Metals, Plastics, Fertilisers, Nuclear Chemistry Worksheet - National 5 Unit 3 Page 3
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13Exercise 2 – Metals
1. a) Which of the following substances will conduct electricity?
Gold foil, hydrogen gas, sulphur powder, magnesium ribbon, bromine liquid
Phosphorous sticks, liquid oxygen, copper foil.
b) What do the substances that conduct have in common?
c) Using your knowledge of chemistry, explain what is meant by a metallic bond and
how a metal is able to conduct electricity. You may wish to use a diagram.
2. Copy and complete the following word equations for the reaction of metals.
a) Zinc + hydrochloric acid
b) Potassium + water
c) Iron(III) + oxygen
3. Using your answers for Q1, write out the ionic equations for each of the reactions.
4. Pure gold is known as 24-carat gold. In jewellery, is often mixed with other metals to
make it harder. One common mixture is 9-carat gold. It’s composition by mass is shown
in the pie chart.
a) What name is given to a mixture of metals such as 9-carat gold?
b) A 9-carat gold ring weighs 7.88g. Calculate the mass of gold in the ring.
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