Which states of matter are being described here? Complete the table. The first example has been done for you. Description State or states Occupies a fixed volume Solid, liquid Evaporates to become a gas Takes the shape of its container Has a fixed volume May become a liquid when its temperature changes

Solid: It is the state of matter which has fixed volume and shape. Liquid: It is the state of matter which has only fixed volume but not shape. It takes the shape of the container. Gas: Gases do not have fixed volume and fixed shape. They move all the time around. Evaporation: It is the process of converting liquid into gas below its boiling point. It takes at all temperatures. Melting point: It is the temperature at which the solid converts into liquid. Boiling point: It is the temperature at which the liquid converts in to gas through heating process. Condensation: It is the process of converting gas into liquid by cooling process. Description State or states Occupies a fixed volume Solid, liquid Evaporates to become a gas Liquid Takes the shape of its container Liquid Has a fixed volume Solid, liquid May become a liquid when its temperature changes Solid, gas

Match the following: Column A Column B (a) Molecules (i) Water boils (b) 100 ° C (ii) Evaporation (c) 0 ° C (iii) Changes from solid to gas (d) At all temperatures (iv) Matter (e) Camphor (v) Water freezes

(a) Molecules - (iv) Matter Anything which occupies space and has mass is called matter. All forms of matter are composed of molecules. (b) 100 ο C - (i) Water boils The temperature at which liquid changes into vapour without further increase in temperature is called the boiling point of the liquid. The boiling point of water is 100 ο C . (c) 0 ο C - (v) Water freezes The temperature at which a liquid changes into solid without further decrease in temperature is called the freezing point of the liquid. The freezing point of water is 0 ο C . (d) At all temperatures - (ii) Evaporation The change of state from liquid to vapour at all temperatures from the surface of liquid is called evaporation. Evaporation takes place at all temperatures. (e) Camphor - (iii) Changes from solid to gas Sublimation is the process by which a solid when heated, directly changes into its vapour (gaseous state) without first changing into liquid. Camphor is a substance which exhibits sublimation. Column A Column B (a) Molecules (iv) Matter (b) 100 ° C (i) Water boils (c) 0 ° C (v) Water freezes (d) At all temperatures (ii) Evaporation (e) Camphor (iii) Changes from solid to gas

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Which one of the following states of matter has the maximum intermolecular forces between them?

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Important Questions on Matter

EASY

Science>Physics>Matter>Characteristics of Molecules

According to the molecular model, when a solid is heated, the intermolecular space between its molecules decreases.

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Science>Physics>Matter>Characteristics of Molecules

Why is kinetic model of matter called kinetic?

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Science>Physics>Matter>Characteristics of Molecules

State three properties of molecules of a matter.

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Science>Physics>Matter>Characteristics of Molecules

According to the molecular model, when a solid is heated, the particles are given more pressure and start to vibrate faster.

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Science>Physics>Matter>Characteristics of Molecules

Some water evaporates from the surface of a hot cup of coffee. Explain how this cools the coffee.

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Science>Physics>Matter>Characteristics of Molecules

What are the three assumptions of the kinetic theory of matter?

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Science>Physics>Matter>Characteristics of Molecules

Explain the process of vaporization by molecular model.

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Science>Physics>Matter>Characteristics of Molecules

What do you mean by sublimation? Explain with an example.

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Science>Physics>Matter>Characteristics of Molecules

A student claims that the Kelvin temperature of a body is a measure of its internal energy. Explain why this statement is not correct by reference to a solid melting.

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Science>Physics>Matter>Characteristics of Molecules

What is evaporation? Explain it on the basis of molecular motion.

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Science>Physics>Matter>Characteristics of Molecules

Why is this model of matter sometimes described as the 'kinetic' model?

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Science>Physics>Matter>Characteristics of Molecules

Which states of matter are being described here? Complete the table.
The first example has been done for you.

Description	State or states
Occupies a fixed volume	Solid, liquid
Evaporates to become a gas
Takes the shape of its container
Has a fixed volume
May become a liquid when its temperature changes

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Science>Physics>Matter>Characteristics of Molecules

The smallest unit of matter that exists freely in nature is called a _____. (quark/molecule)

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Science>Physics>Matter>Characteristics of Molecules

According to the kinetic theory of matter, molecules are always in a state of rest.

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Science>Physics>Matter>Characteristics of Molecules

Match the following:

Column A	Column B
(a) Molecules	(i) Water boils
(b) $100 ° C$	(ii) Evaporation
(c) $0 ° C$	(iii) Changes from solid to gas
(d) At all temperatures	(iv) Matter
(e) Camphor	(v) Water freezes

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Science>Physics>Matter>Characteristics of Molecules

A small amount of smoke is blown into a small glass box. A bright light is shone into the box. When observed through a microscope, specks of light are seen to be moving around at random in the box. What evidence does this provide for the kinetic model of matter?

HARD

Science>Physics>Matter>Characteristics of Molecules

Describe an experiment to demonstrate the process of sublimation.

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Science>Physics>Matter>Characteristics of Molecules

Why does the size of naphthalene balls decrease when left open?

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Science>Physics>Matter>Characteristics of Molecules

_____ is a process that involves direct conversion of a solid into its vapour on heating. (Freezing/Sublimation)

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Science>Physics>Matter>Characteristics of Molecules

Complete the table. In the first row, draw sketches of the three states of matter in terms of the arrangement of the particles and their movement. Then describe the three states, referring to the three criteria in the first column.

State	Solid	Liquid	Gas

How close are particles to their neighbours?
How do the particles move?
Strength of forces between particles (strong/weak/zero)

Which one of the following states of matter has the maximum intermolecular forces between them?

Important Questions on Matter

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