Question

What effect does a decrease in temperature have on the overall rate of a chemical reaction??

A decreased in temperature decreases ( BLANK A). The reaction rate will ( BLANK B).


choices for Blank A:
A. the activation energy of the reaction.
B. the number of collisions between molecules.
C. the number of products in the mixture.

CHOICES FOR BLANK B:
A. decrease
B. increase
C. remain constant

Answer 1

Change in temperature affects the rate of reaction since it causes a change in the number of collisions per unit time. These collisions cause the breaking of bonds and formation of new ones giving out new products. An increase in temperature increases the rate of collisions hence increasing the rate of reaction while a decrease in temperature leads to a decrease in the rate of reaction due to the decreased number of collisions per unit time. thus the correct choice for blank A is: B. the number of collisions between molecules and for blank B: decrease.

Answer 2

A decrease in temperature changes "the number of collisions between molecules. The reaction rate will decrease.

Blank A: "the number of collisions between molecules.

Blank B: decrease.

An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction, so the rate of the reaction increases. Similarly, the rate of reaction will decrease with a decrease in temperature.