11
AssignmentMultiple Choice

Stoichiometric Calculations

Question 11 • LA-Chemistry A

Based on this information, what is the most likely reason that refrigerating most foods reduces the rate at which they spoil?

Answer
A
The lower temperature causes foods to expand, increasing the distances between molecules and reducing the reaction rate.
B
The lower temperature reduces molecule speeds, reducing the number of effective collisions.
C
The lower temperature causes food to contract, increasing the distances between molecules and reducing the reaction rate.

Explanation

Refrigeration lowers the temperature of food, so its molecules move more slowly. Slower-moving molecules collide less often with enough energy to cause chemical reactions, including reactions that contribute to spoilage. Therefore, the best choice is “The lower temperature reduces molecule speeds, reducing the number of effective collisions.”

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