Question

1. Both the process of evaporation and boiling involves the change of state from liquid to gas but still they are different from each other. Justify.
2. Why is Kelvin considered as the best scale for measuring the temperature?
3. Camphor disappears without leaving any residue. Explain?
4. What happens when you pour some acetone on your palm?
5. How is heating of sugar and heating of ammonium chloride different from each other? Explain your answer.
6. List three characteristics of particles of matter. Describe one example for each characteristic to illustrate it. Name the characteristics which are responsible for
(i) spreading of smell of scent in a room and (ii) water taking shape of the vessel in which poured.
7. A gas jar containing air in inverted over another containing NO2 gas which is brown in color and heavier than air. After some time brown color is seen in the inverted gas jar too. Identify the phenomena associated with this observation.
8. A spoonful of sugar is added to a beaker containing 500ml of water and stirred for a while.State any two observations that you will make.Account for your observations.
9. (i) List four factors which affect evaporation.
(ii)Describe the activity to show that water is present in the air.
10. Distinguish between solids liquids and gases in tabular form under following headings:
(i)Rigidity (ii) Compressibility (iii) Inter particle force of attraction (iv) Inter particle spaces

Answer 1

1.Ans- Evaporation is a bulk phenomenon.

Evaporation is a process in which liquid change into gas.