A pure substance is a material made of only one type of particle.
What is pure substance?
A substance that has fixed in chemical composition throughout is called a pure substance such as water, air and nitrogen. The pure substance doesn't have to be of a single element or compound. A pure substance consists only of one element for the or one compound. a mixture consists of two or more different substances, not chemically joined together.
Examples of pure substance include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and the baking soda (sodium bicarbonate). Crystals, in general, are pure substances.
Elements are the pure substances that cannot be broken down into simpler substances by any physical or chemical means we know as they have only one kind of atom at the entire composition. Thus when gold is tjr broken down it still remains gold and hence is considered a pure substance is and an element.
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