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Free CLEP Science and Mathematics Exam Braindumps (page: 35)

Page 34 of 128
PDF with 494 Questions

Exists as a liquid at SIR

  1. H2O
  2. H2S
  3. H2Se
  4. H2Te
  5. HCl

Answer(s): A

Explanation:

Water has the highest boiling point as a result of hydrogen bonding. All other species listed are gases at STP.



2A + B C

The experimental rate law for the hypothetical exothermic reaction above at 25° C is:

Rate = k[A]2[B]

What is the overall order of the above reaction?

  1. 0
    In addition, the concentration of B is raised to the first power, thus the reaction is first order with respect to
  2. 1
    The overall order of a reaction is the sum of the orders with respect to the reactants. Therefore, the order is 3.
  3. 2
  4. 3
  5. 4

Answer(s): D

Explanation:

The rate law given shows the concentration of A raised to the second power, therefore it is second order with respect to reactant A. In addition, the concentration of B is raised to the first power, thus the reaction is first order with respect to B. The overall order of a reaction is the sum of the orders with respect to the reactants. Therefore, the order is 3.



2A + B C

The experimental rate law for the hypothetical exothermic reaction above at 25° C is:

Rate = k[A]2[B]

According to the rate law of the reaction, doubling the concentration of reactant A has what effect on the reaction at 25° C?

  1. The rate of reaction is twice as fast.
    Doubling the concentration of reactant A results in quadrupling the rate of reaction
  2. The rate of reaction is twice as slow.
  3. The rate of reaction is four times as fast.
  4. The rate of reaction is four times as slow.
  5. The rate of reaction is not affected.

Answer(s): C

Explanation:

The rate law shows that the rate of reaction is second order with respect to reactant

A. Doubling the concentration of reactant A results in quadrupling the rate of reaction



2A + B C

The experimental rate law for the hypothetical exothermic reaction above at 25° C is:

Rate = k[A]2[B]

Running the reaction at 50° C, results in which of the follow?

  1. The reaction shifts to the right.
  2. The reaction shifts to the left.
  3. The rate of reaction is twice as fast.
  4. The rate of reaction is twice as slow.
  5. No change is observed.

Answer(s): B

Explanation:

An exothermic reaction produces heat, thus adding heat shifts the reaction to the reactants. Temperature has no affect on reaction rate.






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