Matching (Value 5)
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Match each item with the correct statement below. a. | activated complex | d. | activation energy | b. | reaction rate | e. | rate | c. | inhibitor |
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1.
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the minimum energy colliding particles must have in order to react
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2.
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arrangement of atoms at the peak of an energy barrier
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3.
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the number of atoms, ions, or molecules that react in a given time to form
products
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4.
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a substance that interferes with a catalyst
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5.
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amount of reactant changing per unit of time (kg/sec) (single word)
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Multiple Choice (Value 11) Identify the choice that best completes the statement or answers
the question.
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6.
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Which expression represents a reaction rate?
a. | time/mass | c. | energy/time | b. | number/time | d. | time/energy |
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7.
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Another name for the activated complex is ____.
a. | energy barrier | c. | rate limiter | b. | transition state | d. | collision group |
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8.
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At what stage of a reaction do atoms have the highest energy?
a. | reactant stage | b. | product stage | c. | transition state
stage | d. | The stage of highest energy depends on the atom. |
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9.
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Activation energy is ____.
a. | the heat released in a reaction | b. | an energy barrier between reactants and
products | c. | the energy given off when reactants collide | d. | generally very high
for a reaction that takes place rapidly |
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10.
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Why does a higher temperature cause a reaction to go faster?
a. | There are more collisions per second only. | b. | Collisions occur
with greater energy only. | c. | There are more collisions per second and the
collisions are of greater energy. | d. | There are more collisions per second or the
collisions are of greater energy. |
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11.
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Why does a higher concentration make a reaction faster?
a. | There are more collisions per second only. | b. | Collisions occur
with greater energy only. | c. | There are more collisions per second and the
collisions are of greater energy. | d. | There are more collisions per second or the
collisions are of greater energy. |
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12.
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Why does a catalyst cause a reaction to proceed faster?
a. | There are more collisions per second only. | b. | The collisions occur
with greater energy only. | c. | The activation energy is lowered
only. | d. | There are more collisions per second and the collisions are of greater
energy. |
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13.
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What happens to a catalyst in a reaction?
a. | It is unchanged. | c. | It is incorporated into the reactants. | b. | It is incorporated
into the products. | d. | It
evaporates away. |
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14.
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A catalyst works by ____.
a. | lowering the activation energy barrier | b. | shifting the equilibrium position toward the
products | c. | changing the temperature of the reactants | d. | changing the
particle size of the reactants |
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15.
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The rate of a chemical reaction normally ____.
a. | decreases as temperature increases | b. | is slowed down by a
catalyst | c. | increases as reactant concentration increases | d. | decreases as
reactant concentration increases |
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16.
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Which of the following substances act as catalysts in the body?
a. | carbohydrates | c. | lipids | b. | nucleic acids | d. | enzymes |
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Essay (Value 4)
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17.
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Explain the effects of reactant concentration and particle size on the rate of a
reaction.
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18.
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What is the effect of a catalyst on the rate of a reaction? Give an example of a
catalyst.
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