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Worksheet 14

The document is a worksheet focused on the properties and extraction of metals and their alloys. It includes questions about metal alloys, the extraction of iron and aluminum, and the properties of metals and their uses. The worksheet is designed for educational purposes, allowing students to demonstrate their understanding of the material.

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chikovanimariamm
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37 views2 pages

Worksheet 14

The document is a worksheet focused on the properties and extraction of metals and their alloys. It includes questions about metal alloys, the extraction of iron and aluminum, and the properties of metals and their uses. The worksheet is designed for educational purposes, allowing students to demonstrate their understanding of the material.

Uploaded by

chikovanimariamm
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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WORKSHEET Name:

14 Making use of metals


Core curriculum
1 Which statement is not correct about metal alloys? Tick its box.
A They are attracted to a magnet.

B They are mixtures.

C They conduct electricity.

D They have different properties from pure metals.

2 Which of these will you choose, if you want a strong light metal that resists corrosion? Tick its box.

A aluminium B lead C iron D sodium

3 Complete this paragraph about the extraction of iron.

Iron is extracted from an ore called , in a furnace.

The other materials are coke and Coke is almost pure

, and burns in oxygen to form This reacts with

more coke to form , which acts as the agent.

The two waste gases from the extraction are and

4 For many uses, pure metals are turned into alloys.


This diagram shows the structure of an alloy.

a What is an alloy?

b Give two examples of metal properties that can be improved by making alloys.

c i There are many different steels. Name the main metal in them:

ii Other metals are added to this metal, to make the alloy stainless steel. Name two of them:

d Brass is an alloy of the metals and Unlike those two

metals, it has this new property:

© OUP: this may be reproduced for class use solely for the purchaser’s institute
WORKSHEET

Extended curriculum
5 a Complete these sentences about the extraction of aluminium by electrolysis.

The main ore of aluminium is called . The compound obtained from it, for

electrolysis, is called and its formula is

b This diagram shows a cross-section of the electrolysis cell used in extracting aluminium:

oxygen bubbling off

steel cell ore dissolved in molten


cryolite at about 950 8c
molten aluminium

molten aluminium out

c i Label the anode and cathode, on the diagram.

ii What are the electrodes made of?

d One electrode must be replaced at intervals, because it is destroyed in a chemical reaction.

i Which electrode is it?

ii What reaction takes place?

e Why is cryolite needed?

f During the extraction, aluminium ions are reduced. Give the half-equation for this reaction:

6 a Aluminium has many uses. Give reasons why it is used:

i to make food containers

ii in electricity cables

b In air, the surface of aluminium is quickly coated with a thin layer of aluminium oxide.
Comment about the effect of this on the apparent reactivity, and uses, of aluminium.

© OUP: this may be reproduced for class use solely for the purchaser’s institute

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