Question

5. The process of conversion of water into water vapour is called condensation.
6. Tearing a piece of paper is a fast change.
7. Leaves are the food factories of the plants.
8. Physical change can be reversed easily.
9. A piece of iron will float on the water surface.
10. The breaking of wood is a physical change.​

Answer 1

Explanation:

ANSWER

The process of changing water vapour into water is called condensation.

Condensation is simply the process of change of the vapour from gaseous state to liquid when comes in contact of cool surface.

And this process can't be boiling as in boiling we have to provide heat and it is the change of liquid state into vapour form.

And the process is not evaporation as it also changes water into vapour.

Melting is not the required process as it is the change of state from solid to liquid.

Answer 2

5. False

6. True

7. True

8. True

9. False

10. True

Explanation:

• Process of conversion of water into water vapour is called evaporation. Condensation is the process where gas phase is changed into liquid phase. Water vapour is converted into liquid water in condensation.

• Tearing a piece of paper of paper is a fast change. Fast change is when the outcome takes a long time to show up. When a paper is torn, the tearing happens in just a short period of time.

• Leaves of plant is where the photosynthesis taking place. Photosynthesis is the process by which plants prepare their own food.

• Physical change involves change in state of shape or size of any matter. There is no new substance formed during the change. And state change is reversible.

• Floating happens when the object's density is less than the fluid it is kept in. Here, density of iron is greater than that of water so it will sink and no float.

• Breaking of wood does not involve any formation of new substance and so it is a physical change.