A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles.

Which one of the following represents a correct arrangement?

(a)Water, air, wind

(b) Air, sugar, oil

(c) Oxygen, water, sugar

(d) Salt, juice, air

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused.

Help her to identify the correct set of conditions.

(a)Low temperature, low pressure

(b) High temperature, low pressure

(c) Low temperature, high pressure

(d) High temperature, high pressure

On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be

(a)298 K, 311 K and 339 K

(b) 298 K, 300 K and 338 K

(c) 273 K, 278 K and 543 K

(d) 298 K, 310 K and 338 K

You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash.

What steps would you take to dry it faster?

Fill in the boxes given in the cooling curve

Study the flow chart

A B C

(1) Solid Gas Liquid

(2) Gas Liquid Solid

(3) Liquid Solid Gas

(4) Solid Liquid Gas

Which one of the following correctly

represents A, B and C respectively?

A. (1)

B. (2)

C. (3)

D. (4)

This experiment shows that _____.

A: steam is formed when water boils.B: water vapour loses heat during condensation.C: water changes into water vapour only when boiling occurs.

A)A and B only B). A and C only C). B and C only D). A, B and C

This diagram shows an experiment to demonstrate diffusion of gases

What do you know from the above experiment regarding diffusion of gases ?

Four identical containers A,B,C and D were filled with the same amount of water. They were left in places with four different conditions for half a day as shown in the table below

  Container Condition

A Sunny and windy

B Sunny and not windy

C In the shade and

windy

D In the shade and not

windy

Arrange the containers A,B,C and D in order starting with the most amount of water left after half a day and explain why?

In the above graph at which parts the energy of particles will increase ?

The table shows the melting points and boiling points of four substances.

Which substance is a liquid at a room temperature of 200 C?

Which diagram represents the change in arrangement of the particles

Water spilled on the ground on a hot day evaporates

volume? ?

A block of ice is heated until it has all melted. The water that is produced is then heated until it boils.

Which line in the table states what happens to the temperature of the ice while it is melting,and to the temperature of the water while it is boiling?

What do you learn from these pictures?

In which case condensation will be more ? Why ?

AB

A certain substance is in the solid state at a temperature of –36 °C. It is heated at a constant rate for 32 minutes. The record of its temperature is given in the table below.

State the duration of time from -------min to -------min at which the energy is being supplied as latent heat .

What can you infer from the above diagram about liquids?

A block of ice is heated at a constant rate. Eventually the melted ice boils.

The graph shows how the temperature changes with time.

How many minutes did it take to melt all the ice?

?

??

?

1. On Kelvin scale 0oC is equal to – a. 273 K b. -273 K c. 0 K d. 100 K

2. SI unit of temperature is –

a. Kelvin b. Celsius c. Fahrenheit d. Pascal

3. Dry ice means –

a. solid SO2 b. solid water c. solid CO2 d. solid CO

1. During evaporation, the particles of liquid evaporate from –

a. The bulk of liquid b. surface only c. the surface and bulk of liquid d. none of them.

2. Which of the following will not sublime –

a. Camphor b. ammonium chloride c. bromine d. iodine

3. The amount of heat energy required to change 1 kg of liquid into solid at its freezing point is called –

a. Melting point b. latent heat of fusion c. boiling point d. latent heat of vaporization.

1.The states of matter can be changed by changing –

a.Temperature b. pressure c. both (a) and (b) d. none of these

2 . The rate of evaporation does not depend on –

a. Temperature b. humidity c. pressure d. speed of wind.

3 . Which of the following is accompanied by cooling –

a. Vaporization b. evaporation c. condensation d. none of these.

1. Which of the following cannot be considered as matter –

a. Mixture b. affection c. gas d. liquid.

2. LPG is used in the kitchens in our homes in the-

a. Solid form b. compressed form c. gaseous form

d. none.

3. Which of the following statements is not correct –

a. The density of ice is less than the density of water.

b. To convert a temperature on the Kelvin scale to Celsius scale, subtract 273 from the given temperature. c. To convert a temperature on the Celsius scale to Kelvinscale, add

273 to the given temperature.

d. Vaporisation of a liquid causes cooling.

1. The states of matter can be changed by changing –

a.Temperature b. pressure c. both (a) and (b) d. none of these

2 . The rate of evaporation does not depend on –

a.Temperature b. humidity c. pressure d. speed of wind.

3 . Which of the following is accompanied by cooling –

a. Vaporization b. evaporation c. condensation d. none of these.

What might be the reason for faster diffusion of red colour ?

A B

The direction of diffusion will be from -------to --------

1 2

Name these two phenomena

What processes can you observe in the above activity …..

What is the difference between these two though they are at the same temperature ?

Why does an iceberg float on water ?