Question 1

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Accepted Answer

A)  the reverse reaction will occur
B)  no reaction takes place
C)  the reaction will occur anyway
D)  the products will form at a slower rate B

Question 2

Consider the reaction A + B → C. Doubling the concentration of A leads to doubling the rate, while doubling the concentration of B quadruples the rate. The rate equation is, therefore, ________.

Accepted Answer

A)  Rate = -k[A][B]2
B)  Rate = -k[A]
C)  Rate = - k[A]2
D)  Rate = -k[A]2[B] A

Question 3

Which of the following is an endothermic reaction?

Accepted Answer

A)  melting ice
B)  freezing water
C)  sublimation of dry ice
D)  condensing water vapor A

Question 4

The magnitude (size)of the energy of activation for the reverse reaction is exactly identical as it is for the forward reaction.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is true about the activation energy?

Accepted Answer

A)  It may increase by decreasing the temperature.
B)  It may decrease by decreasing the temperature.
C)  It may increase by increasing the concentration of reactants.
D)  It is practically independent of both temperature and concentration of reactants.

Question 6

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole;
Energy of products = 75 kJ/mole;
Energy of transition state = 100 kJ/mole.
The energy of activation for the reverse reaction is ________ kJ/mole.

Accepted Answer

A)  25
B)  50.
C)  75
D)  100

Question 7

The value of Ea(reaction)is equal to the difference Ea(reactants)- Ea(products).

Accepted Answer

A) True 
 B)False

Question 8

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole;
Energy of products = 20 kJ/mole;
Energy of transition state = 60 kJ/mole.
One can say with certainty that the reaction is ________ by ________kJ/mole and the energy of activation is ________ kJ/mole.

Accepted Answer

A)  exothermic; 10; 30
B)  endothermic; 10; 30
C)  exothermic; 40; 30
D)  endothermic; 40; 30

Question 9

Given the reaction, 2A + B2 → 2AB, which of the following factors could increase the reaction rate?
I. decreasing the temperature
II.adding a catalyst
III.increasing the surface area of solid reactants

Accepted Answer

A)  I and II
B)  II and III
C)  I and III
D)  II And III
E)  III only

Question 10

In order for a chemical reaction to occur, ________.

Accepted Answer

A)  the reactants must be in sufficient concentration
B)  the products must be of lower energy than the reactants
C)  the reactants must be of lower energy than the products
D)  the reactants must possess sufficient energy to overcome the barrier of the activation energy

Question 11

A high energy of activation leads to more products favored in the reaction.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following does not affect the rate of a reaction?

Accepted Answer

A)  the concentration of the reactants
B)  the energy of activation
C)  the temperature
D)  the pressure

Question 13

Industrial chemists often have their choice of catalysts to use when designing, for example, a factory that produces ammonia. Explain why biochemists studying life processes (such as protein metabolism)do not have the same variety of choices for which enzyme they would use.

Accepted Answer

The answer of Industrial chemists often have their choice of...

Question 14

A catalyst can be recovered at the end of the reaction.

Accepted Answer

A) True 
 B)False

Question 15

The energy of activation may be affected by ________.

Accepted Answer

A)  increasing the concentration of the reactants
B)  higher temperature
C)  decreasing the concentration of the reactants
D)  the presence of a catalyst

Question 16

Which of the following may be considered as biochemical catalysts?

Accepted Answer

A)  carbohydrates
B)  DNA
C)  enzymes
D)  lipids

Question 17

-In the diagram above, the containers shown (Box A and BoxB)contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

Accepted Answer

A)  Box A
B)  Box B
C)  Rate is about the same in each box.
D)  No way to tell which is faster from this picture.

Question 18

The reaction: HCl + NaOH → H2O + NaCl is a substitution reaction.

Accepted Answer

A) True 
 B)False

Question 19

When the products are higher in energy than the reactants, the reaction is endothermic.

Accepted Answer

A) True 
 B)False

Question 20

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

Accepted Answer

A) True 
 B)False

Exam 13: When Reactants Turn Into Products

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Consider the reaction A + B → C. Doubling the concentration of A leads to doubling the rate, while doubling the concentration of B quadruples the rate. The rate equation is, therefore, ________.

Which of the following is an endothermic reaction?

The magnitude (size)of the energy of activation for the reverse reaction is exactly identical as it is for the forward reaction.

Which of the following is true about the activation energy?

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole; Energy of products = 75 kJ/mole; Energy of transition state = 100 kJ/mole. The energy of activation for the reverse reaction is ________ kJ/mole.

The value of E_a(reaction)is equal to the difference E_a(reactants)- E_a(products).

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is by kJ/mole and the energy of activation is kJ/mole.

Given the reaction, 2A + B₂ → 2AB, which of the following factors could increase the reaction rate? I. decreasing the temperature II.adding a catalyst III.increasing the surface area of solid reactants

In order for a chemical reaction to occur, ________.

A high energy of activation leads to more products favored in the reaction.

Which of the following does not affect the rate of a reaction?

Industrial chemists often have their choice of catalysts to use when designing, for example, a factory that produces ammonia. Explain why biochemists studying life processes (such as protein metabolism)do not have the same variety of choices for which enzyme they would use.

A catalyst can be recovered at the end of the reaction.

The energy of activation may be affected by ________.

Which of the following may be considered as biochemical catalysts?

-In the diagram above, the containers shown (Box A and BoxB) contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

The reaction: HCl + NaOH → H₂O + NaCl is a substitution reaction.

When the products are higher in energy than the reactants, the reaction is endothermic.

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

Exam 13: When Reactants Turn Into Products

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Consider the reaction A + B → C. Doubling the concentration of A leads to doubling the rate, while doubling the concentration of B quadruples the rate. The rate equation is, therefore, ________.

Which of the following is an endothermic reaction?

The magnitude (size)of the energy of activation for the reverse reaction is exactly identical as it is for the forward reaction.

Which of the following is true about the activation energy?

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole; Energy of products = 75 kJ/mole; Energy of transition state = 100 kJ/mole. The energy of activation for the reverse reaction is ________ kJ/mole.

The value of Ea(reaction)is equal to the difference Ea(reactants)- Ea(products).

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is ________ by ________kJ/mole and the energy of activation is ________ kJ/mole.

Given the reaction, 2A + B2 → 2AB, which of the following factors could increase the reaction rate? I. decreasing the temperature II.adding a catalyst III.increasing the surface area of solid reactants

In order for a chemical reaction to occur, ________.

A high energy of activation leads to more products favored in the reaction.

Which of the following does not affect the rate of a reaction?

Industrial chemists often have their choice of catalysts to use when designing, for example, a factory that produces ammonia. Explain why biochemists studying life processes (such as protein metabolism)do not have the same variety of choices for which enzyme they would use.

A catalyst can be recovered at the end of the reaction.

The energy of activation may be affected by ________.

Which of the following may be considered as biochemical catalysts?

-In the diagram above, the containers shown (Box A and BoxB) contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

The reaction: HCl + NaOH → H2O + NaCl is a substitution reaction.

When the products are higher in energy than the reactants, the reaction is endothermic.

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

The value of E_a(reaction)is equal to the difference E_a(reactants)- E_a(products).

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is by kJ/mole and the energy of activation is kJ/mole.

Given the reaction, 2A + B₂ → 2AB, which of the following factors could increase the reaction rate? I. decreasing the temperature II.adding a catalyst III.increasing the surface area of solid reactants

The reaction: HCl + NaOH → H₂O + NaCl is a substitution reaction.