Available Answers

1. 1.

   Identify the states of matter of the pictures given below.

   

2. 2.

   Fill in the blanks by choosing the correct answer from the options given below:

   1. Solids, liquids and gases are the three __________ of matter.
      1. states
      2. molecules
      3. atoms
   2. __________ is the smallest unit of matter.
      1. Force of attraction
      2. Molecule
      3. Atom
   3. When matter changes from one state to another, there is a change in the __________ of molecules.
      1. type
      2. arrangement
      3. structure
   4. Change in __________ leads to a change in state of matter.
      1. container
      2. temperature
      3. humidity
   5. The temperature at which a liquid changes into a gas on heating is called its __________ point.
      1. freezing
      2. boiling
      3. condensation
3. 3.

   Distinguish between melting and freezing with examples.
4. 4.

   Define the process of evaporation.
5. 5.

   Explain expansion and construction of substances.
6. 6.

   What are soluble and insoluble solids?