Question

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? O The molecules move more quickly and their average kinetic energy increases. O The molecules move more slowly and their average kinetic energy decreases O The molecules move more quickly and their average kinetic energy decreases. O The molecules move more slowly and their average kinetic energy increases.​

Answer 1

Explanation:

The molecules move more slowly and their average kinetic energy decreases

Answer 2

The molecules move more slowly and their average kinetic energy decreases. Hence, option B is correct.

What is the molecular level?

On the molecular level, the individual chemical bonds in the substance are not altered; hence, a phase change is not a chemical reaction.

At the molecular level, the temperature is related to the random motions of the particles (atoms and molecules) in matter.

Because there are different types of motion, the particles' kinetic energy (energy of motion) can take different forms, and each form contributes to the total kinetic energy of the particles.

Hence, option B is correct.

Learn more about the molecular level here:

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