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Catalysts
Test Description: Quiz
Instructions: Answer all questions to get your test result.
1) Which is the best definition of activation energy?
A
the energy required to bind a substrate to an active site
B
the energy required to re-form bonds in product molecules
C
the energy required to end a chemical reaction
D
the energy required to break the bonds of reactant molecules
2) Which statement correctly describes a chemical reaction?
A
Energy is always released.
B
Reactants come out of a reaction.
C
Bonds between atoms break and new bonds form.
D
Products go into a reaction.
3) Which statement best describes how a catalyst can speed up a chemical reaction?
A
The catalyst increases the concentration of reactants.
B
The catalyst makes lower energy pathways available.
C
The catalyst binds to enzymes to release substrates.
D
The catalyst increases the concentration of products.
4) Which factor can decrease the rate of a chemical reaction?
A
high pressure
B
low activation energy
C
high concentration of reactants
D
low pressure
5) If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?
A
The rate would remain the same.
B
The rate would go up and down.
C
The rate would decrease.
D
The rate would increase.
6) Which reaction is exothermic?
A
a reaction that requires an activation energy
B
a reaction that absorbs energy from the environment
C
a reaction that releases energy into the environment
D
a reaction that does not involve a change in energy
7) What must happen before a chemical reaction can begin?
A
The activation energy must be reached.
B
The concentrations of products and reactants must be equal.
C
The activation energy must be exceeded.
D
The concentration of reactant molecules must be reduced.
8) Photosynthesis is an example of
A
an endothermic reaction.
B
an exothermic reaction.
C
a reaction that emits energy.
D
a reaction that gives off heat.
9) How does a catalyst work?
A
by decreasing the activation energy of a reaction
B
by increasing the temperature of a chemical reaction
C
by decreasing the pressure of a chemical reaction
D
by increasing the concentration of reactants in a reaction
10) Which component is affected when a catalyst is added to a chemical reaction?
A
the amount of product
B
the activation energy
C
the amount of substrate
D
the concentration of reactants
*select an answer for all questions
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