Question

1. Give two examples for each of the following:

(b) Substances which do not change their state.

Answer 1

Some substances do not change their state.

• Nitrogen is the main component in our atmosphere which is present in gaseous form, it does not change its state to any other state. It usually remains in gaseous form
• Oxygen is also an important component in our atmosphere, it is also present in the form of gas and it does not change their state
• Hydrogen is also another example that does not change its state.