Change of State

Q. WHAT IS THE DIFFERENCE BETWEEN SOLID , LIQUID AND GAS

Q. What is the physical state of water at ${250}^{o}C?$

1. solid
2. gaseous
3. none of the above
4. liquid

Q.

Melting point of ice_______________?

Q.

Match the column

Column 1	Column 2
melting	solid to gas
boiling	gas to liquid
freezing	solid to liquid
sublimation	liquid to gas
condensation	liquid to solid

Q.

Why is evaporation a surface phenomenon?

Q.

The temperature at which a gas starts changing into the liquid state is called as ___

1. Freezing point

2. Condensation point

3. Fusion point

4. Boiling point

Q.

The word "Fusion" is meant for___.

1. melting

2. freezing

3. heating

4. boiling

Q.

What do you mean by the changes of state? Write the flow chart showing the complete cycle of change of state.

Q.

What is the melting point of the solid?

Q.

Explain freezing on the basis of kinetic theory.

Q. The process in which substance changes from gaseous state to solid state is called .

1. evaporation
2. condensation
3. fusion
4. deposition

Q.

The process of conversion of liquid into gas is called sublimation.

1. True
2. False

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Define sublime and sublimate?

Q.

What are flammable and Non-flammable substances?

Q.

Molecules of each substance are identical.

1. True
2. False

Q.

When solid reach their melting point they become what?

Q.

Which of the following statement is incorrect?

1. The particles of matter are very, very small

2. The particles of matter attract one another

3. The particles of some of the matter are moving constantly

4. The particles of all the matter have spaces between them

Q.

Fill in the blank by choosing the correct word from the given options.

_______ state of matter consists of electrically charged particles of gaseous matter.

1. Incompressible

2. Plasma

3. Spaces

4. Any number

5. Volume

Q. Why is there no change in temperature when water starts boiling?

Q.

A pure substance consists of a single type of particle.

1. True
2. False

Q.

Write true or false for each statement :

(a) The temperature of a substance remains unaffected during its change of state.

(b) Ice melts at ${100}^{\circ }C.$

(c) Water at ${100}^{\circ }C.$ has more heat than steam at ${100}^{\circ }C.$

(d) Evaporation of a liquid causes cooling.

(e) Water evaporates only at ${100}^{\circ }C.$

(f) Boiling takes place over the entire mass of the liquid.

(g) Evaporation takes place over the entire mass of the liqid.

(h) The process of a gas converting directly into solid is called vaporization.

(i) At high altitudes, water boils above ${100}^{\circ }C.$

(j) The melting point of ice is $0^{\circ }C$

Q.

How do the vaporisation point water and condensation point of steam compare numerically?

Q.

4. _______________ state of matter consists of electrically charged particles of gaseous matter.

Q.

The process by which a drop of ink spreads in a beaker of water.

Q.

The condensation point of steam is

1. ${100}^{0}C$

2. $0^{0}C$

3. ${50}^{0}C$

4. ${90}^{0}C$

Q.

What is the space between the molecules of a substance called?

Q.

Describe an activity to demonstrate that the particles of matter are constantly moving.

Q. Pressurising a gas and reducing its temperature helps in the of gases.

1. liquefaction
2. expansion
3. evaporation

Q. What are volatile compounds?

1. Easily vapourising compounds
2. Inflammable compounds
3. Highly reactive compounds
4. Compounds having low melting points

Q. What is liquefaction point?

1. the constant temperature at which a gas becomes liquid under normal pressure.
2. the constant temperature at which a liquid changes into a solid by giving out heat energy.
3. the constant temperature at which a solid becomes gas under normal pressure.
4. the constant temperature at which a liquid changes into a gas by giving out heat energy.