Answer:
Explanation:
convert to grams
0.133 mol C x 12 = 1.596
0.267 mol H x 1 = 0.267
Now subtract those numbers from the 4.00
4.00-1.596 -0.267 = 2.137 g O
Now convert grams O to moles
2.137 x (1mole O/16 g O) =0.1335625 moles O
3 sig figs = 0.134 moles O
A bottle of nail polish remover containing ethyl acetate was spilled in an unventilated room measuring 9.00 m × 6.00 m × 3.00 m. After some time had passed, it was determined that 8.701 g of ethyl acetate had evaporated. Calculate the concentration of ethyl acetate in milligrams per cubic meter.
Answer:
53.69 mg/m³
Explanation:
To calculate the concentration of ethyl acetate in milligrams per cubic meter, we need to know the total volume of the room and the amount of ethyl acetate that evaporated in grams.
The total volume of the room is:
V = l x w x h
V = 9.00 m x 6.00 m x 3.00 m
V = 162.00 cubic meters
To convert the amount of ethyl acetate evaporated from grams to milligrams, we multiply by 1000:
amount of ethyl acetate = 8.701 g = 8,701 mg
Now we can calculate the concentration of ethyl acetate in milligrams per cubic meter:
concentration = amount of ethyl acetate / volume of room
concentration = 8,701 mg / 162.00 cubic meters
concentration = 53.69 mg/m³
Therefore, the concentration of ethyl acetate in the unventilated room is 53.69 mg/m³.
NEED HELP ASAP PLS AND THX PIC IS ATTACHED
Label each of the three parts of this process with a brief description of what the part shows.
The three parts are:
Substrate: The reactants that bind to the enzyme are called substrates. These are the molecules that are acted upon by the enzyme.Enzyme-substrate complex: The complex formed when the substrate binds to the active site of the enzyme. This complex helps to break bonds in the reactants and form new bonds, changing the substrates into products.Product: The end result of the enzyme-catalyzed reaction, formed after the enzyme releases the products.What is the enzymes about?This passage describes the role of enzymes in biological processes. Enzymes are protein molecules that act as catalysts, speeding up chemical reactions without being used up or changed in the process. They do this by binding to specific reactant molecules, called substrates, at a specific site on the enzyme molecule called the active site.
Only substrates that are shaped to fit the active site can bind to the enzyme. When the enzyme and substrate bind together, they form an enzyme-substrate complex, which helps to break bonds in the substrate molecules and form new bonds, resulting in the formation of products.
Therefore, The enzyme then releases the products and is free to bind with other substrates and repeat the process. The passage also notes that enzymes are important in cell processes that supply energy and that their activity can be affected by factors such as pH and temperature.
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See text below
reactions in the body. Like all catalysts, enzymes
up by the chemical reaction. They can be used again. Also, most enzymes act in just one type of reaction. For example, the enzyme amylase is found in saliva. Amylase helps begin the process of food digestion in the mouth.
The figure below shows how an enzyme works. The reactants that bind to the enzyme are called substrates. The specific location where a substrate binds on an enzyme is called the active site. The substrate and active site are shaped to fit together exactly. Only substrates shaped to fit the active site will bind to the enzyme.
The bond between the enzyme and substrates creates the enzyme-substrate complex. This complex helps to break bonds in the reactants and form new bonds, changing the substrates into products. The enzyme then releases the products.
Enzymes are the chemical workers in cells. The actions of enzymes enable cell processes that supply energy. Factors such as pH and temperature affect enzyme activity.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Substrate
Active sites
Substrate Enzyme
Biology online biologygmh.com
Product
Enzyme-substrate complex
Product
Chap
Pi
4
Which of the following are the products and reactants of a chemical reaction most likely to have in common?
1. Atoms
2. Molecules
3. Chemical properties
Answer:
1. Atoms
Explanation:
The products and reactants of a chemical reaction are usually related in terms of their atoms and molecules. During a chemical reaction, atoms are rearranged to form new molecules, and these new molecules are the products of the reaction. However, the atoms themselves are not created or destroyed in the process.
For example, if we consider the combustion of methane (CH4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), the reactants (methane and oxygen) and the products (carbon dioxide and water) are all made up of the same types of atoms (carbon, hydrogen, and oxygen), but they are rearranged in different ways. The chemical properties of the reactants and products may differ, but they are still related in terms of their atomic and molecular composition.
It's difficult though to say which is more likely between atoms and molecules because they are both essential components of chemical reactions. In a chemical reaction, atoms combine to form molecules or break apart from molecules to form new molecules. Therefore, both atoms and molecules are important in a chemical reaction.
However, if we had to choose one that is more likely to be common between the reactants and products, it would probably be atoms. This is because in most chemical reactions, the atoms involved in the reactants are rearranged to form the products. The chemical reaction simply involves the rearrangement of the atoms, but the atoms themselves are not created or destroyed
On the other hand, molecules may change significantly during a chemical reaction, as they are made up of specific arrangements of atoms. The chemical properties of the reactants and products may also differ because of changes in the molecular structure. Therefore, while molecules are still an essential part of chemical reactions, it is more likely that atoms will be common between the reactants and products.
How old is H2O or water?
4.5 billion years old
hope this helps
Answer:
Earth's water is 4.5 billion years old.
Explanation:
Water is a transparent, odorless, tasteless liquid, a compound of hydrogen and oxygen, H2O, freezing at 32°F or 0°C and boiling at 212°F or 100°C, that in a more or less impure constitutes rain, oceans, lakes, rivers, etc.: it contains 11.188 percent hydrogen and 88.812 percent oxygen, by weight.
Alexander, who weighs 180 lb , decides to climb Mt. Krumpett, which is 5620 m
high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100-g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates. One gram of fat contains 9 Calories, whereas each gram of protein and carbohydrates contains 4 Calories.
To determine how much food to bring, Alexander will need to take into account the energy required to climb the mountain. Gravitational potential energy is the energy stored in an object that is raised to a height. The gravitational potential energy is related to an object's mass m, the height h to which it is raised, and the acceleration due to gravity, g. The relationship is given by E=m⋅g⋅h
The value of g near Earth's surface is 9.81m/s2.
Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?
Answer: Brainlest Please!
Explanation:
To determine how many bars Alexander should pack, we first need to calculate the energy required for the uphill climb and the return trip. We can use the formula for gravitational potential energy to calculate this:
Energy required = m * g * h
where m is the mass of Alexander and his backpack, g is the acceleration due to gravity, and h is the height of the mountain.
First, we need to convert Alexander's weight from pounds to kilograms:
180 lb * (1 kg / 2.205 lb) = 81.65 kg
Assuming Alexander's backpack weighs 10 kg, his total mass is:
m = 81.65 kg + 10 kg = 91.65 kg
Next, we need to convert the height of the mountain from meters to joules:
5620 m * 91.65 kg * 9.81 m/s^2 = 5,029,669 J
Since Alexander assumes he will need as much energy for the return trip, the total energy required is:
2 * 5,029,669 J = 10,059,338 J
Now, we can calculate the number of bars required to provide this amount of energy.
Each bar weighs 100 g, and contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.
First, we need to calculate the total energy per bar:
10 g of fat * 9 Cal/g + 40 g of protein * 4 Cal/g + 50 g of carbohydrates * 4 Cal/g = 410 Cal
Next, we can calculate the number of bars required:
10,059,338 J * (1 Cal / 4.184 J) * (1 bar / 410 Cal) = 605 bars
Therefore, Alexander should pack approximately 605 nutrition bars for his trip up and down Mt. Krumpett.
A calorimeter contains 21.0 mL of water at 13.5 ∘C. When 1.70g of X (a substance with a molar mass of 77.0 g/mol) is added, it dissolves via the reaction X(s)+H2O(l)→X(aq) and the temperature of the solution increases to 25.0 ∘C.
Calculate the enthalpy change, ΔH , for this reaction per mole of X.
Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g⋅∘C)], that density of water is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings.
Express the change in enthalpy in kilojoules per mole to three significant figures.
Enthalpy change, H, for this reaction per mole of X is thus equal to 0 J/mol.
How can the water's temperature in the calorimeter be determined?The amount of heat that the calorimeter, q cal, gains may be calculated using the formula qcal = Ccalt, where t is the change in temperature that the mixture experiences.
The equation: can be used to compute the enthalpy change, H. ΔH = q / n
The heat absorbed by the water can be calculated using the equation:
q1 = m1 x c1 x ΔT1
m1 = 21.0 g = 0.0210 kg (since the density of water is 1.00 g/mL)
c1 = 4.18 J/(g⋅∘C)
ΔT1 = 25.0 ∘C - 13.5 ∘C = 11.5 ∘C
q1 = (0.0210 kg) x (4.18 J/(g⋅∘C)) x (11.5 ∘C) = 1.09 J
The heat absorbed by X can be calculated using the equation:
q2 = m2 x ΔHfus
where m2 is the mass of X and ΔHfus is the enthalpy of fusion of X.
m2 = 1.70 g = 0.00170 kg
ΔHfus = ΔH / n = ΔH / (m2/M)
where M is the molar mass of X.
We can rearrange this equation to solve for ΔH: ΔH = q2 x (m2/M)
With this assumption, we can calculate ΔH as follows:
ΔH = q / n = (q1 + q2) / n
ΔH = (1.09 J + q2) / (0.00170 kg / 77.0 g/mol)
ΔH = (1.09 J + q2) / 0.0000221 mol
The fact that the heat absorbed by X is equal to the heat emitted by the solution can be used to solve for q2: q2 = -q1
Therefore, ΔH = (1.09 J - q1) / 0.0000221 mol
Substituting q1, we get:
ΔH = (1.09 J - 1.09 J) / 0.0000221 mol
ΔH = 0 J/mol
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. Using appropriate illustrations, explain how structural factors affect the reaction outcome in
conjugate addition reactions.
Nucleophilic addition that targets the C=C double bond's electrophilic carbon is known as conjugate addition in,-unsaturated systems.
What kind of response is that?Changes in temperature, gas production, precipitant formation, and color are common components of chemical reactions. Cooking, digesting, and combustion are a few straightforward examples of common reactions.
What exactly is a chemical reaction?When atoms' chemical bonds are established or ruptured, chemical processes take place. The materials that initiate a chemical change are known as reactants, while the materials created as a result of the reaction as known as products.
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Problem 1. What masses of 15% and 20% solutions are needed to prepare 200 g of 17% solution?
Problem 2. What masses of 18% and 5% solutions are needed to prepare 300 g of 7% solution?
Problem 3. 200 g of 15% and 350 g of 20% solutions were mixed. Calculate mass percentage of final solution.
Problem 4. 300 g of 15% solution and 35 g of solute were mixed. Calculate mass percentage of final solution.
Problem 5. 400 g of 25% solution and 150 g of water were mixed. Calculate mass percentage of final solution.
For each problem:
Masses of solution needed are 80 g and 120 g respectively.Masses of solution needed are 120 g and 180 g respectively.Mass percentage of final solution is 22.7%.Mass percentage of final solution is 23.9%Mass percentage of final solution is 18.2%.How to calculate mass and mass percentage?Problem 1:
Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.
We have two equations:
x + y = 200 (total mass of the solution)
0.15x + 0.20y = 0.17(200) (total amount of solute in the solution)
Solving these equations:
x = 80 g (mass of 15% solution needed)
y = 120 g (mass of 20% solution needed)
Therefore, 80 g of 15% solution and 120 g of 20% solution need to be mixed to prepare 200 g of 17% solution.
Problem 2:
Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.
We have two equations:
x + y = 300 (total mass of the solution)
0.18x + 0.05y = 0.07(300) (total amount of solute in the solution)
Solving these equations:
x = 120 g (mass of 18% solution needed)
y = 180 g (mass of 5% solution needed)
Therefore, 120 g of 18% solution and 180 g of 5% solution need to be mixed to prepare 300 g of 7% solution.
Problem 3:
Let x be the mass of the final solution.
The total amount of solute in the final solution is:
0.15(200 g) + 0.20(350 g) = 55 g + 70 g = 125 g
The total mass of the final solution is:
200 g + 350 g = 550 g
Therefore, the mass percentage of the final solution is:
(125 g / 550 g) x 100% = 22.7%
Problem 4:
Let x be the mass of the final solution.
The total amount of solute in the final solution is:
0.15(300 g) + 35 g = 80 g
The total mass of the final solution is:
300 g + 35 g = 335 g
Therefore, the mass percentage of the final solution is:
(80 g / 335 g) x 100% = 23.9%
Problem 5:
Let x be the mass of the final solution.
The total amount of solute in the final solution is:
0.25(400 g) = 100 g
The total mass of the final solution is:
400 g + 150 g = 550 g
Therefore, the mass percentage of the final solution is:
(100 g / 550 g) x 100% = 18.2%
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What is the percent of Ca in
Ca(C2H3O2)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
[?] % Ca
Answer:
25.3%
Explanation:
Since
Ca has just 1 mole
Ca ×1 = 40.08
C has 4 moles
C×4 = 48.04
H has 6 moles
H×6 = 6.06
O has 4 moles
O×4 = 64
64+6.06+48.04+40.08=158 (approx.)
40.08÷158 ×100% = 25.3%
1.Explain the Theory of Plate Tectonics and provide three observations about the earth
that provide evidence to support the theory. Describe how plate tectonics cause
major geological events such as ocean basins, earthquakes, and volcanic eruptions.
Be sure to:
• Use science terms appropriately
.
• Organize and develop your ideas effectively
• Choose your words carefully
.
• Edit your writing for grammar, mechanics, and spelling
The Theory of Plate Tectonics is a scientific theory that explains how the Earth's outer shell is composed of several large plates that move and interact with each other over time.
What is the theory of plate tectonics?Three observations about the Earth that provide evidence to support the Theory of Plate Tectonics are:
Earthquakes: Earthquakes occur when the movement and interaction of the tectonic plates cause rocks to fracture and shift. These seismic events are most common along the boundaries of the tectonic plates, where the movement and interaction are most pronounced. The distribution of earthquakes around the world is consistent with the theory of plate tectonics.
Volcanic Activity: Volcanic activity is closely related to the movement of tectonic plates. Many of the world's most active and well-known volcanoes are located near plate boundaries, where the movement and interaction of plates lead to the formation of magma chambers and the release of volcanic material. This relationship between volcanoes and plate boundaries supports the theory of plate tectonics.
Continental Drift: The theory of plate tectonics also explains the phenomenon of continental drift, which refers to the movement of the Earth's continents over time. According to this theory, the continents are part of the tectonic plates and have moved and shifted over millions of years. The fit of the coastlines of Africa and South America is a well-known example of continental drift and supports the theory of plate tectonics.
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After addition of 20.00 mL of 0.500 M standard KOH solution to 10.00 mL of formic acid (HCOOH, Ka = 1.8 × 10-4), the equivalence point is reached. What is the molarity of the formic acid?
What is the pH at the equivalence point, based on the question above? Please make a suggestion for an appropriate indicator.
Answer: 3.79
Explanation: The balanced chemical equation for the reaction between formic acid (HCOOH) and KOH is:
HCOOH + KOH → HCOOK + H2O
We can use the stoichiometry of this reaction to calculate the number of moles of formic acid that reacted with the KOH:
moles of KOH = (20.00 mL)(0.500 mol/L) = 0.01000 moles
moles of HCOOH = moles of KOH
Therefore, the initial number of moles of formic acid is:
moles of HCOOH = (10.00 mL)(x mol/L) = 0.01000 moles
where x is the molarity of formic acid.
Solving for x, we get:
x = 1.00 M
Therefore, the molarity of the formic acid is 1.00 M.
At the equivalence point, all of the formic acid has reacted with the KOH, and the solution contains only the salt formed by the reaction, potassium formate (HCOOK). The pH at the equivalence point can be calculated using the equation for the salt hydrolysis constant:
Kb = Kw/Ka
where Kb is the base dissociation constant of the conjugate base (formate ion), Kw is the ion product constant for water (1.0 × 10^-14 at 25°C), and Ka is the acid dissociation constant of the acid (formic acid). Rearranging this equation, we get:
Kb/Ka = [OH^-][HCOO^-]/[HCOOH]
At the equivalence point, the concentration of the formate ion (HCOO^-) is equal to the concentration of the KOH added (0.01000 moles / 30.00 mL = 0.3333 M). We can assume that the concentration of the hydroxide ion (OH^-) is also equal to 0.3333 M, since KOH is a strong base and will dissociate completely. Substituting these values into the equation above, we get:
Kb/Ka = (0.3333)^2 / [HCOOH]
Solving for [HCOOH], we get:
[HCOOH] = (0.3333)^2 / (1.8 × 10^-4) = 6181.5 M
Taking the negative logarithm of this concentration, we get the pH at the equivalence point:
pH = -log[HCOOH] = -log(6181.5) = 3.79
Therefore, the pH at the equivalence point is 3.79.
Regenerate response
Please help almost due?
Answer:
-lithium
-atomic number
-mass number
-protons
Explanation:
Write a balanced chemical equation for the reaction between aqueous hydrogen ion, H+, and aqueous hydroxide ion, OH+
H+ (aq) + OH- (aq) → H2O (l)
For the following chemical reaction:
In the laboratory, a chemist mixed aqueous barium chloride with aqueous potassium oxide which produced solid barium oxide and aqueous potassium chloride
A. Write the complete balanced chemical equation, including phase labels.
B. Identify the type of reaction that has occurred.
C. Identify the indicator that tells you a chemical reaction has occurred.
Answer:
A. The complete balanced chemical equation, including phase labels, for the reaction is:
BaCl2 (aq) + K2O (aq) → BaO (s) + 2KCl (aq)
B. The type of reaction that has occurred is a double displacement or metathesis reaction. In this reaction, the barium cations (Ba2+) and potassium anions (K+) exchange partners, resulting in the formation of solid barium oxide (BaO) and aqueous potassium chloride (KCl).
C. The indicator that tells you a chemical reaction has occurred is the formation of a solid precipitate. In this reaction, the solid barium oxide (BaO) that forms is a clear indication that a chemical reaction has occurred. Additionally, the fact that the reactants are aqueous and the products include both a solid and an aqueous solution also indicates a chemical reaction has taken place.
What is the total number of moles of reactants and products in the
chemical reaction listed below:
2 H₂S +30₂2 H₂O + 2 SO₂
The total number of moles of reactants and products in the chemical reaction given is 9 moles
How do i determine the total number of moles?The total number of mole of reactants and products in the chemical reaction can be obtained as follow:
2H₂S + 3O₂ -> 2H₂O + 2SO₂
The following were obtained from the above equation:
Mole of H₂S = 2 molesMole of O₂ = 3 molesMole of H₂O = 2 molesMole of SO₂ = 2 molesMole of reactants = Mole of (H₂S + O₂) = 2 + 3 = 5 molesMole of products = Mole of (H₂O + SO₂) = 2 + 2 = 4 molesTotal number of moles =?Total number of mole = Mole of reactants + mole of products
Total number of mole = 5 mole + 4 moles
Total number of mole = 9 moles
Thus, we can say that the total number of mole is 9 moles
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How many molecules of HCI are in 4.91 L of HCI acid at 25°C if the density equals 1.096 g/ml
To determine the number of HCl molecules in 4.91 L of HCl acid at 25°C, we can use the following steps:
Calculate the mass of the HCl acid in 4.91 L using its density.Convert the mass of HCl acid to the number of moles using its molar mass.Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules.Calculate the mass of the HCl acid in 4.91 L using its density:[tex]\qquad\sf {Density = \dfrac{mass}{volume}}[/tex]
[tex]\qquad\sf{mass = density \times volume}[/tex]
[tex]\qquad\sf{mass = 1.096 \: g/mL \times 4.91\: L = 5.38\: kg}[/tex]
Convert the mass of HCl acid to the number of moles using its molar mass. The molar mass of HCl is 36.46 g/mol.
[tex]\sf{moles = \dfrac{mass}{ molar\: mass} = \dfrac{5.38\: kg}{36.46\: g/mol} = 147.6\: mol}[/tex]
Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules. Avogadro's number is [tex]6.02 \times 10^23[/tex] molecules/mol.
[tex]\sf number\: of\: HCl\: molecules = moles \times Avogadro's\: number[/tex]
[tex]\begin{aligned}\sf number\: of\: HCl\: molecules& =\sf 147.6 \: mol \times 6.02 \times 10^23\: molecules/mol \\& =\sf 8.88 \times 10^25\: molecules\end{aligned}[/tex]
Therefore, there are [tex]8.88 \times 10^25[/tex] HCl molecules in 4.91 L of HCl acid at 25°C, assuming the density of the acid is 1.096 g/mL.
[tex]\rule{200pt}{5pt}[/tex]
Complete the w expression for the autoionization of water at 25 °C.
w=1.00×10^−14=
Sheila spilled tea on her notes and is now unable to read some words.
What is the correct title for this section of Sheila's notes?
Volume
Density
Weight
Mass
Based οn the wοrds prοvided, a pοssible title fοr this sectiοn οf Sheila's nοtes cοuld be Mass.
What are Prοperties οf Matter in chemistry?In chemistry, prοperties οf matter refer tο the characteristics οr attributes that can be used tο describe and identify a substance. These prοperties can be divided intο twο categοries: physical prοperties and chemical prοperties.
Physical attributes are thοse that can be examined οr measured withοut changing the substance's makeup. Mass, vοlume, density, cοlοr, melting pοint, bοiling temperature, and sοlubility are examples οf physical qualities.
Chemical prοperties, οn the οther hand, describe hοw a substance interacts with οther substances tο prοduce new substances.
Understanding the prοperties οf matter is impοrtant in chemistry because it allοws scientists tο identify and classify different substances based οn their unique characteristics. This knοwledge can alsο be used tο predict hοw substances will behave under different cοnditiοns and tο design new materials with specific prοperties fοr variοus applicatiοns.
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Complete question:
Sheila spilled tea on her notes and is now unable to read some words.
What is the correct title for this section of Sheila’s notes?
Volume Density Weight MassConvert 675000 to scientific notation
Answer:
To convert 675000 to scientific notation, we need to express it in the form a × 10^n, where a is a number between 1 and 10 (but not 10 itself), and n is an integer.
Starting with 675000, we can divide by 10 repeatedly until we get a number between 1 and 10.
675000 ÷ 10 = 67500 (one division by 10)
67500 ÷ 10 = 6750 (two divisions by 10)
6750 ÷ 10 = 675 (three divisions by 10)
Now we have a number between 1 and 10 (namely, 6.75), and we know that we divided by 10 three times, so the exponent is -3.
Therefore, we can express 675000 in scientific notation as:
6.75 × 10^5
(Note that we could also express it as 6.75 × 10^2 × 10^3, but this is not in standard scientific notation, which requires the coefficient to be between 1 and 10.)
Conservation of Mass In chemical reactions, mass is neither gained nor lost. The total mass of all the reactants equals the total mass of all the products. Atoms are just rearranged into different compounds. Using this idea, solve the following problems. 1. 2KCIO3 2KCI+ 30₂ If 500 g of KCIO, decomposes and produces 303 g of KCI, how many grams of O₂ are produced? 2. N₂ + 3H₂ 2NH3 How many grams of H₂ are needed to react with 100 g of N₂ to produce 121 g of NH₂? 3. 4Fe +30₂ 2Fe₂O3 How many grams of oxygen are needed to react with 350 g of iron to produce 500 g of Fe₂O3? 4. CH₂ + 20₂2 CO₂ + 2H₂O 16 g of CH₂ react with 64 g of O₂, producing 44 g of CO₂ How many grams of water are produced? 5. CaCO3 Cao + CO, How much CO, is produced from the decomposition of 200 g of CaCO, if 112 g of CaO are produced?
Answer:
1. The balanced equation is 2KCIO3 → 2KCI + 3O2. According to the law of conservation of mass, the mass of the reactants must equal the mass of the products. Therefore, the mass of oxygen produced is:
Mass of oxygen = Mass of KCIO3 - Mass of KCI
Mass of oxygen = 500 g - 303 g
Mass of oxygen = 197 g
Therefore, 197 g of O2 are produced.
2. The balanced equation is N2 + 3H2 → 2NH3. We need to find out how much H2 is needed to react with 100 g of N2 to produce 121 g of NH3. First, we need to calculate the number of moles of N2 and NH3:
Moles of N2 = Mass of N2 / Molar mass of N2
Moles of N2 = 100 g / 28 g/mol
Moles of N2 = 3.57 mol
Moles of NH3 = Mass of NH3 / Molar mass of NH3
Moles of NH3 = 121 g / 17 g/mol
Moles of NH3 = 7.12 mol
According to the balanced equation, 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Therefore, the number of moles of H2 needed is:
Moles of H2 = Moles of N2 x (3/1)
Moles of H2 = 3.57 mol x 3
Moles of H2 = 10.71 mol
Finally, we can calculate the mass of H2 needed:
Mass of H2 = Moles of H2 x Molar mass of H2
Mass of H2 = 10.71 mol x 2 g/mol
Mass of H2 = 21.42 g
Therefore, 21.42 g of H2 are needed.
3. The balanced equation is 4Fe + 3O2 → 2Fe2O3. We need to find out how much oxygen is needed to react with 350 g of Fe to produce 500 g of Fe2O3. First, we need to calculate the number of moles of Fe and Fe2O3:
Moles of Fe = Mass of Fe / Molar mass of Fe
Moles of Fe = 350 g / 55.85 g/mol
Moles of Fe = 6.26 mol
Moles of Fe2O3 = Mass of Fe2O3 / Molar mass of Fe2O3
Moles of Fe2O3 = 500 g / 159.69 g/mol
Moles of Fe2O3 = 3.13 mol
According to the balanced equation, 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3. Therefore, the number of moles of O2 needed is:
Moles of O2 = Moles of Fe x (3/4)
Moles of O2 = 6.26 mol x (3/4)
Moles of O2 = 4.69 mol
Finally, we can calculate the mass of O2 needed:
Mass of O2 = Moles of O2 x Molar mass of O2
Mass of O2 = 4.69 mol x 32 g/mol
Mass of O2 = 150.08 g
Therefore, 150.08 g of O2 are needed.
4. The balanced equation is CH2 + 2O2 → CO2 + 2H2O. We know that 16 g of CH2 reacts with 64 g of O2 to produce 44 g of CO2. We need to find out how much water is produced. First, we need to calculate the number of moles of CH2 and CO2:
Moles of CH2 = Mass of CH2 / Molar mass of CH2
Moles of CH2 = 16 g / 14 g/mol
Moles of CH2 = 1.14 mol
Moles of CO2 = Mass of CO2 / Molar mass of CO2
Moles of CO2 = 44 g / 44 g/mol
Moles of CO2 = 1 mol
According to the balanced equation, 1 mole of CH2 reacts with 2 moles of O2 to produce 2 moles of H2O. Therefore, the number of moles of H2O produced is:
Moles of H2O = Moles of CH2 x (2/1)
Moles of H2O = 1.14 mol x 2
Moles of H2O = 2.28 mol
Finally, we can calculate the mass of H2O produced:
Mass of H2O = Moles of H2O x Molar mass of H2O
Mass of H2O = 2.28 mol x 18 g/mol
Mass of H2O = 41.04 g
Therefore, 41.04 g of H2O are produced.
5. The balanced equation is CaCO3 → CaO + CO2. We need to find out how much CO2 is produced from the decomposition of 200 g of CaCO3 if 112 g of CaO are produced. First, we need to calculate the number of moles of CaCO3 and CaO:
Moles of CaCO3 = Mass of CaCO3 / Molar mass of CaCO3
Moles of CaCO3 = 200 g / 100.09 g/mol
Moles of CaCO3 = 1.999 mol
Moles of CaO = Mass of CaO / Molar mass of CaO
Moles of CaO = 112 g / 56.08 g/mol
Moles of CaO = 1.999 mol
According to the balanced equation, 1 mole of CaCO3 produces 1 mole of CaO and 1 mole of CO2. Therefore, the number of moles of CO2 produced is:
Moles of CO2 = Moles of CaCO3 x (1/1)
Moles of CO2 = 1.999 mol
Finally, we can calculate the mass of CO2 produced:
Mass of CO2 = Moles of CO2 x Molar mass of CO2
Mass of CO2 = 1.999 mol x 44 g/mol
Mass of CO2 = 87.96 g
Therefore, 87.96 g of CO2 are produced.
A solution containing 0.13 M, each of I−, Br−, CO2−3, and C2O2−4 is titrated by a solution containing Pb2+. Place the anions in the order in which they will precipitate.
The order in which the ions would be precipitated is; Carbonate > Bromide > Iodide > Oxalate
What is the precipitation of ions?Precipitation of ions refers to the process by which two aqueous solutions containing dissolved ionic compounds are mixed, resulting in the formation of an insoluble ionic compound that falls out of solution as a solid precipitate.
This occurs when the cations and anions of the two compounds combine to form an insoluble compound, which is not soluble in water and falls out of solution as a solid. The precipitation of ions is commonly used in chemistry to isolate, identify, or quantify different types of ions in a solution.
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What's the difference between magnesium and Aluminum?
Answer:
The key difference between aluminum and magnesium is that the aluminum is a corrosion resistant metal whereas magnesium is not. Magnesium and aluminum are two chemical elements that we can categorize as metals in the periodic table. Both are naturally occurring metals in different mineral forms.
Explanation:
Which statement describes gases
according to kinetic molecular theory?
According to the kinetic molecular theory, gases are described by the following statement:
Gases consist of small particles (atoms or molecules) that are in constant random motion.What does the statement meanThis statement highlights that gases are made up of particles that are in constant motion, moving in straight lines until they collide with another particle or the walls of the container.
The motion of gas particles is random, and their energy increases as the temperature of the gas increases. The kinetic molecular theory also suggests that the particles in a gas are far apart from each other and do not attract or repel each other, except during collisions.
Additionally, the kinetic molecular theory states that the pressure of a gas is caused by the collisions of gas particles with the walls of the container. The higher the concentration of gas particles or the faster they are moving, the greater the pressure of the gas.
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What is the Percentage of Fluorine as F- in a HF (pKa= 3.33 ) solution at pH= 2.33?
Answer: The percentage of fluorine as F- in a HF solution at pH 2.33 is 9.09%.
Which statement best describes the law of conservation of mass?(1 point)
A) Reactants in a chemical reaction rearrange to form a new substance or substances.
Not college level lol
B) Reactants and products cannot escape from a closed system.
C) Matter cannot be created or destroyed in a chemical reaction.
D) Chemical symbols are used to show atom balance before and after a reaction.
Lesson name) Balanced Chemical Equations Quick Check.
Effect of Solvent:
Record the results.
H2O =
alcohol =
glycerin =
In which liquid is the salt most soluble?
Using the concept of `'Like dissolves like," explain why you got the results you did.
Explain how the choice of solvent affects the dissolving process.
Effect of Pulverizing:
Record of dissolving times.
crystal =
pulverized =
Why are the dissolving rates different?
Effect of Temperature:
Record of dissolving times.
cold =
hot
Using the concepts of kinetic energy, describe why you found the results you did.
Effect of Stirring:
Record the times necessary to dissolve each sample.
Record of dissolving time.
stirred =
unstirred =
Perform the experiment again using hot tap water this time. Are there any differences in the results between the cold water experiment and the hot water experiment? Explain.
Conclusions:
Review the four factors of dissolving you have just investigated. Given the correct solvent for a solute, what could you do to hasten the solution process?
1.
2.
3.
To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent.
Effect of Solvent:
H2O = most soluble
alcohol = least soluble
glycerin = intermediate solubility
The salt is most soluble in water because salt is an ionic compound and water is a polar solvent. "Like dissolves like" means that substances with similar polarity and intermolecular forces tend to dissolve each other. Water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other, while salt is an ionic compound made up of positively and negatively charged ions. The partial charges on the water molecule can interact with the ions of salt, causing the salt to dissolve.
The choice of solvent affects the dissolving process because it determines the ability of the solvent to interact with the solute. Solvents that are similar in polarity and intermolecular forces to the solute tend to dissolve the solute more easily.
Effect of Pulverizing:
crystal = longest dissolving time
pulverized = shortest dissolving time
The dissolving rates are different because pulverizing the salt increases its surface area, exposing more salt to the solvent and allowing for a greater opportunity for the solute-solvent interactions to occur.
Effect of Temperature:
cold = longest dissolving time
hot = shortest dissolving time
Increasing the temperature of the solvent increases the kinetic energy of the solvent molecules, which leads to more frequent and energetic collisions with the solute particles, resulting in faster dissolving rates.
Effect of Stirring:
stirred = shorter dissolving time
unstirred = longer dissolving time
Stirring increases the rate of the dissolving process by helping to disperse the solute particles evenly throughout the solvent, increasing the surface area of the solute that is in contact with the solvent, and promoting the mixing of the solute and solvent.
Conclusions:
To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent, and stir the solution to disperse the solute particles evenly throughout the solvent.
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What is the IUPAC-name for this thing?
The IUPAC name for the compound given in the question is 2,3-dibromo-5-methylheptane
How do i determine the IUPAC name for the compound?The IUPAC name for compound can be obtained by using the following steps:
Locate the longest continuous carbon chain. In this case it is carbon 7. Hence, the parent name is heptaneIdentify the substituent groups attached. In this case the substituent groups attached are: Br and CH₃ Give the substituents the best possible low count. In this case, there are two Br groups located at carbon 2 and 3 while the CH₃ is located at carbon 5Combine the above to obtain the IUPAC name for the compound.Thus, the IUPAC name for the compound is: 2,3-dibromo-5-methylheptane
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determine the mass-to-mass ratio concentration of 5 g salt in 100 g water. Show the steps of calculation.
Considering the definition of mass-to-mass ratio concentration, the mass-to-mass ratio concentration of 5 g salt in 100 g water is 0.05%.
Definition of mass-to-mass ratio concentrationThe percentage by mass or mass-to-mass ratio concentration indicates the amount of mass of solute present in 100 grams of solution.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:
mass-to-mass ratio concentration= (mass of solute÷ mass of solution)×100%
Mass-to-mass ratio concentration in this caseIn this case, you know:
mass of solute= 5 gmass of water= 100 gReplacing in the definition of mass-to-mass ratio concentration:
mass-to-mass ratio concentration= (5 g÷ 100 g)×100%
Solving:
percent by mass= 0.05 %
Finally, the mass-to-mass ratio concentration is 0.05%.
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Part 1: How many oxygen atoms are in one mole of the formula Al2(CO3)3?
Part 2: How many moles of carbon are in 3.5 moles of calcium carbonate?
There are therefore a total of 14 atoms: 2 Al, 3 C, & 9 O. In other words, 3.5 moles of calcium carbonate will contain 3.5 moles if carbon because each mole of calcium carbonate has one mole of carbon.
How is carbon in CaCO3 calculated?Hence, 40.078 divided by 100.086 everything multiplied by 100% represents the mass percentage for calcium in calcium carbonate. This yields a value of almost 40%. Carbon's mass percentage is calculated by taking 12.011 and dividing it by 100.086, then multiplying that result by 100% to get a number of roughly 12 percent.
How many oxygen atoms make up Al2O3?The subscripts (2 and 3) in this formula indicate how so many atoms will make up one unit of the molecule. There are two aluminium atoms and three oxygen atoms, respectively, denoted by the numbers 2 and 3.
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