Question

Physical and chemical changes (a comparison)

Answer 1

Explanation:

physical changes are reversible and chemical changes are irreversible

Answer 2

Answer:

Physical change.

1. Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.
2. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
3. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Chemical change.

1. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
2. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
3. Cooking pancakes, for instance, is an example of a chemical change; the pancake batter "changes" from a liquid to a solid.

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