Matter in Our Surroundings

Question 1

Matter

Answer 1

• Anything that has mass, occupies space and whose presence can be felt.

Question 2

Particles of matter are…

Answer 2

very small.

Question 3

Particles of matter have…

Answer 3

space between them.

Question 4

Particles of matter are continuously…

Answer 4

moving.

Question 5

Particles of matter attract…

Answer 5

each other.

Question 6

Melting Point

Answer 6

The minimum temperature at which a solid melts into a liquid at atmospheric pressure.

Question 7

Boiling Point

Answer 7

The minimum temperature at which a liquid boils into a gas at atmospheric pressure.

Question 8

Latent Heat of Fusion

Answer 8

The amount of heat energy required to convert 1kg of a solid into a liquid at atmospheric pressure and at its melting point.

Question 9

Latent Heat of Vapourisation

Answer 9

The amount of heat energy required to convert 1Kg of a liquid into vapour at atmospheric pressure and at its boiling point.

Question 10

Which has more heat energy? Ice (0°C) or Water (0°C).

Answer 10

Water at 0°C has more heat energy than ice due to the heat gained by water during latent heat of fusion.

Question 11

To liquify a Gas we need…

[ Mention the pressure and temperature degree ]

Answer 11

High Pressure and Low Temperature

Question 12

Evaporation

[ Explain ]

Answer 12

• It is the phenomenon of change of liquid into vapour at any temperature below its boiling point.

Question 13

Factors affecting Evaporation

Answer 13

• increase in Surface Area
• increase in Temperature
• decrease in Humidity
• increase in Wind Speed

Question 14

Steam at 100°C is better for heating than water at 100°C.

Answer 14

Steam at 100°C has more heat as it has gained heat in the form of latent heat of vapourisation.