Available Answers

1. 1.

   Tick (√) the correct option.

   1. Solids/Gases have a definite shape.
   2. Intermolecular force is maximum/minimum in solids.
   3. Liquids/Solids take up the shape of the container.
   4. Air matter is made up of cells/molecules.
   5. The force between the molecules is called intermolecular space/ intermolecular force.
2. 2.

   Fill in the blanks.

   1. On _______________ a liquid changes to ice.
   2. Oil is ________________ in water.
   3. A _________________ change is a reversible and a temporary change.
   4. Burning of paper is an example of a ______________ change.
   5. When a solute completely dissolves in a solvent, a ______________ is formed.
3. 3.

   Complete the flow chart given below.

   

4. 4.

   Choose the correct answer.

   1. The molecules of gases are _________________.
      1. loosely packed
      2. tightly packed
      3. very loosely packed
   2. The building blocks of matter are _______________.
      1. molecules 
      2. atoms
      3. units
   3. A change of state due to heating occurs by the process of ____________.
      1. melting
      2. vapourisation 
      3. both (i) and (ii)
   4. A substance in which other substances are dissolved is called a _______________.
      1. solute
      2. solvent
      3. solution
   5. Change of state due to cooling occurs due to ______________.
      1. freezing 
      2. condensation
      3. both (i) and (ii)
   6. A gas that does not dissolve in water is ______________.
      1. oxygen
      2. carbon dioxide
      3. nitrogen
5. 5.

   Give two examples for each of the following.

   1. Soluble gases
   2. Soluble liquids
   3. Insoluble solids
   4. Physical change
   5. Chemical change
6. 6.

   Define Matter.