Question 1

The products of the reaction of phosphoric acid, H₃PO₄(aq), and solid magnesium hydroxide, Mg(OH)₂(s), are aqueous magnesium phosphate and water. What is the balanced equation for this reaction?

Accepted Answer

The balanced equation is 2H₃PO₄(aq) + 3Mg(OH)₂(s) → Mg₃(PO₄)₂(aq) + 6H₂O(l), which balances the number of atoms for each element on both sides of the equation.

Question 2

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many moles of ethanol can be produced from 7.24 mol of ethylene?

Accepted Answer

The balanced equation shows a 1:1 mole ratio between ethylene and ethanol. Therefore, 7.24 moles of ethylene will produce 7.24 moles of ethanol.

Question 3

Which of the following is the SI unit for heat?

Accepted Answer

The SI unit for heat is joule (J). Calorie and kilocalorie are not SI units but are commonly used in nutrition and chemistry to quantify the amount of energy provided by food. Watt is the SI unit of power.

Question 4

Which of the following is the correct set of integer coefficients for the balanced equation? ___C₃H₈(g) + ___O₂(g) → ___CO₂(g) + ___H₂O(g)

Accepted Answer

The balanced equation for the combustion of propane (C3H8) is: 1 C3H8 + 5 O2 → 3 CO2 + 4 H2O.

Question 5

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe₂O₃(s)?

Accepted Answer

The answer of In a blast furnace, coke, which is...

Question 6

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

Accepted Answer

The balanced equation for the process is 2Fe₂O₃(s) + 6C(s) + 3O₂(g) → 4Fe(s) + 6CO₂(g), which accounts for the reduction of iron(III) oxide by carbon monoxide formed from carbon and oxygen.

Question 7

Which of the following is true regarding mass relationships in a chemical reaction?

Accepted Answer

To determine mass relationships in a chemical reaction, it is essential to start with the balanced chemical equation, which provides the mole ratio of reactants and products necessary for these calculations. Avogadro's number is used to convert between moles and number of particles, not directly for grams to moles conversions, which instead require the molar mass of the substances involved.

Question 8

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) If methanol is present in excess, how many moles of CO(g) are required to produce 16.6 moles of acetic acid?

Accepted Answer

The balanced equation shows a 1:1 molar ratio between CO(g) and CH3COOH(l). Therefore, to produce 16.6 moles of acetic acid, 16.6 moles of CO(g) are required.

Question 9

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

Accepted Answer

From the balanced equation, we can see that the mole ratio between CO and acetic acid is 1:1. Therefore, to produce 16.6 mol of acetic acid, we would need 16.6 mol of CO(g).

To convert this to grams, we need to use the molar mass of CO:

1 mol CO(g) = 28.01 g

So,

16.6 mol CO(g) x 28.01 g/mol = 465 g

Therefore, the answer is C) 465 g.

Question 10

Which of the following statements is true of the balanced equation 3H₂(g) + N₂(g) → 2NH₃(g)?

Accepted Answer

The balanced equation indicates that three moles of hydrogen react with one mole of nitrogen to form two moles of ammonia. Grams cannot be determined from the equation alone as it depends on the mass of the reactants used. Therefore, statement A and C are not true. Statement D is false as there is a correct statement.

Question 11

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Accepted Answer

The balanced equation shows a 1:1 mole ratio between ethylene and ethanol. The molar mass of ethanol (C2H5OH) is approximately 46 g/mol. Therefore, 7.24 mol of ethylene would produce 7.24 mol of ethanol, which equals 7.24 mol * 46 g/mol = 333.04 g, rounded to 334 g.

Question 12

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N₂(g) + 3H₂(g) → 2NH₃(g)?

Accepted Answer

The coefficients in a balanced chemical equation represent the mole ratios between the reactants and products. Therefore, the number of moles of one substance can be determined if the number of moles of another substance is known. In this case, if 4.2 mol of N₂ react completely, we can use the coefficient in front of N₂ (1) to determine that 1 mol of N₂ produces 2 mol of NH₃. Therefore, 4.2 mol of N₂ will produce 2 x 4.2 mol = 8.4 mol of NH₃.

Question 13

Sodium sulfite, Na₂SO₃(aq), is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na₂SO₄(aq). Which of the following is the balanced equation for this reaction?

Accepted Answer

The balanced chemical equation for the reaction between sodium sulfite and oxygen to form sodium sulfate requires a stoichiometry that balances both the sodium, sulfur, and oxygen atoms. Option C correctly shows that two molecules of sodium sulfite react with one molecule of oxygen (O2) to produce two molecules of sodium sulfate, maintaining the balance of atoms on both sides of the equation.

Question 14

Which of the following is the correct set of integer coefficients for the balanced equation? ___C₆H₁₄(g) + ___O₂(g) → ___CO₂(g) + ___H₂O(g)

Accepted Answer

To balance the equation, we need to make sure that the number of atoms of each element is equal on both sides of the equation. Starting with carbon, we have one carbon atom on the left-hand side and one carbon atom on the right-hand side, so the coefficient for carbon will be 1. Similarly, we have one sulfur atom on the left-hand side and one sulfur atom on the right-hand side, so the coefficient for sulfur will also be 1. Moving on to oxygen, we have 12 oxygen atoms on the right-hand side (in the CO and H2O products), so we need to add 12 oxygen atoms to the left-hand side by multiplying the O2 reactant by 6. Finally, we have 1 hydrogen atom on the left-hand side and 12 hydrogen atoms on the right-hand side, so we need to add 11 more hydrogen atoms to the left-hand side by multiplying the H2S reactant by 2. Therefore, the balanced equation has coefficients of 2, 19, 12, and 14 for the H2S, O2, CO, and H2O, respectively.

Question 15

Which of the following is the correct set of integer coefficients for the balanced equation? ___C₅H₁₂(g) + ___O₂(g) → ___CO₂(g) + ___H₂O(g)

Accepted Answer

The balanced equation for the reaction is CS2(g) + 3O2(g) → CO2(g) + 2SO2(g), which translates to coefficients 1 for CS2, 3 for O2, 1 for CO2, and 2 for SO2. However, none of the given options match this exact set. The correct choice, B, corresponds to a different reaction than the one described, indicating a possible misunderstanding in the transcription of the chemical formulas or the coefficients. Given the options, B is chosen based on the assumption of a typo or misunderstanding in the question setup, as it's the closest to a logical set of coefficients for a typical combustion reaction involving carbon disulfide (CS2) and oxygen (O2), despite not matching the expected coefficients for the provided chemical equation.

Question 16

The reaction of nitric acid, HNO₃(aq), with calcium carbonate, CaCO₃(s), produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

Accepted Answer

The balanced equation for the reaction is: 2 HNO3(aq) + CaCO3(s) → Ca(NO3)2(aq) + CO2(g) + H2O(l). This equation is balanced because there are two nitrate ions and two hydrogen ions on both sides, as well as one calcium ion, one carbonate ion, one carbon dioxide molecule, and one water molecule on both sides. Choice D is the only option that correctly reflects this balanced equation.

Question 17

Which of the following is true of specific heat?

Accepted Answer

Specific heat is the amount of heat needed to raise the temperature of 1 g of a substance by 1°C. It is not a chemical property, and different substances have different specific heats. It is also not related to changing a substance's state.

Question 18

Which of the following is the correct set of integer coefficients for the balanced equation? ___CO₂(g) + ___H₂O(l) → ___C₆H₁₂O₆(aq) + ___O₂(g)

Accepted Answer

The balanced equation for the photosynthesis reaction is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

Question 19

Which of the following statements is true of the balanced equation N₂(g) + 2O₂(g) → 2NO₂(g)?

Accepted Answer

The balanced equation shows that one mole of N₂ (a compound containing nitrogen and sulfur) reacts with two moles of O₂ (oxygen) to form two moles of NO₂ (nitrogen dioxide). Therefore, statement A is true. Statement B is incorrect because it implies that the equation is based on the mass of the substances rather than the number of moles. Statement C is partially true but includes unnecessary information that is not directly related to the equation. Statement D is incorrect because statement A is true.

Question 20

Which of the following is a form of energy?

Accepted Answer

Heat is a form of energy, as it is the transfer of thermal energy from one body to another. Temperature, volume, and mass are all physical properties and not forms of energy.

Quiz 4: Chemical Reactions

The products of the reaction of phosphoric acid, H₃PO₄(aq) , and solid magnesium hydroxide, Mg(OH) ₂(s) , are aqueous magnesium phosphate and water. What is the balanced equation for this reaction?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many moles of ethanol can be produced from 7.24 mol of ethylene?

Which of the following is the SI unit for heat?

Which of the following is the correct set of integer coefficients for the balanced equation? _C₃H₈(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe₂O₃(s) ?

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

Which of the following is true regarding mass relationships in a chemical reaction?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) If methanol is present in excess, how many moles of CO(g) are required to produce 16.6 moles of acetic acid?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

Which of the following statements is true of the balanced equation 3H₂(g) + N₂(g) → 2NH₃(g) ?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N₂(g) + 3H₂(g) → 2NH₃(g) ?

Sodium sulfite, Na₂SO₃(aq) , is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na₂SO₄(aq) . Which of the following is the balanced equation for this reaction?

Which of the following is the correct set of integer coefficients for the balanced equation? _C₆H₁₄(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

Which of the following is the correct set of integer coefficients for the balanced equation? _C₅H₁₂(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

The reaction of nitric acid, HNO₃(aq) , with calcium carbonate, CaCO₃(s) , produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

Which of the following is true of specific heat?

Which of the following is the correct set of integer coefficients for the balanced equation? _CO₂(g) + _H₂O(l) → _C₆H₁₂O₆(aq) + _O₂(g)

Which of the following statements is true of the balanced equation N₂(g) + 2O₂(g) → 2NO₂(g) ?

Which of the following is a form of energy?

Quiz 4: Chemical Reactions

The products of the reaction of phosphoric acid, H3PO4(aq) , and solid magnesium hydroxide, Mg(OH) 2(s) , are aqueous magnesium phosphate and water. What is the balanced equation for this reaction?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C2H4(g) + H2O(g) → C2H5OH(l) If water is present in excess, how many moles of ethanol can be produced from 7.24 mol of ethylene?

Which of the following is the SI unit for heat?

Which of the following is the correct set of integer coefficients for the balanced equation? ___C3H8(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

In a blast furnace, coke, which is solid carbon, reacts with O2(g) to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe2O3(s) ?

In a blast furnace, coke, which is solid carbon, reacts with O2(g) to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

Which of the following is true regarding mass relationships in a chemical reaction?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH3OH(g) + CO(g) → CH3COOH(l) If methanol is present in excess, how many moles of CO(g) are required to produce 16.6 moles of acetic acid?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH3OH(g) + CO(g) → CH3COOH(l) How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

Which of the following statements is true of the balanced equation 3H2(g) + N2(g) → 2NH3(g) ?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C2H4(g) + H2O(g) → C2H5OH(l) If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N2(g) + 3H2(g) → 2NH3(g) ?

Sodium sulfite, Na2SO3(aq) , is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na2SO4(aq) . Which of the following is the balanced equation for this reaction?

Which of the following is the correct set of integer coefficients for the balanced equation? ___C6H14(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

Which of the following is the correct set of integer coefficients for the balanced equation? ___C5H12(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

The reaction of nitric acid, HNO3(aq) , with calcium carbonate, CaCO3(s) , produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

Which of the following is true of specific heat?

Which of the following is the correct set of integer coefficients for the balanced equation? ___CO2(g) + ___H2O(l) → ___C6H12O6(aq) + ___O2(g)

Which of the following statements is true of the balanced equation N2(g) + 2O2(g) → 2NO2(g) ?

Which of the following is a form of energy?

The products of the reaction of phosphoric acid, H₃PO₄(aq) , and solid magnesium hydroxide, Mg(OH) ₂(s) , are aqueous magnesium phosphate and water. What is the balanced equation for this reaction?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many moles of ethanol can be produced from 7.24 mol of ethylene?

Which of the following is the correct set of integer coefficients for the balanced equation? _C₃H₈(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for the reaction of carbon monoxide with Fe₂O₃(s) ?

In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) If methanol is present in excess, how many moles of CO(g) are required to produce 16.6 moles of acetic acid?

In the industrial synthesis of acetic acid, methanol is made to react with carbon monoxide. The balanced equation for this reaction is as follows: CH₃OH(g) + CO(g) → CH₃COOH(l) How many grams of CO(g) are required to produce 16.6 mol of acetic acid?

Which of the following statements is true of the balanced equation 3H₂(g) + N₂(g) → 2NH₃(g) ?

Ethanol is produced industrially by the acid-catalyzed reaction of ethylene with water. The balanced equation for this reaction is as follows: C₂H₄(g) + H₂O(g) → C₂H₅OH(l) If water is present in excess, how many grams of ethanol can be produced from 7.24 mol of ethylene?

Which of the following can be determined using only the coefficients of the balanced chemical equation for the reaction N₂(g) + 3H₂(g) → 2NH₃(g) ?

Sodium sulfite, Na₂SO₃(aq) , is added to wine as an antioxidant as it reacts with the oxygen in the air to form sodium sulfate, Na₂SO₄(aq) . Which of the following is the balanced equation for this reaction?

Which of the following is the correct set of integer coefficients for the balanced equation? _C₆H₁₄(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

Which of the following is the correct set of integer coefficients for the balanced equation? _C₅H₁₂(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

The reaction of nitric acid, HNO₃(aq) , with calcium carbonate, CaCO₃(s) , produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

Which of the following is the correct set of integer coefficients for the balanced equation? _CO₂(g) + _H₂O(l) → _C₆H₁₂O₆(aq) + _O₂(g)

Which of the following statements is true of the balanced equation N₂(g) + 2O₂(g) → 2NO₂(g) ?