Question

v) Most reactions are more rapid at high temperatures than at low temperatures.
This is consistent with:
(1) an increase in the activation energy with increasing temperature
(11) an increase in the rate constant with increasing temperature
(ul) an increase in the percentage of "high energy" collisions with increasing
temperature
(a) only! (b) only II (c) I and II only (d) II and UI only
(P.
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Answer 1

Most reactions are more rapid at high temperatures than at low temperatures.

This is consistent with:

(I) an increase in the activation energy with increasing temperature

II) an increase in the rate constant with increasing temperature

III) an increase in the percentage of "high energy" collisions with increasing

temperature

(a) only I AND III (b) only II (c) I and II only (d) II and III only

Answer:

The correct option is (a) only I AND III.

Explanation:

Option I is correct because an increase in temperature generally increases the activation energy required for a reaction to occur. This is because at higher temperatures, the molecules have more thermal energy and are moving faster, so it becomes more difficult for the reactant molecules to reach the activation energy threshold required for a reaction to occur.

Option III is also correct because an increase in temperature increases the kinetic energy of the molecules, leading to more frequent and energetic collisions. The percentage of high-energy collisions increases with increasing temperature because the number of high-energy collisions is proportional to the number of total collisions, which increases with temperature.

Option II is not correct because an increase in temperature generally increases the rate constant of a reaction, not the activation energy.

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