What is matter?

2

(a)

Sodium salt and sugar have similar appearance.Why are these classified as different substances?

2

(a)

In what ways air can be considered as matter?

2

(a)

Why is the rate of diffusion faster in gases.

2

(a)

How does the rate of diffusion change with
(i) density of liquid and
(ii) temperature?
Give examples.

2

(a)

How do you differentiate between solids, liquids and gases on the basis of their melting points and boiling points?

2

(a)

What property of the gas is utilized when natural gas is supplied for vehicles?

2

(a)

How is pressure developed in a container full of a gas?

2

(a)

A diver is able to cut through water in a swimming pool.Which property of matter does this observation show?

2

(a)

Ramesh took two beakers A and B containing hot water and cold water respectively. In each beaker, he dropped a crystal sulphate. He kept the beakers undisturbed. After some time what did he observe? Why?

2

(a)

You can easily move a glass rod through water in a beaker.We cannot move the rod through a stone.Explain.

2

(a)

It is not proper to regard the gaseous state of ammonia as vapours.Explain.

2

(a)

How do you differentiate between a gas and a vapour?

2

(a)

Suggest a method to liquefy atmospheric gases.

2

(a)

What produces more severe burns, boiling water or steam?

2

(a)