Question

SHORT/LONG ANSWER QUESTIONS:
Define physical changes with two examples.
2 Define chemical changes with two examples
3. What happens when a solid is heated?
How can matter be classified on the basis of their physical state?
5. Give reasons for the following:
a) Water is considered as matter.
b) Gases can be compressed easily.
c) Solids do not flow.
d) Melting of wax is a physical change.
6. In which state of matter will the molecules possess higher intermolecular force?
7. Define matter Under what conditions do solids liquids, and gases change their state?
8 Classify the following into solid;liquid and gas
coal,kerosene, wood, oxygen, sugar,blood, ale milk, wax
9. State two differences between physical and chemical changes.
10. State whether the following are physical and chemical changes :-
a) burning of sugar
b) heating of water
c) lightning
d) mixing of oil with water
e) boiling of an egg​

Answer 1

Answer:

a a change in which the physical state of the reactants is not changed . eg folding of the paper and boiling of water

b. a change in which the physical state of reactants is changed.eg burning of paper and digestion

8.solid:-coal ,wood ,sugar

liquid:-kerosene ,blood,wax,milk

gas:- oxygen

9. physical :- can be reversed

no change in colour

chemical:- cant be reversed

change in colour

10.b and d physical

a ,c,e are chemical

Explanation:

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