Page 19 - ACE YR IGCSE A TOP APPROACH TO CHEM

(c) Carbon dioxide is an acidic oxide. Describe a chemical test to show it is acidic.

test :
[1]

result :
[1]
(d) Carbon dioxide and copper(II) oxide are two different types of compounds.
Carbon dioxide has a low melting point, but copper(II) oxide has a high melting point.
Explain the differences in terms of attractive forces.

[3]
[Total: 10]

4 Diamond and graphite are both allotropes of carbon.
The diagrams show the structures of diamond and graphite.

diamond
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graphite
(a) They are both macromolecules.
Define macromolecule.

[1]

(b) The structures of diamond and graphite are different. Describe the differences between
them.

[2]

(c) Graphite is a good conductor of electricity but not diamond. Explain why.

[2]

(d) Aside from electrical conductivity, write one other property that can show the difference
between them.

[1]

Cambridge IGCSE TM
16 Ace Your Chemistry

Chapter 2.indd 16 3/4/22 11:59 AM