Question

Which type of change take place in the
following and state whether the energy is
evolved or absorbed during the change?
1. Burning of a candle
2. Lightening of a bulb
3. Preparation of food by green plants​

Answer 1

Answer:

POINTS TO REMEMBER

Changes are taking place rapidly in our surrounding. All those changes are broadly classified into two types-i.e., physical change and chemical change.

Physical properties: Properties such as shape, size, colour and state of substance are called its physical properties.

Physical change: A change in which substance undergoes a change in its physical properties is called a physical change.

(a) Stretching of spring (b) Change is states of water

Answer 2

Explanation:

1.burning of candle is a chemical change.energy is evolved.

2.lightening of bulb is a physical changes.energy is evolved.

3.preparation of food by green plants is a chemical changes.energy is absorbed during the change.