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17 Cards in this Set
- Front
- Back
- 3rd side (hint)
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List the 5 factors that affect the rate of a reaction.
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1. nature of the reactants
2. surface area exposed 3. concentrations 4. temperatures 5. presence of a catalyst |
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The addition of a catalyst to a reaction.
A. changes the enthalpy. B. changes the entropy. C. changes the nature of the products. D. changes the activation energy. |
D. changes the activation energy.
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An increase in concentration:
A. is related to the number of collisions directly. B. is related to the number of collisions inversely. C. has no effect on the number of collusions. |
A. is related to the number of collisions directly.
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At the beginning of a reaction, the reaction rate for the reactants is:
A. largest, then decreasing. B. largest and remains constant. C. smallest, then increasing. D. smallest and remains constant. |
A. largest, then decreasing.
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The measurement of reaction rate is based on:
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1. the rate of appearance of a product or
2. the rate of disappearance of a reactant. |
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Define catalyst.
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Catalyst:
a substance that is introduced into a reaction to either speed up or slow down the reaction. |
This is accomplished by changing the amount of activation energy needed.
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What law states
the rate of a chemical reaction is proportional to the product of the concentrations of the reactants? |
Law of Mass Action
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Some reactions do not occur directly between the reactants,
but may go through intermediate steps to get to: |
the final product.
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The series of steps by which the reacting particles rearrange themselves
to form the products of a chemical reaction is called the: reaction mechanism. |
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The set of assumptions regarding collisions of particles and
the reactions that result from those collisions is known as the: |
Collision Theory.
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The Collision Theory makes the assumption that, for a reaction to occur,
there must be collisions between the reacting species. Therefore, the rate of reaction depends upon two factors: 1. the number of collisions per unit time. 2. the fraction of these collisions that are successful because enoufh energy is involved. |
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For the reaction A + B >><< C + D,
the equilibrium constant can be expressed as: A. Ke = [A] [B] --------- [C] [D] B. Ke = [C] [B] --------- [A] [D] C.Ke = [C] [D] --------- [A [B] D. Ke = C - D --------- A - B |
C.Ke = [C] [D]
--------- [A ] [B] |
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The concentrations in an expression of the equilibrium constant are given in:
A. mol/mL B. g/L C. gram-equivalents/L D. mol/L |
D. mol/L
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The pH of a solution that has a hydrogen ion concentration of 1 10 to the -4th power mol/L is:
A. 4 B. -4 C. 10 D. -10 |
C. 10
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A small value for Ke, the equilibrium constant, indicates that:
A. the concentration of the un-ionized molecules must be relatively small compared to the ion concentrations. B. the concentration of the ionized molecules must be larger than the ion concentrations. C. the substance ionized to a large degree. D. the concentration of the un-ionized molecules must be relatively large compared to the ion concentration. |
D. the concentration of the un-ionized molecules must be relatively large
compared to the ion concentration. |
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A change in which of these conditions will change the "K" of an equilibrium?
A. temperature B. pressure C. concentration of reactants D. concentration of products |
A. temperature
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If Ca(OH) is dissolved in a solution of NaOH,
its solubility, compared to that in pure water, is: A. increased B. decreased C. unaffected |
B. decreased
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In the Haber process for making ammonia,
an increase in pressure favors: A. the forward reaction. B. the reverse reaction. C. neither reaction. |
B. the forward reaction.
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The difference between HCl and HC2H3O2 as acids is:
A. the first has less hydrogen in solution. B. the second has more ionized hydrogen. C. the first is highly ionized. D. the second is highly ionized. |
C. the first is highly ionized.
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