Worksheet: Unit-5 Alloys
Name___________________________
ID___________________
Subject- Science
Class_________7________
Define the term ‘alloy’.
Table 1 shows the melting points of some pure metals and some alloys.
Table 1
Melting Point (°C)
Copper
Brass
Bronze
Iron
Steel
1090
900
950
1540
1370
1. Name two pure metals in Table 1.
1.
2.
3. Complete the bar chart using data from Table 1.
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Alloys
4. Draw diagrams in the boxes below to show how the structure of a pure metal is different
to that of an alloy.
pure metal
alloy
The main element in brass and bronze is copper. The main element in steel is iron.
5. a) Describe how the melting point of a pure metal compares to the melting point of an
alloy that contains that metal.
b) Describe one other difference between the properties of pure metals and alloys.
The proportion of gold in an alloy is measured in carats:
• pure gold is 24 carats
• 75% gold is 18 carats
6. A jeweller has been asked to design a new piece of jewellery for a client.
Suggest, with reasons, whether the jewellery piece should be made of 24-carat gold or
18-carat gold.
Taken From: Twinkl.co.th
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