Question 1

When the equation below is balanced,the coefficient of copper is:
Zn + CuSO₄ → ZnSO₄ + Cu

Accepted Answer

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

Question 2

Nitroglycerin has a formula C₃H₅(NO₃)₃.The molar mass of nitroglycerin is

Accepted Answer

A) 65 g/mole. 
B) 227 g/mole. 
C) 309 g/mole. 
D) 398 g/mole. 
A) 65 g/mole. 
B) 227 g/mole. 
C) 309 g/mole. 
D) 398 g/mole. B

Question 3

How many moles of (NH₄)₂S are there in 75 g of (NH₄)₂S?

Accepted Answer

A) 1)04 
B) 1)10 
C) 1)50 
D) 1)56 
A) 1)04 
B) 1)10 
C) 1)50 
D) 1)56 B

Question 4

Avogadro's number is big.If you had 6.02 × 10²³ dollars,and could spend it at 1 billion (10⁹)dollars per second for your entire life (≈ 75 years),what approximate percentage of your original money would you have left?

Accepted Answer

A) 0% 
B) 10% 
C) 50% 
D) ≈ 100% 
A) 0% 
B) 10% 
C) 50% 
D) ≈ 100%

Question 5

The formula mass of Na₂S is 55 u.

Accepted Answer

A) True 
 B)False

Question 6

Propane (C₃H₈ )reacts with oxygen (O₂)to form carbon dioxide (CO₂)and water (H₂O).When the equation below is balanced,the coefficient of water is:
C₃H₈ + O₂ → CO₂ + H₂O

Accepted Answer

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

Question 7

When the equation below is balanced,the coefficient of silver is:
Cu + AgNO₃ → Cu(NO₃)₂ + Ag

Accepted Answer

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

Question 8

Tin was among the first metals used by humans.Elemental tin is produced by heating tin(IV)oxide,the principal ore of tin,with carbon.The products of this reaction are tin and carbon dioxide.When the equation is written and balanced,the coefficient of tin is

Accepted Answer

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

Question 9

When the equation below is balanced,the coefficient of sulfuric acid,H₂SO₄ is:
NaCN + H₂SO₄ → Na₂SO₄ + HCN

Accepted Answer

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

Question 10

What is the molecular mass of N₂O?

Accepted Answer

A) 30 g/mole 
B) 30 u 
C) 44 g/mole 
D) 44 u 
A) 30 g/mole 
B) 30 u 
C) 44 g/mole 
D) 44 u

Question 11

Octane (C₈H₁₈ )reacts with oxygen (O₂)to form carbon dioxide (CO₂)and water (H₂O).When the equation below is balanced,the coefficient of octane is:
C₈H₁₈ + O₂ → CO₂ + H₂O

Accepted Answer

A) 8 
B) 25 
C) 2 
D) 16 
A) 8 
B) 25 
C) 2 
D) 16

Question 12

A solution contains 20 mL of ethanol in a total volume of 100 mL.The concentration of this solution is

Accepted Answer

A) 2)0 M. 
B) 2)0 % by mass. 
C) 20 % by mass. 
D) 20 % by volume. 
A) 2)0 M. 
B) 2)0 % by mass. 
C) 20 % by mass. 
D) 20 % by volume.

Question 13

When 5 liters of hydrogen gas and 2.5 liter of oxygen gas react to form water at a constant temperature and pressure,how many liters of water vapor (steam)will be formed?

Accepted Answer

A) 2.5 
B) 5 
C) 3 
D) .5 
A) 2.5 
B) 5 
C) 3 
D) .5

Question 14

How many liters of a 0.2 M NaOH solution are needed in order to have 1.0 moles of NaOH?

Accepted Answer

A) 0)2 L 
B) 0)8 L 
C) 5 L 
D) 8 L 
A) 0)2 L 
B) 0)8 L 
C) 5 L 
D) 8 L

Question 15

Which of the following contains Avogadro's number of atoms?

Accepted Answer

A) 15.5 g of phosphorus 
B) 39 g of potassium 
C) 40 g of bromine 
D) 100 g of mercury 
A) 15.5 g of phosphorus 
B) 39 g of potassium 
C) 40 g of bromine 
D) 100 g of mercury

Question 16

Aspirin has a formula C₉H₈O₄.The molar mass of aspirin is

Accepted Answer

A) 95 g/mole. 
B) 180 g/mole. 
C) 220 g/mole. 
D) 325 g/mole. 
A) 95 g/mole. 
B) 180 g/mole. 
C) 220 g/mole. 
D) 325 g/mole.

Question 17

The total number of each type of atom must be the same on both sides of an equation in order to satisfy the

Accepted Answer

A) Law of Combining Volumes. 
B) Law of Conservation of Matter. 
C) Law of Constant Composition. 
D) Law of Multiple Proportions. 
A) Law of Combining Volumes. 
B) Law of Conservation of Matter. 
C) Law of Constant Composition. 
D) Law of Multiple Proportions.

Question 18

A chemist dissolves 9 g of NaCl in 225 mL of water.Water is the

Accepted Answer

A) solution. 
B) solute. 
C) solvent. 
D) solubility. 
A) solution. 
B) solute. 
C) solvent. 
D) solubility.

Question 19

Calcium metal reacts with water to form calcium hydroxide and hydrogen gas.How many grams of hydrogen are formed when 0.50 g of calcium are added to water?

Accepted Answer

A) 0)025 g 
B) 0)050 g 
C) 0)10 g 
D) 0)50 g 
A) 0)025 g 
B) 0)050 g 
C) 0)10 g 
D) 0)50 g

Question 20

How many mL of a 4.0% NaOH solution do you need to have 16 g of NaOH?

Accepted Answer

A) 160 mL 
B) 250 mL 
C) 400 mL 
D) 640 mL 
A) 160 mL 
B) 250 mL 
C) 400 mL 
D) 640 mL

Exam 5: Chemical Accounting

When the equation below is balanced,the coefficient of copper is: Zn + CuSO₄ → ZnSO₄ + Cu

Nitroglycerin has a formula C₃H₅(NO₃)₃.The molar mass of nitroglycerin is

How many moles of (NH₄)₂S are there in 75 g of (NH₄)₂S?

Avogadro's number is big.If you had 6.02 × 10²³ dollars,and could spend it at 1 billion (10⁹)dollars per second for your entire life (≈ 75 years),what approximate percentage of your original money would you have left?

The formula mass of Na₂S is 55 u.

Propane (C₃H₈ )reacts with oxygen (O₂)to form carbon dioxide (CO₂)and water (H₂O).When the equation below is balanced,the coefficient of water is: C₃H₈ + O₂ → CO₂ + H₂O

When the equation below is balanced,the coefficient of silver is: Cu + AgNO₃ → Cu(NO₃)₂ + Ag

Tin was among the first metals used by humans.Elemental tin is produced by heating tin(IV)oxide,the principal ore of tin,with carbon.The products of this reaction are tin and carbon dioxide.When the equation is written and balanced,the coefficient of tin is

When the equation below is balanced,the coefficient of sulfuric acid,H₂SO₄ is: NaCN + H₂SO₄ → Na₂SO₄ + HCN

What is the molecular mass of N₂O?

Octane (C₈H₁₈ )reacts with oxygen (O₂)to form carbon dioxide (CO₂)and water (H₂O).When the equation below is balanced,the coefficient of octane is: C₈H₁₈ + O₂ → CO₂ + H₂O

A solution contains 20 mL of ethanol in a total volume of 100 mL.The concentration of this solution is

When 5 liters of hydrogen gas and 2.5 liter of oxygen gas react to form water at a constant temperature and pressure,how many liters of water vapor (steam)will be formed?

How many liters of a 0.2 M NaOH solution are needed in order to have 1.0 moles of NaOH?

Which of the following contains Avogadro's number of atoms?

Aspirin has a formula C₉H₈O₄.The molar mass of aspirin is

The total number of each type of atom must be the same on both sides of an equation in order to satisfy the

A chemist dissolves 9 g of NaCl in 225 mL of water.Water is the

Calcium metal reacts with water to form calcium hydroxide and hydrogen gas.How many grams of hydrogen are formed when 0.50 g of calcium are added to water?

How many mL of a 4.0% NaOH solution do you need to have 16 g of NaOH?

Chemistry

Atoms

Atomic Structure

Chemical Bonds

Gases, Liquids, Solids, and Intermolecular Forces

Acids and Bases

Oxidation and Reduction

Organic Chemistry

Polymers

Nuclear Chemistry

Chemistry of the Earth

Air

Water

Energy

Biochemistry

Food

Drugs

Fitness and Health

Chemistry Down on the Farm

Household Chemicals

Poisons

Filters