Question

change 2. Give an example each of a useful physical change and chemical change. Explain how they are useful.​

Answer 1

Answer:

please give me Brainliset answer

Explanation:

Diesel required for 594km =108 litres

Diesel require for 1km =108/594=2/11 litre

Therefore, diesel required for 1650km =2/11×1650=300 litres

Answer 2

Physical Change: Properties like size, shape, state (solid, liquid or gas), temperature, pressure etc., are physical properties. Those changes in which only physical properties of a substance changes are called physical changes. For example, lightening of bulb is a physical change.

Chemical Change: The change in which new substance is formed and chemical composition of a substance is changed is called a chemical change. A substance loses its identity in a chemical change and cannot be get back into its original form. For example, burning of candle, formation of curd etc.