(a) Define an element.
(b) Why is water not considered an element?
(c) Why is an alloy considered a mixture?
(a) An element is the basic form of matter that cannot be broken down into simpler substances by usual chemical methods of applying heat, light or electric energy.
(b) Water is not considered an element because it can be split up into its two simpler substances, hydrogen and oxygen, by electricity.
(c) An alloy is considered a mixture because:
(i) It shows the properties of its constituents.
(ii) It has a variable composition.
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