Q29 of 252 Page 57

State three reasons why you think air is a mixture and water is a compound.

Air is a homogeneous mixture of a number of gases. It's two main constituents of gases are oxygen (21%) and Nitrogen (78%)

The constituent particles of homogenous mixture cannot be separated using centrifugation or decantation.


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27

What is the other name for impure substances? Give two examples of impure substances.

 29

Which of the following substances are elements?

Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

 30

Name two solid, two liquids and two gaseous elements at the room temperature.

 31

Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.