Question

Select the option which describes the main difference between a physical and chemical change.

Physical changes only occur in water. Chemical changes occur in all other substances except water.
Chemical changes only occur in water. Physical changes occur in all other substances except water.
Chemical changes are the same atomic structure before and after the change. Where physical changes
change molecules and rearrange atoms so there are new substances present after the change.
Physical changes are the same atomic structure before and after the change. Where chemical changes
change molecules and rearrange atoms, so there are new substances present after the change.

Answer 1

A physical change preserves the atomic structure of a substance, while a chemical change involves rearrangement of molecules and atoms to form new substances.

Step-by-step explanation:

The main difference between a physical and chemical change lies in the nature of the changes that occur. In a physical change, the atomic structure of the substance remains the same before and after the change, while the molecules rearrange to form new substances. On the other hand, in a chemical change, the molecules and atoms themselves are rearranged, resulting in the formation of entirely new substances.

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