WORKSHEET- CHAPTER-1 MATTERS IN OUR SURROUNDING CLASS 9 ( NCERT )

 Matter in Our Surroundings


1.For question numbers 1 to 11, two statements are given-one labeled

 Assertion (A) and the other labeled Reason (R).

Select the correct answer to these questions from the codes (a), (b). (c) and (d) as given below :

(a) Both A and R are true and R is the correct explanation of the assertion.

(b) Both A and Rare true but R is not the correct explanation of the assertion.

(c) A is true but R is false.

 (d) A is false but R is true. (I Mark)

 1. Assertion (A) : Substances like sugar and salt are insoluble in water and on dissolving, they settle down at the bottom

Reason (R) : When we dissolve salt in water, the particles of salt get mixed into the spaces between the particles of water.

2. Assertion (A) : Sponge is a solid.

 Reason (R) : Sponge can change its shape under force and regains its shape when force is removed and it breaks on applying greater force.

3. Assertion (A) : Copper sulphate and potassium permanganate crystals are highly soluble in hot water Reason (R) : On increasing temperature, kinetic energy of the particles increases.

 4. Assertion (A) : The temperature at which a solid melts to form liquid at atmospheric pressure is called its melting point.

Reason (R) : AI the substances have same melting point.

5. Assertion (A) : The change of a solid directly into vapours on heating without undergoing intermediate liquid state is called sublimation.

Reason (R) : For substances like ammonium chloride showing sublimation, vapors of the solid are converted into solid ammonium chloride on coming in contact with the cold inner walls of the funnel

 6. Assertion (A) : We wear cotton clothes in summer to keep ourselves cool and comfortable.

Reason (R) : When a liquid evaporates, it takes latent heat of vaporization from the surroundings which on losing heat gets cooled.

7. Assertion (A) : During boiling, the temperature of water does not rise even though heat is being supplied continuously.

 Reason (R) : The heat of vaporization is used up to overcome the forces of attraction between water particles

 8. Assertion (A) : Ice floats on the surface of water.

Reason (R) : The density of both water and ice is same.

9. Assertion (A) : Camphor disappears without leaving any residue.

Reason (R) : Camphor undergoes sublimation.

10. Assertion (A) : There is no change in the temperature of a substance when it undergoes a change of state though it is still being heated.

Reason (R) : The heat supplied is absorbed either as latent heat of fusion or as latent heat of vaporization.

11. Assertion (A) I Diffusion rate of oxygen is less than nitrogen under identical conditions

 Reason (R): Molecular size of nitrogen is smaller than oxygen

II. Give one word for the following:

1. The two factors responsible for changing the physical state of matter.

2. The phenomenon of change of a liquid into vapours at any temperature below its boiling point 

3. The property of matter which allows it to resist the change in its shape.

4. The state of matter formed by cooling a gas of extremely low density to super low temperature.

 5. The state of matter existing of very high temperature and consisting of super energetic and super excited particles.

 6. Anything that occupies space and has mass and offers resistance to any applied force.

7. The temperature at which a solid melts to form a liquid at atmospheric pressure.

8. The amount of heat required to change 1 kg solid into its liquid state (at its melting point) at atmospheric pressure.

9. The amount of heat required to change 1 kg liquid to its gaseous state (at its boiling point) at atmospheric pressure.

 10. The direct change of a gas into solid without undergoing liquid state.

 III. Fill in the blanks: (1 Mark]

1.      Blood and water present in our body are______________.

2.      ________________ state of matter shows rigidity and incompressibility

3.       The minimum force of attraction exists between the particles of__________.

4.      ____________ are the substances having definite volume and no fixed shape.

5.       Expanded form of LPG is______________________.

6.       Expanded form of CNG is______________.

7.       When camphor or ammonium chloride is heated in a china dish covered by an inverted funnel, it undergoes______________.

8.       A desert cooler cools better on a_____________ and_____________ day.

9.       With increase in kinetic energy of particles, rate of evaporation _____________.

 IV. State whether the following statements are True or False : (1 Mark)

 1. Solid is the most rigid form of matter.

 2. Kinetic energy of the particles at melting or boiling point does not change.

3. Rate of evaporation increases on increasing the surface area.

4. The decreasing order of force of attraction between the particles is of following substances: 

Water> Sugar >Oxygen

 5. During boiling, the temperature of water does not rise even though heat is being supplied continuously.

 6. The force of attraction between the particles of a liquid decreases its volume.

 7. Movement of particles is maximum in solids, intermediate in liquids and minimum in gases.

 8. When we dissolve salt in water, the particles of salt get into the spaces between the particles.

9 .Steam causes severe burns in comparison to hot water due to its latent heat.

10. A desert cooler cools better on a rainy day than on dry day.

11. Solid carbon dioxide (dry ice) is changed Into carbon dioxide directly without changing liquid when pressure is reduced to one atmospheric pressure.

 12. When we put acetone on our palm, it gets vaporised by absorbing heat from our palm and it feels cool.

 13. A homogeneous mixture of two liquids can be separated using fractional distillation method.

14. Sand and sawdust can be separated by gravity method.

15. The melting and boiling points of a mixture fixed depending on the proportions of its components it is made of.

16. Separation of CCI4, from CS2 can be carried out by separating funnel method.

V. Match the terms given in column I with those given in column II. (1 Mark)

Column I

 

Column II

 

1.Rubber

(a)surface phenomena

2.Fluids

(b) Kelvin

3.Sublimation

(c) Pascal

4.Evaporation   

(d) solid

5.Pressure

(e) diffusion

6.Temperature

(f) naphthalene 

7.Volume

(g) liquids and gases        

8.Perfume

(h)m3

ANSWERS

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