Question 1

The reaction Ca + Cl2 $\rarr$  CaCl2 is a redox reaction.

Accepted Answer

A) True 
 B)False

Question 2

The energy involved in chemical reactions

Accepted Answer

A)  always appears as heat. 
B)  always appears as light. 
C)  always appears as electricity. 
D)  can take many forms. 
A)  always appears as heat. 
B)  always appears as light. 
C)  always appears as electricity. 
D)  can take many forms.

Question 3

Which set of coefficients balances the equation?
_____ CH4 $\rarr$ ______C3H8 +_____H2

Accepted Answer

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

Question 4

In the reaction CuCl2 + Fe $\rarr$ Cu + FeCl2 the CuCl2 is the oxidizing agent.

Accepted Answer

A) True 
 B)False

Question 5

What is the oxidation number of Mn in KMnO4?

Accepted Answer

A)  +9 
B)  +5 
C)  +7 
D)  +4 
A)  +9 
B)  +5 
C)  +7 
D)  +4

Question 6

Lycopene,a phytonutrient,has several potential health benefits,including protection against prostate,cervical and pancreatic cancer.Which of the following is a good source of this substance?

Accepted Answer

A)  spinach 
B)  broccoli 
C)  strawberries 
D)  tomatoes 
A)  spinach 
B)  broccoli 
C)  strawberries 
D)  tomatoes

Question 7

Some redox reactions involve only oxidation without any reduction.

Accepted Answer

A) True 
 B)False

Question 8

According to the law of conservation of matter,which of the following may NEVER occur as a result of a chemical reaction?

Accepted Answer

A)  creation of new chemical species. 
B)  reaction of starting materials. 
C)  rearranged to form new substances. 
D)  reduction in total mass. 
A)  creation of new chemical species. 
B)  reaction of starting materials. 
C)  rearranged to form new substances. 
D)  reduction in total mass.

Question 9

Which of the following is a combination reaction?

Accepted Answer

A)  SO2 + O2 $\rarr$  2SO3 
B)  2C2H2 + 5O2 $\rarr$ 4CO2 + 2H2O 
C)  2H2O2 $\rarr$  2H2O + O2 
D)  AgNO3 + NaCl $\rarr$  AgCl + NaNO3 
A)  SO2 + O2 $\rarr$  2SO3 
B)  2C2H2 + 5O2 $\rarr$ 4CO2 + 2H2O 
C)  2H2O2 $\rarr$  2H2O + O2 
D)  AgNO3 + NaCl $\rarr$  AgCl + NaNO3

Question 10

When nitrogen (N2)reacts with sodium (Na),sodium nitride (Na3N)is formed.The balanced equation for the reaction would be:

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 11

When the following equation is balanced,how many oxygen atoms are present on the reactant side of the equation? C2H6 + O2 $\rarr$ CO2 + H2O

Accepted Answer

A)  14 
B)  7 
C)  3 
D)  20 
A)  14 
B)  7 
C)  3 
D)  20

Question 12

Which of the following is a decomposition reaction?

Accepted Answer

A)  SO2 + O2 $\rarr$  2SO3 
B)  2C2H2 + 5O2 $\rarr$ 4CO2 + 2H2O 
C)  2H2O2 $\rarr$ 2H2O + O2 
D)  AgNO3 + NaCl $\rarr$  AgCl + NaNO3 
A)  SO2 + O2 $\rarr$  2SO3 
B)  2C2H2 + 5O2 $\rarr$ 4CO2 + 2H2O 
C)  2H2O2 $\rarr$ 2H2O + O2 
D)  AgNO3 + NaCl $\rarr$  AgCl + NaNO3

Question 13

What are coefficients needed to balance the following reaction?
2 CH4 + ____ O2 $\rarr$  ____ CO2 + ____ H2O

Accepted Answer

A)  8,2,4 
B)  4,1,2 
C)  4,2,4 
D)  none of these 
A)  8,2,4 
B)  4,1,2 
C)  4,2,4 
D)  none of these

Question 14

Suppose 2.43 g of magnesium is reacted with 3.20 g of oxygen: 2Mg + O2 $\rarr$  2MgO.How many grams of MgO will be produced?

Accepted Answer

A)  5.63 
B)  1.27 
C)  8.06 
D)  4.03 
A)  5.63 
B)  1.27 
C)  8.06 
D)  4.03

Question 15

Propane,C3H8,burns to produce carbon dioxide and water by the equation below.What is the coefficient in front of the carbon dioxide in the balanced equation?
C3H8 + O2 $\rarr$  CO2 + H2O

Accepted Answer

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

Question 16

Air bags serve an important role in providing driver and front-seat passenger protection in the event of an automobile accident.They rely on several chemical reactions.Which of the following chemicals is responsible for N2 production?

Accepted Answer

A)  sodium azide 
B)  potassium nitrate 
C)  silicon dioxide 
D)  more than one answer is correct. 
A)  sodium azide 
B)  potassium nitrate 
C)  silicon dioxide 
D)  more than one answer is correct.

Question 17

Which of the following is a single replacement reaction?

Accepted Answer

A)  CuO + H2 $\rarr$  Cu + H2O 
B)  HBr + KOH $\rarr$ H2O + KBr 
C)  SO2 + H2O $\rarr$ H2SO3 
D)  2HI $\rarr$  I2 + H2 
A)  CuO + H2 $\rarr$  Cu + H2O 
B)  HBr + KOH $\rarr$ H2O + KBr 
C)  SO2 + H2O $\rarr$ H2SO3 
D)  2HI $\rarr$  I2 + H2

Question 18

The net ionic equation for the reaction H2SO4 + NaOH $\rarr$ Na2SO4 + H2O is
H+ + OH $\rarr$ H2O.

Accepted Answer

A) True 
 B)False

Question 19

In the reaction Zn + Cu(NO3)2 $\rarr$ Cu + Zn(NO3),the Zn is reduced.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following contains the metal with the highest oxidation number?

Accepted Answer

A)  CaCl2 
B)  NaCl 
C)  FeCl3 
D)  CuCl2 
A)  CaCl2 
B)  NaCl 
C)  FeCl3 
D)  CuCl2

Exam 5: Chemical Reactions

The reaction Ca + Cl2 →\rarr→ CaCl2 is a redox reaction.

The energy involved in chemical reactions

Which set of coefficients balances the equation? _____ CH4 →\rarr→ ______C3H8 +_____H2

In the reaction CuCl2 + Fe →\rarr→ Cu + FeCl2 the CuCl2 is the oxidizing agent.

What is the oxidation number of Mn in KMnO4?

Lycopene,a phytonutrient,has several potential health benefits,including protection against prostate,cervical and pancreatic cancer.Which of the following is a good source of this substance?

Some redox reactions involve only oxidation without any reduction.

According to the law of conservation of matter,which of the following may NEVER occur as a result of a chemical reaction?

Which of the following is a combination reaction?

When nitrogen (N2)reacts with sodium (Na),sodium nitride (Na3N)is formed.The balanced equation for the reaction would be:

When the following equation is balanced,how many oxygen atoms are present on the reactant side of the equation? C2H6 + O2 →\rarr→ CO2 + H2O

Which of the following is a decomposition reaction?

What are coefficients needed to balance the following reaction? 2 CH4 + ____ O2 →\rarr→ ____ CO2 + ____ H2O

Suppose 2.43 g of magnesium is reacted with 3.20 g of oxygen: 2Mg + O2 →\rarr→ 2MgO.How many grams of MgO will be produced?

Propane,C3H8,burns to produce carbon dioxide and water by the equation below.What is the coefficient in front of the carbon dioxide in the balanced equation? C3H8 + O2 →\rarr→ CO2 + H2O

Air bags serve an important role in providing driver and front-seat passenger protection in the event of an automobile accident.They rely on several chemical reactions.Which of the following chemicals is responsible for N2 production?

Which of the following is a single replacement reaction?

The net ionic equation for the reaction H2SO4 + NaOH →\rarr→ Na2SO4 + H2O is H+ + OH →\rarr→ H2O.

In the reaction Zn + Cu(NO3)2 →\rarr→ Cu + Zn(NO3),the Zn is reduced.

Which of the following contains the metal with the highest oxidation number?

Matter, measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

The reaction Ca + Cl₂ $\rarr$ CaCl₂ is a redox reaction.

Which set of coefficients balances the equation? _ CH₄ $\rarr$ C₃H₈ +___H₂

In the reaction CuCl₂ + Fe $\rarr$ Cu + FeCl₂ the CuCl₂ is the oxidizing agent.

What is the oxidation number of Mn in KMnO₄?

When nitrogen (N₂)reacts with sodium (Na),sodium nitride (Na₃N)is formed.The balanced equation for the reaction would be:

When the following equation is balanced,how many oxygen atoms are present on the reactant side of the equation? C₂H₆ + O₂ $\rarr$ CO₂ + H₂O

What are coefficients needed to balance the following reaction? 2 CH₄ + O₂ $\rarr$ CO₂ + H₂O

Suppose 2.43 g of magnesium is reacted with 3.20 g of oxygen: 2Mg + O₂ $\rarr$ 2MgO.How many grams of MgO will be produced?

Propane,C₃H₈,burns to produce carbon dioxide and water by the equation below.What is the coefficient in front of the carbon dioxide in the balanced equation? C₃H₈ + O₂ $\rarr$ CO₂ + H₂O

Air bags serve an important role in providing driver and front-seat passenger protection in the event of an automobile accident.They rely on several chemical reactions.Which of the following chemicals is responsible for N₂ production?

The net ionic equation for the reaction H₂SO₄ + NaOH $\rarr$ Na₂SO₄ + H₂O is H⁺ + OH $\rarr$ H₂O.

In the reaction Zn + Cu(NO₃)₂ $\rarr$ Cu + Zn(NO₃),the Zn is reduced.