Problem: The density of iron decreases as temperature increases (as does the density of most substances). Which statement accurately describes the changes in a sample of iron when it is warmed from room temperature to 95°?(a) The sample becomes lighter.(b) The sample becomes heavier.(c) The sample expands.(d) The sample contracts. 

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iron → metal

metal → expands when heated


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Problem Details

The density of iron decreases as temperature increases (as does the density of most substances). Which statement accurately describes the changes in a sample of iron when it is warmed from room temperature to 95°?

(a) The sample becomes lighter.

(b) The sample becomes heavier.

(c) The sample expands.

(d) The sample contracts. 

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Based on our data, we think this problem is relevant for Professor Evans' class at USF.