A physical change

A) occurs when iron rusts.

B) occurs when sugar is heated into caramel.

C) occurs when glucose is converted into energy within your cells.

D) occurs when water is evaporated.

E) occurs when propane is burned for heat.

Answer: D) occurs when water is evaporated.

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

a). iron rusts : the chemical reaction occurs by combination of iron with oxygen, thus a chemical change.

b) sugar is heated into caramel. the chemical reaction occurs by decomposition, thus a chemical change.

c) glucose is converted into energy within your cells: the chemical reaction occurs by decomposition, thus a chemical change.

d) when water is evaporated : Only the state changes and thus a physical change and cannot be reversed.

e) when propane is burned for heat: the chemical reaction as propane combines with oxygen to form carbon dioxide and water, thus a chemical change.