Question 1

The stronger the bond, the higher its bond dissociation energy.

Accepted Answer

A) True 
 B)False

Question 2

Consider the following reversible reaction at equilibrium: CO(g)+ Cl2(g)   COCl2(g). If the pressure inside the reaction vessel is increased, the equilibrium will shift to the left.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following energy quantities is equivalent to 578 J?

Accepted Answer

A) 5.78 × 105 kJ 
B) 138 kcal 
C) 0.138 kcal 
D) 1.38 × 105 kcal 
A) 5.78 × 105 kJ 
B) 138 kcal 
C) 0.138 kcal 
D) 1.38 × 105 kcal

Question 4

In an _____ reaction, the products are lower in energy than the reactants.

Accepted Answer

The answer of In an _____ reaction, the products are...

Question 5

When reactants can come together and form products, and products can come together to re-form reactants, the reaction is called a _____ reaction.

Accepted Answer

The answer of When reactants can come together and form...

Question 6

Consider the following reversible reaction at equilibrium: CO(g)+ Cl2(g)   COCl2(g). If chlorine gas is added to the reaction vessel, the concentration of carbon monoxide will decrease.

Accepted Answer

A) True 
 B)False

Question 7

The rate of a chemical reaction increases with an increase in the concentration of one or more reactants. This is best explained by which statement?

Accepted Answer

A) The higher concentration of reactants increases the potential energy of the molecules. 
B) The higher concentration of reactants increases the activation energy of the reaction. 
C) The higher concentration of reactants increases the temperature of the molecules. 
D) The higher concentration of reactants increases the frequency of collisions between molecules. 
A) The higher concentration of reactants increases the potential energy of the molecules. 
B) The higher concentration of reactants increases the activation energy of the reaction. 
C) The higher concentration of reactants increases the temperature of the molecules. 
D) The higher concentration of reactants increases the frequency of collisions between molecules.

Question 8

For an endothermic reaction at equilibrium, increasing the temperature

Accepted Answer

A) does not shift the equilibrium since K is a constant. 
B) increases the rate of the reverse reaction to form more reactants. 
C) increases the rate of the forward reaction to form more products. 
D) increases the rate of the reverse reaction to form more products. 
A) does not shift the equilibrium since K is a constant. 
B) increases the rate of the reverse reaction to form more reactants. 
C) increases the rate of the forward reaction to form more products. 
D) increases the rate of the reverse reaction to form more products.

Question 9

Which bond is the strongest?

Accepted Answer

A) H-Br 
B) H-Cl 
C) H-F 
D) H-I 
A) H-Br 
B) H-Cl 
C) H-F 
D) H-I

Question 10

Changes in potential energy occur in chemical reactions.

Accepted Answer

A) True 
 B)False

Question 11

Consider the following reversible reaction at equilibrium: CO(g)+ Cl2(g)   COCl2(g), where $\Delta$H = -108.6 kJ. When the temperature of the reaction vessel decreases, the system responds by forming more COCl2.

Accepted Answer

A) True 
 B)False

Question 12

Bond breaking is endothermic.

Accepted Answer

A) True 
 B)False

Question 13

The larger the K for a reaction, the faster the reaction.

Accepted Answer

A) True 
 B)False

Question 14

Consider the reaction: 2 C2H6(g)+ 7 O2(g)$\rightarrow$ 4 CO2(g)+ 6 H2O(g). Increasing the concentration of C2H6(g)will decrease the activation energy.

Accepted Answer

A) True 
 B)False

Question 15

The law of conservation of energy states that

Accepted Answer

A) the energy of the reactants and products in a chemical reaction are always equal. 
B) all chemical reactions are reversible. 
C) energy can be created, but not destroyed. 
D) energy cannot be created or destroyed. 
A) the energy of the reactants and products in a chemical reaction are always equal. 
B) all chemical reactions are reversible. 
C) energy can be created, but not destroyed. 
D) energy cannot be created or destroyed.

Question 16

A manufacturing company requires 157 kJ of energy to power one of its machines for a day. The reaction shown below would be able to provide a sufficient amount of energy for this purpose.
2 HgO(s)$\rightarrow$ 2 Hg(l)+ O2(g)$\Delta$H = 182 kJ

Accepted Answer

A) True 
 B)False

Question 17

Consider the reversible reaction: PCl3(g)+ Cl2(g)   PCl5(g), where K = 0.5. Since K 5] must be less than 1 M.

Accepted Answer

A) True 
 B)False

Question 18

Ammonia (NH3)is synthesized by the reaction of nitrogen and hydrogen in the presence of an iron catalyst according to the equation below. Removing the iron catalyst would decrease the reaction rate.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following energy quantities is equivalent to 258 Cal?

Accepted Answer

A) 258 cal 
B) 1080 J 
C) 1080 kJ 
D) 6.17 × 104 kJ 
A) 258 cal 
B) 1080 J 
C) 1080 kJ 
D) 6.17 × 104 kJ

Question 20

A chemical reaction releases 55.2 kcal. How many kilojoules does this correspond to?

Accepted Answer

A) 231 kJ 
B) 0.231 kJ 
C) 13.2 kJ 
D) 1, 320 kJ 
A) 231 kJ 
B) 0.231 kJ 
C) 13.2 kJ 
D) 1, 320 kJ

Exam 6: Energy Changes, Reaction Rates, and Equilibrium

The stronger the bond, the higher its bond dissociation energy.

Consider the following reversible reaction at equilibrium: CO(g)+ Cl2(g) COCl2(g). If the pressure inside the reaction vessel is increased, the equilibrium will shift to the left.

Which of the following energy quantities is equivalent to 578 J?

In an _____ reaction, the products are lower in energy than the reactants.

When reactants can come together and form products, and products can come together to re-form reactants, the reaction is called a _____ reaction.

Consider the following reversible reaction at equilibrium: CO(g)+ Cl2(g) COCl2(g). If chlorine gas is added to the reaction vessel, the concentration of carbon monoxide will decrease.

The rate of a chemical reaction increases with an increase in the concentration of one or more reactants. This is best explained by which statement?

For an endothermic reaction at equilibrium, increasing the temperature

Which bond is the strongest?

Changes in potential energy occur in chemical reactions.

Consider the following reversible reaction at equilibrium: CO(g)+ Cl2(g) COCl2(g), where Δ\DeltaΔ H = -108.6 kJ. When the temperature of the reaction vessel decreases, the system responds by forming more COCl2.

Bond breaking is endothermic.

The larger the K for a reaction, the faster the reaction.

Consider the reaction: 2 C2H6(g)+ 7 O2(g) →\rightarrow→ 4 CO2(g)+ 6 H2O(g). Increasing the concentration of C2H6(g)will decrease the activation energy.

The law of conservation of energy states that

A manufacturing company requires 157 kJ of energy to power one of its machines for a day. The reaction shown below would be able to provide a sufficient amount of energy for this purpose. 2 HgO(s) →\rightarrow→ 2 Hg(l)+ O2(g) Δ\DeltaΔ H = 182 kJ

Consider the reversible reaction: PCl3(g)+ Cl2(g) PCl5(g), where K = 0.5. Since K < 1, [PCl5] must be less than 1 M.

Ammonia (NH3)is synthesized by the reaction of nitrogen and hydrogen in the presence of an iron catalyst according to the equation below. Removing the iron catalyst would decrease the reaction rate.

Which of the following energy quantities is equivalent to 258 Cal?

A chemical reaction releases 55.2 kcal. How many kilojoules does this correspond to?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Gases, Liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

Consider the following reversible reaction at equilibrium: CO(g)+ Cl₂(g) COCl₂(g). If the pressure inside the reaction vessel is increased, the equilibrium will shift to the left.

Consider the following reversible reaction at equilibrium: CO(g)+ Cl₂(g) COCl₂(g). If chlorine gas is added to the reaction vessel, the concentration of carbon monoxide will decrease.

Consider the reaction: 2 C₂H₆(g)+ 7 O₂(g) $\rightarrow$ 4 CO₂(g)+ 6 H₂O(g). Increasing the concentration of C₂H₆(g)will decrease the activation energy.

A manufacturing company requires 157 kJ of energy to power one of its machines for a day. The reaction shown below would be able to provide a sufficient amount of energy for this purpose. 2 HgO(s) $\rightarrow$ 2 Hg(l)+ O₂(g) $\Delta$ H = 182 kJ

Consider the reversible reaction: PCl₃(g)+ Cl₂(g) PCl₅(g), where K = 0.5. Since K < 1, [PCl₅] must be less than 1 M.

Ammonia (NH₃)is synthesized by the reaction of nitrogen and hydrogen in the presence of an iron catalyst according to the equation below. Removing the iron catalyst would decrease the reaction rate.