10
QuizMultiple Choice

Heat

Question 10 • *25-26 KCS18 Chemistry IC

A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?

Answer
A
Molecules in both the metal and the surrounding air will start moving at lower speeds.
B
Molecules in both the metal and the surrounding air will start moving at higher speeds.
C
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
D
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.

Explanation

Thermal energy moves from the hotter metal plate to the cooler surrounding air. As the plate loses energy, its particles move more slowly, while the air molecules gain energy and move faster. This matches choice D: the surrounding air molecules speed up, and the molecules in the metal slow down.

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