Bronze was one of the first alloys ever made and is still used today for bells, statues and medals. (a) Bronze is an alloy of copper. Name the two metals pr...
Question 1 Report
Bronze was one of the first alloys ever made and is still used today for bells, statues and medals.
(a) Bronze is an alloy of copper. Name the two metals present in bronze. [2]
(b) State one use of bronze. [1]
(c) Bronze is harder than pure copper. Explain why, in terms of the arrangement of the atoms. [2]
(d) Brass also contains copper. Name the second metal present in brass. [1]
(e) Give one property, other than hardness, that copper alloys such as brass and bronze have that makes them useful. [1]
(f) State whether an alloy is an element, a compound or a mixture. [1]
Answer Details
This question is about bronze, one of the oldest copper alloys, and tests the same layer-sliding model of hardness plus the basic classification of an alloy.
(a) Bronze is an alloy of copper [1] and tin [1].
(b) Any one correct use of bronze, for example bells, statues, medals or springs. [1]
(c) Bronze is harder than pure copper because the tin atoms are a different size from the copper atoms and distort the regular layers [1]; the distorted layers cannot slide over each other easily, so the alloy is harder [1].
(d) Brass is copper mixed with zinc. [1]
(e) Any one useful property of copper alloys other than hardness, for example resistance to corrosion, good appearance, or good electrical conductivity. [1]
(f) An alloy is a mixture. [1] The atoms are only mixed together, not chemically combined in a fixed ratio, so it is not a compound; and because it contains more than one type of atom it is not an element.
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