Everything Science Grade 10

2.3 CHAPTER 2. CLASSIFICATION OF MATTER

• Steam


• Ammonia gas (NH 3 )

1. Use coloured balls to build models
   for each of the substances given.


2. Classify the substances according
   to elements, compounds, homo-
   geneous mixtures, heterogeneous
   mixture, pure substance, impure
   substance.


3. Draw submicroscopic representa-
   tions for each of the above exam-
   ples.

Exercise 2 - 2

1. In the following table, tick whether each of the substances listed is amix-

tureor apure substance. If it is a mixture, also say whether it is a homo-

geneous or heterogeneous mixture.

Substance Mixture or pure Homogeneous or heterogeneous mixture

fizzy colddrink

steel

oxygen

iron filings

smoke

limestone (CaCO 3 )

2. In each of the following cases, say whether the substance is an element, a

mixture or a compound.

a. Cu

b. iron and sulphur

c. Al

d. H 2 SO 4

e. SO 3

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34 Chemistry: Matter and Materials