Question

Write down any two ways by which we can bring about changes. Give an example of each​

Answer 1

Answer:

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

example: Rusting of iron in presence of moisture and oxygen.

                Burning of wood.

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

example: Crushing a can.

                Melting an ice cube.

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