Question

Explain why a substance expands on heating.

(HINT: You must link your answer to the molecules present in the substances)

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Answer 1

Answer:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.