Which answer includes all the following that are chemical changes and not physical changes? I. freezing of water II. rusting of iron III. dropping a piece of iron into hydrochloric acid (H2 is produced) IV. burning a piece of wood V. emission of light by a kerosene oil lamp

Chemical changes would include the rusting of iron, dropping a piece of iron into hydrochloric acid, burning a piece of wood, and the emission of light by a kerosine oil lamp.

Chemical changes are irreversible changes leading to the formation of new products. Physical changes, on the other hand, are reversible in that no new products are formed.

The only process that is reversible in the illustration is the freezing of water. Frozen water can be retrieved by allowing the ice to melt. All other changes in the illustration are chemical changes.

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rusting of iron

dropping a piece of iron into hydrochloric acid (H2 is produced)

burning a piece of wood

emission of light by a kerosene oil lamp

Explanation:

A chemical change is not easily reversible, a new substance is formed and it often involves absorption or evolution of heat.

All the processes listed above are chemical changes. How ever, freezing of water is a physical change. It is easily reversible and no new substance is formed.

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