Question

how does changes classified​

Answer 1

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Changes are either classified as physical or chemical changes. Chemists learn a lot about the nature of matter by studying the changes that matter can undergo. Chemists make a distinction between two different types of changes that they study - physical changes and chemical changes.

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Answer 2

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Two type of changes

1. Physical change -- When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.

Physical change is a temporary change.

Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

2. Chemical change -- When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.

A chemical change is a permanent change.

A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

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