Which of the following statements about a catalyst is true?
question 14 options:

a catalyst can be changed chemically during a reaction.

a catalyst can accelerate the rate of a reaction.

a catalyst can initiate a reaction.

a catalyst can be consumed during a reaction.
question 15 (4 points)
which of the following statements about a catalyst is true?
question 15 options:

a catalyst can initiate a reaction.

a catalyst can accelerate a reaction.

a catalyst can be consumed during a reaction.

a catalyst can be changed during a reaction.
question 16 (4 points)
according to the rate law, the reaction rate is directly proportional to the molar concentration of the reactant.
question 16 options:
true
false
question 17 (4 points)
a(n) exists in the same physical state as that of the reaction it catalyzes.
question 17 options:

heterogeneous catalyst

homogeneous catalyst

inhibitor

product
question 18 (4 points)
most chemical reactions consist of sequences of two or more simpler reactions.
question 18 options:
true
false
question 19 (4 points)
the potential energy of an activated complex is at a maximum.
question 19 options:
true
false
question 20 (4 points)
if a collision between molecules is very gentle, the molecules are
question 20 options:

more likely to be oriented favorably.

less likely to be oriented favorably.

likely to react.

likely to rebound without reacting.
question 21 (4 points)
chemists can change the rate of a reaction by changing the concentrations of the reactants.
question 21 options:
true
false
question 22 (4 points)
which of the following factors does not affect the rate of reaction?
question 22 options:

the size of the container used.

the temperature at which the reaction is carried out.

the amount of the reactants.

the physical state of the reactants.
question 23 (4 points)
a/an is a substance that slows down the rate of a reaction.
question 23 options:

catalyst

inhibitor

reactant

product
question 24 (4 points)
the upward-sloped straight line of the graph below indicates which type of relationship between the concentration of h2o2 and the initial reaction rate?

question 24 options:

indirect

direct

absolute

inverse
question 25 (4 points)
the rate of a chemical reaction is defined as the change in concentration of a reactant or product in a given time interval.
question 25 options:
true
false

10 of 25 questions saved