Heat

Question 5 • *25-26 KCS18 Chemistry IC

A baker touches a pie right after taking it out of the oven. Which statement best explains why the pie feels hot?

Answer

Molecules in the skin move faster than molecules in the pie, so heat is transferred to the pie.

Molecules in the pie move faster than molecules in the skin, so heat is transferred to the skin.

Molecules in the skin move faster than molecules in the pie, so heat is transferred to the skin.

Molecules in the pie move faster than molecules in the skin, so heat is transferred to the pie.

Explanation

The pie is hotter than the baker’s skin, so its molecules have greater average motion. When they touch, energy transfers from the hotter pie to the cooler skin, which is why the pie feels hot. Choice B correctly describes both the relative molecular motion and the direction of heat transfer.

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