Question

16. (a) Classify the following as pure substances or mixtures
(b) Separate the pure substance into elements and
compounds and divide the mixtures into homogeneous
and heterogenous categories:
(i) graphite (ii) milk (iii) air (iv) diamond (v) petrol (vi)
tap water (vii) distilled water (viii) oxygen (ix) 22 carat
gold (x) steel (xi) iron (xii) iodized table salt (xiii) wood
(xiv) cloud.
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Answer 1

Answer:

1. graphite = element

2. milk = heterogeneous mixture (colloid) 3.air = homogeneous mixture

4.diamond =element

5. petrol= homogeneous mixture

6. tap water=compound

7. distilled water =compound

8. oxygen =element

9. 22 carat gold = homogeneous mixture 10.steel= homogeneous mixture

11.iron = element

12. iodized table salt = compound

13. wood= element

14.cloud= heterogeneous mixture.