Question

Explain the physical and chemical changes with two examples.​

Answer 1

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PHYSICAL CHANGE :-

A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Physical changes can further be classified as reversible or irreversible. The melted ice cube may be refrozen, so melting is a reversible physical change.

An example of a physical change is the process of tempering steel to form a knife blade.

CHEMICAL CHANGE :-

A chemical change occurs when a new substance is formed through a chemical reaction like when fruit ripens or rots. When something undergoes a "chemical reaction" and a new substance is formed as a result, we call this chemical change.

For example, burned wood becomes ash, carbon dioxide, and water. When exposed to water, iron becomes a mixture of several hydrated iron oxides and hydroxides.

Answer 2

Answer:

Physical changes: are changes affecting the form of a chemical substance, but not it's chemical composition. 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.

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

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. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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