular equation of the reaction of sulfuric acid and aqueous potassium hydroxide:
H₂SO₄ (aq) + 2 KOH (aq) → K₂SO₄ (aq) + 2H₂O (l)
The net ionic equation is:
2H⁺ (aq) + 2OH⁻ (aq) [tex]\longrightarrow[/tex] 2H₂O (l)
What are the net ionic equations?The net ionic equation of a reaction can be described as an equation that expresses only those elements, compounds, or ions that directly contributed in that chemical reaction.
The balanced chemical equation reaction of sulfuric acid and aqueous potassium hydroxide:
H₂SO₄ (aq) + 2 KOH (aq) → K₂SO₄ (aq) + 2H₂O (l)
The complete ionic equation for the above reaction can be written as follows:
2H⁺ (aq) + SO²₄⁻ (aq) + 2K⁺(aq) + 2OH⁻ → 2K⁺ (aq) + SO₄²⁻ (aq) + 2H₂O (l)
In the ionic equation, the potassium and sulfate ions appear unchanged on both sides of the equation. When we mix the two solutions, the potassium and sulfate ions do not participate in the reaction. So potassium and sulfate ions can be eliminated from the ionic equation.
2H⁺ (aq) + 2OH⁻ (aq) [tex]\longrightarrow[/tex] 2H₂O (l)
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what is the pH solution containing 0.3 M HCOOH and 0.52 M HCOOK?
First, we need the reaction to start the exercise.
HCOOH(aq) + H2O(l) = H3O+(aq) + HCOO-(aq)
HCOOK => HCOO- + H+
------------------------------------------------------------------------
pH)
We have here an ionic equilibrium, HCOOH is a weak acid.
pKa = 3.77 (from tables)
The concentration of HCOOH 0.3 M
The concentration of HCOO- = 0.52 M HCOOK.
If we propose Ka for HCOOH(aq)
[tex]Ka\text{ = }\frac{\lbrack H_3O^+\rbrack x\lbrack HCOO-\rbrack^{_{}}}{\lbrack HCOOH\rbrack}[/tex]We clear (H3O+) and we apply -log and we get this:
[tex]pH\text{ = }pKa+log(\frac{[HCOO^-]}{[HCOOH]})[/tex][tex]pH=3.77+log(\frac{[0.52]}{[0.30]})\text{ }[/tex]Answer: pH = 4.01
--------------------------------------------------------------------------------------------------
pOH)
pH + pOH = 14
(This formula appears from the ionic equilibrium of water)
pOH = 14 - 4.01 = 9.99
Answer: pOH= 9.99
--------------------------------------------------------------------------------------------------
You heat 3.939 g of a mixture of Fe3O4 and FeO to form 4.197 g Fe2O3. The mass of oxygen reacted is
Explanation:
A mixture of differet iron oxides is heated and they it absorbs oxygen from the air to form iron (II) oxide. The reaction can be represented like this:
2 Fe₃O₄ + 2 FeO + O₂ ----> 4 Fe₂O₃
The mass of the mixture of Iron oxides is 3.939 g. The mass of Fe₂O₃ formed is greater than the original mass, it is 4.197 g. That means that the sample absorbed oxygen.
mass of Fe₃O₄ + mass of FeO = 3.939 g
mass of Fe₂O₃ = 4.197 g
The law of conservation of mass states that no mass is loss or created in a chemical reaction. A mass balance can be written:
mass of Fe₃O₄ + mass of FeO + mass of O₂ = mass of Fe₂O₃
The known values can be replaced in the equation, and it can be solved for mass of O₂ to obtain the answer to the problem.
mass of Fe₃O₄ + mass of FeO + mass of O₂ = mass of Fe₂O₃
mass of O₂ = mass of Fe₂O₃ - (mass of Fe₃O₄ + mass of FeO)
mass of O₂ = 4.197 g - 3.939 g
mass of O₂ = 0.258 g
Answer: the mass of oxygen reacted is 0.258 g
Write the correct formula for the following compound:
zinc phosphate
The correct formula of zinc phosphate is Zn₃(PO₄)₂.
What is chemical formula?Chemical formula is a notation indicating the number of atoms of each element present in a compound.
The chemical or molecular formula shows the type of atoms of an element in a chemical compound and the number of each atoms in the element.
Zinc phosphate is a compound that possess the following elements:
Zinc (Zn)Phosphorus (P)Oxygen (O)This means that the chemical formula of zinc phosphate will show the number of atoms of zinc, phosphorus and oxygen present in the compound.
Therefore, this means that the chemical formula of the compound is Zn₃(PO₄)₂.
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Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
[] → CH3,CH3,(g) +O2,(g) → CO2,(g) + H2O(g)
[tex]$$\mathrm{CH}_3 \mathrm{CH}_3(y)+\mathrm{O}_2(q) \rightarrow \mathrm{CO}_2(q)+\mathrm{H}_2 \mathrm{O}(\text { I })$$[/tex]
[tex]\begin{tabular}{l|l}$C=2$ & $C=1$ \\$H=6$ & $H=2$ \\$O=2$ & $0=3$\end{tabular}[/tex]
First balance carbon then balms oxygen and followed by hydrogen through adding odd number Infront of the reactant and product.
[tex]$$2\mathrm{CH}_3 \mathrm{CH}_3(y)+7\mathrm{O}_2(q) \rightarrow 4\mathrm{CO}_2(q)+6\mathrm{H}_2 \mathrm{O}(\text { I })$$[/tex]
[tex]\begin{tabular}{l|l}$C=4$ & $C=4$ \\$H=12$ & $H=12$ \\$O=14$ & $0=14$\end{tabular}[/tex]
What is stoichiometric coefficients?Stoichiometry as the calculation of products and reactants in a chemical response. It is fundamentally concerned with numbers. Stoichiometry is an critical concept in chemistry that makes a difference us utilize adjusted chemical conditions to calculate sums of reactants and products. Here, we make utilize of proportions from the adjusted condition. In common, all the responses that take put are subordinate on one primary figure, how much substance is present. Stoichiometry makes a difference us determine how much substance is required or is present.
Stoichiometry helps us determine
Reactants Products mass Molecular weight Chemical equations Formula.To learn more about stoichiometric coefficients, refer;
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What is the hydrogen ion and hydroxide ion concentration for a pH of 4.478? Is the solution acid or base?
Answer
The hydrogen ion concentration, [H⁺] is 3.327 x 10⁻⁵ M
The hydroxide ion concentration [OH⁻] is 3.01 x 10⁻¹⁰ M
The solution is acid.
Explanation
pH is a measure of how acidic or basic a solution is. The range goes from 0 - 14, with 7 being neutral. A pH of less than 7 indicates acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the solution.
Since pH of the solution is 4.478, then it means the solution is acid.
The hydrogen ion concentration, [H⁺] of the solution can be calculated using the pH formula.
[tex]pH=-log[H^+][/tex]Substituting pH as 4.478 into the formula, we have
[tex]\begin{gathered} 4.478=-log[H^+] \\ \\ Multiply\text{ }through\text{ }by\text{ }minus\text{ }(-) \\ \\ log[H^+]=-4.478 \\ \\ .[H^+]=10^{-4.478} \\ \\ .[H^+]=3.327\times10^{-5}\text{ }M \end{gathered}[/tex]The hydrogen ion concentration, [H⁺] is 3.327 x 10⁻⁵ M
The relation between the hydrogen ion concentration, [H⁺] and hydroxide ion concentration [OH⁻] is
[tex].[H^+]\times[OH^-]=10^{-14}[/tex]So, substituting [H⁺] as 3.327 x 10⁻⁵ M, we have:
[tex]\begin{gathered} 3.327\times10^{-5}\times[OH^-]=10^{-14} \\ \\ Divide\text{ }both\text{ }sides\text{ }by\text{ }3.327\times10^{-5} \\ \\ \frac{3.327\times10^{-5}\times\times[OH^-]}{3.327\times10^{-5}}=\frac{10^{-14}}{3.327\times10^{-5}} \\ \\ .[OH^-]=3.01\times10^{-10}\text{ }M \end{gathered}[/tex]Hence, the hydroxide ion concentration [OH⁻] is 3.01 x 10⁻¹⁰ M
Name the following compoundCH3-CH-CH2-CH3 | Br
2 brome butane
it has 4 C atoms therefor we know it is a butan-- and the brome is placed in the second carbone so that gives the answer 2 brome butane
7. The average human can hold 4.0 L of oxygen (O₂) in their lungs. At body temperature (37 °C) and 110 kPa, how manymoles of gas is that?
Answer
number of moles = 0.171 mol
Explanation
Given
Volume of oxygen = 4.0 L
Temperature = 37 °C = 310 K
Pressure = 110 kPa = 1.08562 atm
we know R = 0.082 L.atm.k/mol
Required: number of moles
Solution
To solve this problem, use the ideal gas law
PV = nRT
n = PV/RT
n = (1.08562 x 4.0 L)/(0.082 L.atm.k/mol x 310 K)
n = 0.171 mol
Explain how you would calculate the total change in bond energy for the reaction H₂ + Cl₂ → 2HCI. How would you know if the reaction was endothermic or exothermic? State your answer in 3-5
Answer:
The total change in energy is -183 kJ/mol, and the reaction is exothermic.
Explanation:
1st) To calculate the total change in bond energy, it is necessary to calculate the energy of the broken bonds (in the reactants side) and the energy of the formed bonds (in the products side):
• Energy of broken bonds:
H-H: 1 x 432 = 432 kJ/mol
Cl-Cl: 1 x 239 = 239 kJ/mol
Total energy of broken bonds = 432 kJ/mol + 239 kJ/mol
Total energy of broken bonds = 671 kJ/mol
• Energy of formed bonds:
H-Cl: 2 x 427 = 854 kJ/mol
Total energy of formed bonds = 854 kJ/mol
2nd) Now to calculate the total change in bond energy, we have to subtract the Total energy of broken bonds minus the total energy of the formed bonds:
Total change in energy = Total energy of broken bonds - Total energy of formed bonds
Total change in energy = 671 kJ/mol - 854 kJ/mol
Total change in energy = -183 kJ/mol
Finally, the total change in energy is -183 kJ/mol, and the negative sign means that the reaction is exothermic, because
Answer: The total change of the energy is -183 kJ/mol
Explanation:
The way I would calculate the total change in the bond energy in the following steps:
- To calculate the whole change in the bond energy. By calculating the energies of the broken bonds and then the energy of the formed bonds.
-132 kJ/mol + 239 kJ/mol = a total of 671 kJ/mol broken bonds.
-H-CI: 2 x 427 = 854 kJ/mol
-Second to calculate the change in the bond energy we now need to subtract the total energy of the broken bond from the total energy of the formed bonds.
-Change in energy = 671 kJ/mol - 854 kJ.mol
-The total change of the energy is -183 kJ/
- Having the negative, therefore, means the reaction is exothermic.
What are two ways we can calculate volume described them in depth and why would you use one method over another explain
The volume can be measured by the displacement method and by the use of dimensions.
What is volume?The term volume has to do with the space that is occupied by a substance. Thus we know that a solid has a definite volume and a definite shape while a liquid has a definite volume but does not have a definite shape. On the other hand, the gases does not have a definite shape or a definite volume.
In this case, we are staying with the volume of a solid object because this is what have been implied by the question that we have before us here.
There are two ways that we can use to obtain the volume of an object and these two methods are;
1) By calculation: In this method, the dimensions of the object is measured and the volume of the object can be obtained from the dimensions of the object.
2) By displacement method: This involves a situation, in which a give volume of water is measured and then the object is added and the volume of the water that is displaced is measured and then taken as the volume of the object.
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How many coulombs of charge are needed to produce 53.5 mol of solid zinc?
The charge of 10,325,500 coulombs is needed to produce 53.5 mol of solid zinc.
What is the coulomb charge?The coulomb is the unit of electric charge in the International System of units and is represented by 'C'. In the S.I., it is equal to the electric charge delivered by a 1-ampere constant current in 1 second and to elementary charges, about 6.2×10¹⁸ e.
The coulomb in terms of the ampere and second can be described as 1 C = 1 A × 1 s. The SI base units fixed the numerical value of the elementary charge expressed in coulombs.
Solid zinc can be formed by chemical reactions:
Zn²⁺ + 2e⁻ → Zn (s)
One mole of zinc is produced by using two moles of electrons.
One mole of electrons is equal to one faraday electricity.
Then, the total electrons required = 2×53.5 = 107 F
The charge (in coulombs) on one mole of electrons = 96500 C
Amount of charge required to form zinc = 96500 × 107 = 10,325,500 C
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predict the product of this combination reaction. Include thephysical state of the product and balance the reaction. Hint: You have aluminumand sulfide ions in your product. What are the charges of those ions? How wouldyou write the formula so that the charges cancel?
We are asked to predict a reaction having two solids as reactants. The reaction occurs in the solid phase. Initially the elements are in their natural state, so they will have an oxidation state equal to 0.
This is a combination reaction, so the product will be a combination of aluminum and sulfur.
When combined, aluminum has an oxidation state of +3, this means that it gives up its electrons. Sulfur has an oxidation state of -2. The resulting product will be aluminum sulfide (Al2O3). so, the reaction will be:
[tex]Al_{(s)}+S_{8(s)}\rightarrow Al_2^{+3}S_3^{-2}[/tex]We must balance the equation.
Let's start with sulfur. We multiply each sulfur-containing molecule by its opposite. In other words, we multiply the S8 molecule by 3 and we multiply the S3 molecule by 8.
And to balance the aluminum we must multiply the aluminum molecule by 16. So, the balanced equation will be:
[tex]16Al_{(s)}+3S_{8(s)}\rightarrow8Al_2^{+3}S_{3(s)}^2[/tex]So, the answer, in summary, will be:
We obtain a product with the formula Al2O3. Al is an ion with a charge of +3, and S is an ion with a charge of -2.
There are 4 moles of methane burned to produce how many moles of water? CH4+2O2=CO2+2H2O
ANSWER
8 moles of water
EXPLANATION
The major products formed when an organic compound undergo combustion reaction are water and carbon dioxide
Below is the combustion formula
[tex]\text{ C}_xH_y\text{ + x + }\frac{y}{4}O_2\text{ }\rightarrow\text{ xCO}_2\text{ + }\frac{y}{2}H_2O[/tex]In the question above, 4 moles of methane reacts with oxygen
[tex]\begin{gathered} \text{ 4CH}_4\text{ + 4+}\frac{16}{4}O_2\text{ }\rightarrow\text{ 4CO}_2\text{ + }\frac{16}{2}H_2O \\ \\ \text{ 4CH}_{4(g)}\text{ + 8O}_{2(g)}\text{ }\rightarrow\text{ 4CO}_{2(g)}\text{ + 8H}_2O(l) \end{gathered}[/tex]Therefore, 4 moles of methane will give 8 moles of water
5
Select the correct answer from each drop-down menu.
Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down
A solid
A liquid
Agas
a definite volume and
a definite volume and
V a definite volume and
a definite shape.
a definite shape.
a definite shape.
Reset
Next
A solid has an identifiable shape and volume. A liquid has a fixed volume and an ill-defined shape. A gas has an undefined shape and a fixed volume.
Which statement regarding solids, liquids, and gases is accurate?A solid is something that has a specific shape and volume. The definition of a liquid is something that has a fixed volume but no fixed shape. A gas is described as something that has neither a fixed shape nor a fixed volume.
What are the solid, liquid, and gas elements' four characteristics?A solid has a distinct volume and shape, a liquid has a distinct volume but no distinct shape, and a gas lacks both.
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explain absolute entropies and it's determination in terms of heat capacity
The total entropy that a pure material would accumulate upon warming from absolute zero (where S=0) to the specific temperature is the absolute entropy of that substance at that temperature.
What is entropy?
One of the key ideas that students studying physics and chemistry need to grasp with clarity is entropy. More importantly, entropy has multiple definitions and can be used in a variety of contexts, including the thermodynamic stage, cosmology, and even economics. Entropy is a notion that mostly discusses the spontaneous changes that take place in commonplace phenomena or the universe's propensity for chaos.
Determination in terms of heat capacity
The third rule of thermodynamics has two significant ramifications: it establishes a constant reference point that enables us to measure the absolute entropy of any substance at any temperature, and it specifies the sign of the entropy of any substance at temperatures above absolute zero as positive. We look at two different approaches to calculating S for a reaction or a physical change in this section.
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11) A sample of carbon dioxide has a volume of 26 mL at 11 °C and 623 torr. How many grams of CO2 are in the sample?
Explanation:
We have a gas sample of carbon dioxide and we know its volume, the pressure and the temperature. We can find the number of moles of that sample using the ideal gas law.
P * V = n * R * T
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas law and T is the temperature.
R = 0.082 atm*L/(mol*K)
Since R is in atm*L/(mol*K) we have to convert the volume from mL to L, the temperature from °C to K and the pressure from torr to atm.
1000 mL = 1 L
V = 26 mL = 26 mL * 1 L/(1000 mL)
V = 0.026 L
760 torr = 1 atm
P = 623 torr = 623 torr * 1 atm/(760 torr)
P = 0.820 atm
T = (273.15 + 11 ) K
T = 284.15 K
Now we can replace these values in the formula and solve it for n to find the number of moles that are present in the sample.
P * V = n * R * T
n = P * V/(R * T)
n = 0.820 atm * 0.026 L/(0.082 atm*L/(mol*K) * 284.15 K)
n = 0.000915 mol
Finally we can convert the moles of the sample into grams using the molar mass of carbon dioxide.
molar mass of C = 12.01 g/mol
molar mass of O = 16.00 g/mol
molar mass of CO₂ = 1 * 12.01 g/mol + 2 * 16.00 g/mol
molar mass of CO₂ = 44.01 g/mol
mass of CO₂ = 0.000915 mol * 44.01 g/mo
mass of CO₂ = 0.040 g
Answer: There are 0.040 g of carbon dioxide in the sample.
what is the pH of a neutral solution? a.10 b. 7c. 14 d. 0
According to the pH scale, the pH can range from 0 to 14, and the lower the pH, the more acidic the solution is, the same goes if the pH is higher, the solution will be basic. These two informations are based on the neutral value of pH, which is 7. Letter B is the answer
Which of the following statements about effective nuclear charge is true?
Electrons in the same shell screen each other much more than those in core shells.
The valence electrons are very effective in screening the core electrons from the full charge of
the nucleus.
The effective nuclear charge experienced by valence electrons increases as we move right to
left across a period.
The effective nuclear charge experienced by valence electrons increases as we move left to
right across a period.
The valence electrons are very effective in screening the core electrons from the full charge of the nucleus statements about effective nuclear charge is true
Effective nuclear charge: What is it?The attractive positive charge of nuclear protons acting on valence electrons is known as effective nuclear charge. Due to the shielding effect, the effective nuclear charge is always smaller than the total amount of protons in a nucleus. In comparison to all other periodic table trends, effective nuclear charge lags behind.
Although a fluorine atom's nucleus has a 9-volt charge Z, the core electrons—four from the 1s and 2s orbitals—and some of the 7 electrons in the 2p orbitals—screen the valence electrons noticeably. Therefore, the cation of sodium has the highest effective nuclear charge.
Effective nuclear charge lowers down a group and rises from left to right across a period in the periodic table.
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Can you help show me the conversion works for this problem in my online homework please?
There are 2.04*10^-4 moles of hydrogen.
To start the calculation it is necessary to use the molar mass of glycine:
- Glycine molar mass: 75.08 g/mol.
From the formula of glycine, we know that in 75.08g of glycine, there are 5 moles of hydrogen. So, in 3.06*10^-3g of glycine will be another amount of hydrogen, and we can calculate it with a mthematical Rule of Three:
[tex]\begin{gathered} 75.08\text{gGlycine}-5\text{molHydrogen} \\ 3.06\cdot10^{-3}\text{gGlycine}-x=\frac{3.06\cdot10^{-3}\text{gGlycine}\cdot5\text{molHydrogen}}{75.08\text{gGlycine}} \\ x=2.04\cdot10^{-4}\text{molHydrogen} \end{gathered}[/tex]So, there are 2.04*10^-4 moles of hydrogen in 3.06*10^-3g of glycine.
There are 215.0 mol of an unknown gas stored at a temperature of 1110 K in a large, 395 L container. R=0.0821 L·atm/(mol·K) In atm, what is the approximate pressure of the gas?
Answer:
To solve this problem we use the ideal gas equation:
[tex]P.V=n.R.T[/tex]Where:
P is the pressure of the gas
V is the volume of the container (395 L)
n is the number of moles present (215 mol)
R is the ideal gas constant (0.0821 L.atm/mol.K)
T is the temperature of the gas (1110 K)
So to calculate the pressuere we have to use the equation and the data:
[tex]\begin{gathered} P=\frac{n.R.T}{V} \\ P=\frac{215mol\text{ . }0.0821\frac{L.atm}{mol.K}\text{ . }1110K}{395L} \\ P=\text{ 49.6 atm} \end{gathered}[/tex]So the answer is 49.6 atm.
Some cracker tins include a glass vial of drying material in the lid to keep the crackers crisp. In many cases, the material is a mixture of magnesium sulfate and cobalt chloride indicators. As the magnesium sulfate absorbs moisture (MgSO4 ∙ H2O + 6H2O MgSO4 ∙ 7H2O), the indicator changes color from blue to pink (CoCl2 ∙ 4H2O + 2H2O CoCl2 ∙ 6H2O). When this drying mixture becomes totally pink, it can be restored if it is heated in an oven. What two changes are caused by the heating?
The two indicators given are there to absorb water or moisture. So when the indicator is totally pink it means it has been used to its total potential.
By heating the indicator, this can evaporate the water from the indicator, thus restoring it. This means that the indicator will go back to its blue color and it can be re-used.
So the two changes caused by heating:
1. Indicator changes color back to blue.
2. Water is evaporated from the indicator.
What wavelength (in nm) of light is emitted when an electron transitions from the n
= 8 to the n = 2 state?
The wavelength in nm of light emitted when an electron transitions from n = 8 to n = 2 state is 38900nm.
It is given that the electron transition took place from n = 8 to n = 2. To find the wavelength, the following formula is to be used:
1/λ = R(1/n²₁ - 1/n²₂)
Here, n₁ = 2 n₂ = 8 and R = 109677. Therefore,
1/λ = 109677(1/2² - 1/8²)
1/λ = 109677(1/4 - 1/64)
1/λ = 109677((16-1)/64)
1/λ = 109677((15)/64)
1/λ = 0.234375 x 109677
1/λ = 25,705.5469
λ = 1/25,705.5469
λ = 3.89 x 10⁻⁵cm
λ = 38900 x 10⁻⁹m
λ = 38900nm
Therefore, the wavelength in nm from n=8 to n=2 transition is 38900nm
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A student dissolves a white crystalline solid substance in water to form a solution. When a conductivity meter is immersed in the solution, the reading recorded was 35.80 mSiemens/cm. Which of the following compounds could be the solute in this solution?
ANSWER
STEP-BY-STEP EXPLANATION