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=Question 5, 6

=Question 7, 8, 9

=Question 10, 11

 

Question 10. Classify the following into elements, compounds and mixtures.
Question 11. Which of the following are chemical changes?

Question 10. Classify the following into elements, compounds and mixtures.
(a) Sodium
(b) Soil
(c) Sugar solution
(d) Silver
(e) Calcium carbonate
(f) Tin
(g) Silicon
(h) Coal
(i) Air
(j) Soap
(k) Methane
(l) Carbon dioxide
(m) Blood
Answer:
Classification of the given substances in elements compounds and mixtures
Elements:     Sodium, Silver, Tin and Silicon.
Compounds: Calcium carbonate, Methane and carbon dioxide.
Mixtures:      Soil, Sugar, Coal, Air, Soap and Blood.

Question 11. Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron filings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle.
Answer:
Examples of chemical changes are
Growth of plant, Rusting of Iron, Cooking of food, Digestion of food, and burning of candle.



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Question 10. Classify the following into elements, compounds and mixtures.r/>Question 11

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