Question

any two ways to bring about a change in a substance

Answer 1

Chemical changes:
1. add an acid or Base or salt
2.Any reaction to its composition
Physical change:
1. heating or melting
2.shape by stretching.

Answer 2

Any two ways to bring about a change in a substance are given below:

1. Change due to temperature

We can bring about a change in substance by increasing the temperature. For instance: by raising temperature, we can change a solid form to liquid form.

When we heat water in high temperature, it changes into vapour form. Thus, we can say that a change has been brought in water due to which its form has changed into gaseous form.

2. Change due to chemical mixing

A change can also be brought by mixing two or more chemicals together. For example: by mixing sodium chemical with chloride, there occurs change in composition which results in the formation of Sodium chloride salt.

When we mix 2 molecules of hydrogen with 1 molecule of oxygen, it results in the formation of water molecule.

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