Deck 11: Applications of Chemical Kinetics

Question 1

At which point of a first order reaction is the rate of the reaction the greatest?

A) the end
B) the middle
C) the beginning
D) the rate does not change

Answer 1

the beginning

Question 2

Consider the formation of ammonia: 2N₂+ 3H₂ → 2NH₃
Which substance has the greatest rate of formation/loss in the reaction?

A) nitrogen
B) hydrogen
C) ammonia
D) They all change at the same rate.

Answer 2

hydrogen

Question 3

Which order reaction occurs when the rate of the reaction is not influenced by the concentration?

A) zero-order
B) first-order

Answer 3

zero-order

Question 4

Which type of catalyst is in the same physical state as the reactants?

A) heterogeneous
B) homogeneous

Question 5

A body was found to have larvae of the blow fly species Phormia regina present. This species requires 16.0 hours at 26.7°C to develop from egg stage to the larva stage. How long would it take for the larva to form in a house where the thermostat as set at 23.0°C? Assume a linear relationship between the temperature and development time.

A) 3.1 hours
B) 18.7 hours
C) 38.4 hours
D) 59.2 hours

Question 6

Summarize what occurs on a chemical level to slow reaction rates as the temperature decreases.

Question 7

Which of the following is a factor that can influence the rate of a chemical reaction?

A) catalyst
B) concentration
C) energy
D) pressure
E) all of the above

Question 8

Which type of catalyst will result in a greater increase in the rate of reaction?

A) solid catalyst
B) powder catalyst

Question 9

Which of the following is not one of the three principles of the collision theory of reactions?

A) The collisions must have a sufficiently high energy for reaction to occur.
B) The colliding particles must be charged ions for a reaction to occur.
C) The molecules of the reactants must collide for a reaction to take place.
D) The colliding particles must be properly oriented for a reaction to occur.

Question 10

Explain what the term "steady state" means in relationship to a pharmaceutical drug.

Question 11

What happens to the rate of a first-order reaction when the concentration of the reactants is quadrupled?

A) the rate halves
B) the rate doubles
C) the rate quadruples
D) the rate does not change

Question 12

Which of the following is not a restriction on the three principles of the collision theory?

A) Not all collisions will result in the formation of products.
B) Only if the charged ions are present in the correct ratio will the reaction occur.
C) Each reaction has an activation energy that must be realized for a reaction to occur.
D) Only if the collision has sufficient energy and proper orientation of the colliding particles can the reaction proceed.

Question 13

True or false
A catalyst increases the rate of the reaction and is consumed as part of the reaction.

Question 14

A scientist is trying to speed up the rate of a reaction. They want the reaction rate to increase by four times. How should they change the temperature to achieve this rate increase?

A) increase the temperature by 20°C
B) increase the temperature by 40°C
C) decrease the temperature by 20°C
D) decrease the temperature by 40°C

Question 15

What is the only method of increasing the reaction rate that works by lowering the activation energy?

A) using a catalyst
B) using chemiluminescence
C) decreasing the reactant concentrations
D) increasing the temperature of the reaction

Question 16

In which phase do reactions occur most rapidly?

A) gas
B) liquid
C) solid
D) All of the phases occur at the same rate.

Question 17

What would happen to the rate of an enzyme-catalyzed reaction if the concentration of the enzyme were halved?

A) the rate halves
B) the rate doubles
C) the rate quadruples
D) the rate does not change
E) none of the above

Question 18

Consider the reaction of 1-butene (CH₃CH₂CH=CH₂) with H₂ to produce butane. Will this reaction have a lower rate than the reaction of H₂ with propene (CH₃CH=CH₂), assuming the same conditions of concentration and temperature?

Question 19

What happens to the number of molecule collisions over time in a reaction?

A) they increase
B) they decrease
C) they stay the same
D) they increase then decrease

Question 20

Determine the amount of time required for 75% of Adderall to leave a person's system, provided that the person took a single dose of 10 mg and the half-life of Adderall is approximately 9 hours.

A) 4.5 hours
B) 9 hours
C) 18 hours
D) 27 hours