Question 1

The difference in energy between the reactants and the transition state is called the energy of activation, symbolized by Ea.

Accepted Answer

A) True 
 B)False

Question 2

Chemical reactions are considered favorable if the products have a higher energy than the reactants.

Accepted Answer

A) True 
 B)False

Question 3

When the equilibrium constant for a reaction is much less than one (K < 1), the concentration of the products is larger than the concentration of the reactants.

Accepted Answer

A) True 
 B)False

Question 4

In the energy diagram shown below, the $\Delta$H of the reaction is labeled by D.

Accepted Answer

A) True 
 B)False

Question 5

Consider the reversible reaction: CO(g)+ Cl2(g)   COCl2(g). The reverse reaction is COCl2(g)$\rightarrow$ CO(g)+ Cl2(g).

Accepted Answer

A) True 
 B)False

Question 6

An enzyme contains a region called its _____ that binds a reactant, which then undergoes a very specific reaction with an enhanced rate.

Accepted Answer

The answer of An enzyme contains a region called its...

Question 7

When the pressure of a reaction at equilibrium decreases, in which direction does the equilibrium shift?

Accepted Answer

A) The equilibrium shifts in the direction that increases the number of moles of gas. 
B) The equilibrium shifts in the direction that decreases the number of moles of gas. 
C) The equilibrium does not shift. 
D) The equilibrium shifts always shifts to the right. 
E) The equilibrium shifts always shifts to the left. 
A) The equilibrium shifts in the direction that increases the number of moles of gas. 
B) The equilibrium shifts in the direction that decreases the number of moles of gas. 
C) The equilibrium does not shift. 
D) The equilibrium shifts always shifts to the right. 
E) The equilibrium shifts always shifts to the left.

Question 8

Consider the reaction, C2H4(g)+ H2(g)$\rightarrow$C2H6(g), where $\Delta$H = -137 kJ. How many kilojoules are released when 3.5 mol of C2H4 reacts?

Accepted Answer

A) 137 kJ are released 
B) 570 kJ are released 
C) 480 kJ are released 
D) 2.0 × 103 kJ are released 
A) 137 kJ are released 
B) 570 kJ are released 
C) 480 kJ are released 
D) 2.0 × 103 kJ are released

Question 9

Which of the following energy quantities is equivalent to 11.9 kcal?

Accepted Answer

A) 1.19 × 105 cal 
B) 49.8 J 
C) 49.8 kJ 
D) 2.84 × 103 kJ 
A) 1.19 × 105 cal 
B) 49.8 J 
C) 49.8 kJ 
D) 2.84 × 103 kJ

Question 10

A reversible reaction has reached equilibrium when which condition is established?

Accepted Answer

A) the reverse reaction begins to occur 
B) the concentrations of reactants and products become equal 
C) all of the reactants have been converted into products 
D) the forward and reverse reaction rates become equal 
A) the reverse reaction begins to occur 
B) the concentrations of reactants and products become equal 
C) all of the reactants have been converted into products 
D) the forward and reverse reaction rates become equal

Question 11

Activation energy is the minimum amount of energy necessary for a reaction to occur.

Accepted Answer

A) True 
 B)False

Question 12

In the reaction: 2 C2H6(g)+ 7 O2(g)$\rightarrow$ 4 CO2(g)+ 6 H2O(g), increasing the concentration of C2H6(g)will

Accepted Answer

A) increase the activation energy of the reaction. 
B) decrease the activation energy of the reaction. 
C) decrease the $\Delta$H of the reaction. 
D) increase the reaction rate. 
E) decrease the reaction rate. 
A) increase the activation energy of the reaction. 
B) decrease the activation energy of the reaction. 
C) decrease the $\Delta$H of the reaction. 
D) increase the reaction rate. 
E) decrease the reaction rate.

Question 13

The molecular art depicts the following reversible reaction at equilibrium: CO(g)+ Cl2(g)   COCl2(g). What can be inferred about the equilibrium constant, K, for this reaction?

Accepted Answer

A) K  1 
D) K = 0 
A) K  1 
D) K = 0

Question 14

Consider the reversible reaction at equilibrium: N2(g)+ O2(g)   2 NO(g). What is the effect of removing some N2(g)from the equilibrium system?

Accepted Answer

A) the concentration of O2(g)increases 
B) the concentration of O2(g)decreases 
C) the concentration of NO(g)increases 
D) the equilibrium system shifts to the right 
A) the concentration of O2(g)increases 
B) the concentration of O2(g)decreases 
C) the concentration of NO(g)increases 
D) the equilibrium system shifts to the right

Question 15

A chemical reaction requires 31.39 kJ. How many kilocalories does this correspond to?

Accepted Answer

A) 7, 502 kcal 
B) 7.502 kcal 
C) 131.3 kcal 
D) 0.1313 kcal 
E) 31.39 kcal 
A) 7, 502 kcal 
B) 7.502 kcal 
C) 131.3 kcal 
D) 0.1313 kcal 
E) 31.39 kcal

Question 16

As a general rule, a reaction rate _____ for each 10 °C the temperature is raised.

Accepted Answer

The answer of As a general rule, a reaction rate...

Question 17

Enzymes are proteins that act as biological catalysts.

Accepted Answer

A) True 
 B)False

Question 18

Increasing the concentration of the reactants in a chemical reaction increases the number of collisions, and the reaction rate increases.

Accepted Answer

A) True 
 B)False

Question 19

Reactions with high Ea are generally fast reactions.

Accepted Answer

A) True 
 B)False

Question 20

When $\Delta$H is negative, the bonds formed in the products are _____ than the bonds broken in the reactants.

Accepted Answer

The answer of When $\Delta$H is negative, the bonds formed...

Exam 6: Energy Changes, Reaction Rates, and Equilibrium

The difference in energy between the reactants and the transition state is called the energy of activation, symbolized by Ea.

Chemical reactions are considered favorable if the products have a higher energy than the reactants.

When the equilibrium constant for a reaction is much less than one (K < 1), the concentration of the products is larger than the concentration of the reactants.

In the energy diagram shown below, the Δ\DeltaΔ H of the reaction is labeled by D.

Consider the reversible reaction: CO(g)+ Cl2(g) COCl2(g). The reverse reaction is COCl2(g) →\rightarrow→ CO(g)+ Cl2(g).

An enzyme contains a region called its _____ that binds a reactant, which then undergoes a very specific reaction with an enhanced rate.

When the pressure of a reaction at equilibrium decreases, in which direction does the equilibrium shift?

Consider the reaction, C2H4(g)+ H2(g) →\rightarrow→ C2H6(g), where Δ\DeltaΔ H = -137 kJ. How many kilojoules are released when 3.5 mol of C2H4 reacts?

Which of the following energy quantities is equivalent to 11.9 kcal?

A reversible reaction has reached equilibrium when which condition is established?

Activation energy is the minimum amount of energy necessary for a reaction to occur.

In the reaction: 2 C2H6(g)+ 7 O2(g) →\rightarrow→ 4 CO2(g)+ 6 H2O(g), increasing the concentration of C2H6(g)will

The molecular art depicts the following reversible reaction at equilibrium: CO(g)+ Cl2(g) COCl2(g). What can be inferred about the equilibrium constant, K, for this reaction?

Consider the reversible reaction at equilibrium: N2(g)+ O2(g) 2 NO(g). What is the effect of removing some N2(g)from the equilibrium system?

A chemical reaction requires 31.39 kJ. How many kilocalories does this correspond to?

As a general rule, a reaction rate _____ for each 10 °C the temperature is raised.

Enzymes are proteins that act as biological catalysts.

Increasing the concentration of the reactants in a chemical reaction increases the number of collisions, and the reaction rate increases.

Reactions with high Ea are generally fast reactions.

When Δ\DeltaΔ H is negative, the bonds formed in the products are _____ than the bonds broken in the reactants.

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

The difference in energy between the reactants and the transition state is called the energy of activation, symbolized by E_a.

In the energy diagram shown below, the $\Delta$ H of the reaction is labeled by D. $In the energy diagram shown below, the \Delta H of the reaction is labeled by D.$

Consider the reversible reaction: CO(g)+ Cl₂(g) $Consider the reversible reaction: CO(g)+ Cl<sub>2</sub>(g) COCl<sub>2</sub>(g). The reverse reaction is COCl<sub>2</sub>(g) \rightarrow CO(g)+ Cl<sub>2</sub>(g).$ COCl₂(g). The reverse reaction is COCl₂(g) $\rightarrow$ CO(g)+ Cl₂(g).

Consider the reaction, C₂H₄(g)+ H₂(g) $\rightarrow$ C₂H₆(g), where $\Delta$ H = -137 kJ. How many kilojoules are released when 3.5 mol of C₂H₄reacts?

In the reaction: 2 C₂H₆(g)+ 7 O₂(g) $\rightarrow$ 4 CO₂(g)+ 6 H₂O(g), increasing the concentration of C₂H₆(g)will

The molecular art depicts the following reversible reaction at equilibrium: CO(g)+ Cl₂(g) COCl₂(g). What can be inferred about the equilibrium constant, K, for this reaction?

Consider the reversible reaction at equilibrium: N₂(g)+ O₂(g) 2 NO(g). What is the effect of removing some N₂(g)from the equilibrium system?

Reactions with high E_a are generally fast reactions.

When $\Delta$ H is negative, the bonds formed in the products are _____ than the bonds broken in the reactants.