12
QuizMultiple Choice

Lab: Enthalpy — Unit test

Question 12 • Foothill-B Period-Chemistry-26/27B

An ice cube is dropped into a glass of milk at 20°C. Which statement explains the transfer of kinetic energy (KE)?

Answer
A
Because milk has higher KE than ice, KE is transferred from the milk to the molecules of ice.
B
Because milk has higher KE than ice, KE is transferred from the molecules of ice to the milk.
C
Because ice has higher KE than milk, KE is transferred from the milk to the molecules of ice.
D
Because ice has higher KE than milk, KE is transferred from the molecules of ice to the milk.

Explanation

Temperature reflects the average kinetic energy of particles. The milk at 20°C is warmer than the ice, so its particles have greater average kinetic energy. Energy transfers from the warmer milk to the colder ice until they move toward thermal equilibrium; therefore, the correct choice is “Because milk has higher KE than ice, KE is transferred from the milk to the molecules of ice.”

AI-written and checked against the verified answer.

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