Available Answers

1. 1.

   Choose the correct answer.

   1. The smallest particle which makes up matter is a/an
      1. atom 
      2. molecule
      3. element
      4. particle
   2. The process by which a solid changes into a liquid is called
      1. freezing
      2. melting
      3. condensation
      4. liquefaction
   3. There are large intermolecular spaces in
      1. solid
      2. liquid
      3. gases
      4. all of these
   4. Intermolecular forces of attraction is is maximum in
      1. solids
      2. liquids
      3. gases
      4. all of these
   5. An example of a sublimable substance is
      1. water
      2. plastic
      3. iodine
      4. glass
   6. The SI unit of mass is
      1. gram
      2. kilogram
      3. newton
      4. all of these
   7. The state of matter that cannot be compressed easily is
      1. solid
      2. liquid
      3. gas
      4. liquid and gas
   8. The spontaneous mixing of the particles of two or more substances is called
      1. compressibility
      2. diffusion
      3. attraction
      4. repulsion
   9. the increase in size of a substance on heating is called
      1. contradiction
      2. attraction
      3. expansion
      4. diffusion
   10. A chemical change is the change in
       1. state of matter
       2. size of matter
       3. contraction
       4. composition
2. 2.

   Fill in the blanks.

   1. The state of matter with definite shape and definite volume is called the ________________ state.
   2. The state of matter that has maximum compressibility is the ________________ state.
   3. Liquids and ________________ can flow.
   4. Boiling points of water is ________________.
   5. Intermolecular force of attraction is least in the ________________ state.
   6. Air has ________________ and occupies ________________.
   7. The volume of any substance ________________ when cooled.
   8. Sugar changes its ________________ to become caramel which is a substance.
3. 3.

   Write True (T) or False (F) against the following statements:

   1. Gas molecules can move freely in all directions.
   2. Molecules are very closely packed in liquids.
   3. The process of conversation of a solid into a liquid is called boiling.
   4. All matter is made up of tiny, invisible moving particles called atoms.
   5. A liquid has definite volume.
4. 4.

   Match the following:

   Column A	Column B
   1. Atom	a. Chemical change
   2. Solid	b. gaps between the molecules
   3. Vapourisation	c. Change of state from liquid to gas
   4. Gas	d. Tiny particles of matter
   5. Intermolecular space	e. Have definite shape and volume
   6. New substance	f. Have least intermolecular force of attraction

    

5. 5.

   What do you understand by matter? Name the three states of matter.

6. 6.

   Differentiate between solids, liquids and gases in terms of intermolecular space between the molecules.