State three differences between a metal and a non-metal.
(i)
Explain why gold is preferred to iron in the making of jewelleries.
(ii)
State one way of preventing rusting.
Consider the substances listed below: carbon dioxide, gold, bronze, iron, oxygen and ink. From the list, select the substance that:
(i)
supports burning;
(ii)
is used as jewellery;
(iii)
is used for making statues.
Classify the first four elements of the periodic table as metals and non- metals.
i)
What is rusting?
ii)
State two effects of rusting.
(i)
What is an alloy?
(ii)
Mention the components of each of the following alloys:
(α)
steel;
(β)
brass.
Give one reason why copper, silver and gold are mostly used in making ornaments and jewellery.
Explain corrosion
Explain briefly why
(i)
gold is used to make necklaces and earrings.
(ii)
steel is used instead of iron to make car bodies
What are the compositions of each of the following alloys?
Bronze, Brass, Steel and Duralumin
Give two examples of alloys and state their constituents
(i)
Name the gas which is used in both rusting and burning
(ii)
State two ways in which rusting can be prevented in everyday life.
State three differences between metals and non-metals in terms of their physical properties.
(i)
What is an alloy?
(ii)
Name the constituent elements in brass.
(i)
Consider the following elements and state which element(s) is/are metals:
11Na,7N,6C, 3Li
(ii)
Explain briefly what is observed when pieces of each of the following metals are dropped into two separate test tubes each containing dilute hydrochloric acid:
(α)
magnesium;
(β)
silver.
(i)
Explain why steel is preferred to iron in building construction.
(ii)
State two ways of preventing rusting.
State the composition of each of the following alloys:
i)
Brass
ii)
Steel
iii)
Bronze
i)
What is an alloy?
ii)
State two causes of corrosion of metals.
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