Chapter 15: Q3CT (page 636)
Many modern refrigerators have an internal temperate of 45℉. What if refrigerators were set at 55℉ in the factory? How would this affect our lives?
The food will spoil within hours.
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The decomposition of Hydrogen Iodide on finely divided gold atis zero order with respect to HI. The rate defined below is constant at .
(a) If the initial HIconcentration was, calculate the concentration ofHI at 25minutes after the start of the reaction.
(b) How long will it take for all of the 0.250 MHIto decompose?
Define reaction rate. Distinguish between the initial rate, average rate, and instantaneous rate of a chemical reaction. Which of these rates is usually fastest? The initial rate is the rate used by convention. Give a possible explanation as to why.
Describe at least two experiments you could perform to determine a rate law.
The activation energy for a certain uncatalyzed biochemical reaction is 50.0 kJ/mol. In the presence of a catalyst at 37 ⁰C, the rate constant for the reaction increases by a factor of 2.50 × 103 as compared with the uncatalyzed reaction. Assuming that the frequency factor A is the same for both the catalysed and uncatalyzed reactions, calculate the activation energy for the catalysed reaction
For the following reaction profiles, indicate
a. The positions of reactants and products.
b. The activation energy.
c. E for the reaction.
d. The second reaction profile is representative of a reaction that occurs by a two-step mechanism. Which point on the plot represents the energy of the intermediate in the two-step reaction? Which step in the mechanism is rate-determining, the first or the
second step? Explain.
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