Everything Science Grade 10

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CHAPTER 2. CLASSIFICATION OF MATTER 2.8


Chapter 2 End of chapter exercises


1. Which of the following can be classified as a mixture:
a. sugar
b. table salt
c. air
d. iron
2. An element can be defined as:
a. A substance that cannot be separated into two or more substances by
ordinary chemical (or physical) means
b. A substance with constant composition
c. A substance that contains two or more substances, in definite propor-
tion by weight
d. A uniform substance
3. Classify each of the following substances as anelement, acompound, a
homogeneous mixture, or aheterogeneous mixture: salt, pure water, soil,
salt water, pure air, carbon dioxide, gold and bronze.

4. Look at the table below. In the first column (A) is a list of substances.
In the second column (B) is a description of the group that each of these
substances belongs in. Match up thesubstancein Column A with the
descriptionin Column B.

Column A Column B
1.iron A.a compound containing 2 elements
2.H 2 S B.a heterogeneous mixture
3.sugar solution C.a metal alloy
4.sand and stones D.an element
5.steel E.a homogeneous mixture

5. You are given a test tube that contains a mixture of iron filings and sulphur.
You are asked to weigh the amount of iron in the sample.
a. Suggest one method that you could use to separate the iron filings
from the sulphur.
b. What property of metals allows you to do this?

Chemistry: Matter and Materials 53

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