Question

(a) What is an alloy? How is an alloy made?
(b) Name an alloy
(i) which has a lower melting point than its constituents
(ii) which is more hard, tough and strong than its constituents
(c) Name the constituents of the alloy ‘Magnalium’. Write its two uses.

Answer 1

Answer:

a) Alloy is a uniform mixture.it is made up of two or more chemical elements of which atleast one is metal

b)brass ,bronze ,steel ,coin metal

Answer 2

Alloys

Explanation:

(a) Alloy is a uniform mixture of two or more chemical elements, of which at least one is a metal.

Most alloys are made by melting the metals, mixing them while they are liquid to form a solution, then leaving them to cool and turn solid again.

(b)

1. A solder has a lower melting point than its constituents.
2. The alloy Brass is more hard, tough and strong than its constituents.

(c) Magnalium is an alloy made of 5% magnesium and 95% aluminum. This increases the strength and hardness of aluminium.  

Magnalium is used to make scientific instruments and metal mirrors.