Question 1

When the equation below is balanced,the coefficient of oxygen is:
Fe + O₂ → Fe₂O₃

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
A) 0 
B) 1 
C) 2 
D) 3

Question 2

The explanation of the observations leading to the law of combining volumes is often called "Avogadro's hypothesis." This explanation states that equal volumes of gases at the same temperature and pressure have

Accepted Answer

A) the same number of molecules. 
B) different numbers of molecules. 
C) the same reactivity. 
D) different energies. 
A) the same number of molecules. 
B) different numbers of molecules. 
C) the same reactivity. 
D) different energies.

Question 3

When the equation below is balanced,the coefficient of aluminum chloride is:
AlCl₃ + H₂SO₄ → Al₂(SO₄)₃ + HCl

Accepted Answer

A) 2 
B) 3 
C) 1 
D) 6 
A) 2 
B) 3 
C) 1 
D) 6

Question 4

In the reaction CH₄ + 2 O₂ → CO₂ + 2 H₂O,how many moles of oxygen are required to burn 16.0 g of methane?

Accepted Answer

A) 0)500 
B) 1)00 
C) 2)00 
D) 32.0 
A) 0)500 
B) 1)00 
C) 2)00 
D) 32.0

Question 5

When oxygen,O₂,is passed through an electrical spark (lightning is a good natural source of an electrical spark),ozone,O₃ is formed.Write and balance the equation.

Accepted Answer

The answer of When oxygen,O₂,is passed through an electrical spark...

Question 6

In an equation,the number in front of a formula is the coefficient.

Accepted Answer

A) True 
 B)False

Question 7

Gay-Lussac's law of combining volumes states that the volumes of reactants and products are in small whole-number ratios.Which of the following is NOT an assumption for the law of combining volumes?

Accepted Answer

A) The products and reactants must all be gases. 
B) The products and reactants must all be at the same temperature. 
C) The products and reactants must all be at the same pressure. 
D) The products and reactants must all be gases or liquids. 
A) The products and reactants must all be gases. 
B) The products and reactants must all be at the same temperature. 
C) The products and reactants must all be at the same pressure. 
D) The products and reactants must all be gases or liquids.

Question 8

Which one of the following reactions is NOT balanced?

Accepted Answer

A) 2 CO + O₂ → 2 CO₂ 
B) 2 SO₂ + O₂ → 2 SO₃ 
C) 2 KNO₃ + 10 K → 5 K₂O + N₂ 
D) SF₄ + 3 H₂O → H₂SO₃ + 4 HF 
A) 2 CO + O₂ → 2 CO₂ 
B) 2 SO₂ + O₂ → 2 SO₃ 
C) 2 KNO₃ + 10 K → 5 K₂O + N₂ 
D) SF₄ + 3 H₂O → H₂SO₃ + 4 HF

Question 9

In the reaction CH₄ + 2 O₂ → CO₂ + 2 H₂O,how many moles of oxygen are required to burn 8.0 g of methane?

Accepted Answer

A) 0.5 
B) 1.0 
C) 2.0 
D) 32 
A) 0.5 
B) 1.0 
C) 2.0 
D) 32

Question 10

600 mL of a 5.0 M solution of sodium hydroxide contains 5.0 moles of sodium hydroxide.

Accepted Answer

A) True 
 B)False

Question 11

The label which indicates that a substance is a gas is

Accepted Answer

A) (g) 
B) (l) 
C) (s) 
D) (aq) 
A) (g) 
B) (l) 
C) (s) 
D) (aq)

Question 12

Expressing concentrations in terms of molarity is especially convenient since it allows one to count chemical particles by measuring

Accepted Answer

A) the weights of solutes. 
B) the weights of solutions. 
C) the volumes of solvents. 
D) the volumes of solutions. 
A) the weights of solutes. 
B) the weights of solutions. 
C) the volumes of solvents. 
D) the volumes of solutions.

Question 13

A solution that is 1 molar contains

Accepted Answer

A) six moles of solute in 6 moles of solvent. 
B) five moles of solute in 5 moles of solution. 
C) six moles of solute in 600 g of solution. 
D) four moles of solute in 4 liters of solution. 
A) six moles of solute in 6 moles of solvent. 
B) five moles of solute in 5 moles of solution. 
C) six moles of solute in 600 g of solution. 
D) four moles of solute in 4 liters of solution.

Question 14

50 grams of sodium hydroxide will react with 50 grams of hydrochloric acid to give 50 grams of sodium chloride and 50 grams of water.

Accepted Answer

A) True 
 B)False

Question 15

The quantitative relationship between reactants and products in a chemical reaction is

Accepted Answer

A) relative mass. 
B) percent yield. 
C) molarity. 
D) stoichiometry. 
A) relative mass. 
B) percent yield. 
C) molarity. 
D) stoichiometry.

Question 16

The law of combining volumes applies only to

Accepted Answer

A) gases. 
B) liquids. 
C) solids. 
D) gases and liquids. 
A) gases. 
B) liquids. 
C) solids. 
D) gases and liquids.

Question 17

Balance the equation: NaCN + H₂SO₄ → Na₂SO₄ + HCN

Accepted Answer

2 NaCN + H

Question 18

The molarity of a solution that contains 0.50 moles of NaOH in 200.0 milliliters of water is

Accepted Answer

A) 0)25 M. 
B) 0)5 M. 
C) 1)0 M. 
D) 2)5 M. 
A) 0)25 M. 
B) 0)5 M. 
C) 1)0 M. 
D) 2)5 M.

Question 19

Balance the equation: Zn + CuSO₄ → ZnSO₄ + Cu

Accepted Answer

Zn + CuSO₄

Question 20

When oxygen,O₂,is passed through an electrical spark (lightning is a good natural source of an electrical spark),ozone,O₃,is formed.When the equation is balanced,the coefficient of ozone is

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Exam 5: Chemical Accounting

When the equation below is balanced,the coefficient of oxygen is: Fe + O₂ → Fe₂O₃

The explanation of the observations leading to the law of combining volumes is often called "Avogadro's hypothesis." This explanation states that equal volumes of gases at the same temperature and pressure have

When the equation below is balanced,the coefficient of aluminum chloride is: AlCl₃ + H₂SO₄ → Al₂(SO₄)₃ + HCl

In the reaction CH₄ + 2 O₂ → CO₂ + 2 H₂O,how many moles of oxygen are required to burn 16.0 g of methane?

When oxygen,O₂,is passed through an electrical spark (lightning is a good natural source of an electrical spark),ozone,O₃ is formed.Write and balance the equation.

In an equation,the number in front of a formula is the coefficient.

Gay-Lussac's law of combining volumes states that the volumes of reactants and products are in small whole-number ratios.Which of the following is NOT an assumption for the law of combining volumes?

Which one of the following reactions is NOT balanced?

In the reaction CH₄ + 2 O₂ → CO₂ + 2 H₂O,how many moles of oxygen are required to burn 8.0 g of methane?

600 mL of a 5.0 M solution of sodium hydroxide contains 5.0 moles of sodium hydroxide.

The label which indicates that a substance is a gas is

Expressing concentrations in terms of molarity is especially convenient since it allows one to count chemical particles by measuring

A solution that is 1 molar contains

50 grams of sodium hydroxide will react with 50 grams of hydrochloric acid to give 50 grams of sodium chloride and 50 grams of water.

The quantitative relationship between reactants and products in a chemical reaction is

The law of combining volumes applies only to

Balance the equation: NaCN + H₂SO₄ → Na₂SO₄ + HCN

The molarity of a solution that contains 0.50 moles of NaOH in 200.0 milliliters of water is

Balance the equation: Zn + CuSO₄ → ZnSO₄ + Cu

When oxygen,O₂,is passed through an electrical spark (lightning is a good natural source of an electrical spark),ozone,O₃,is formed.When the equation is balanced,the coefficient of ozone is

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