Question

a pure substance can be an element or a compound

Answer 1

One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.

An enclosure within which workers, prisoners, or soldiers are confined

2. A group of buildings situated close together, e.g. for a school or block of offices

3. Anything made by combining several things.

Answer 2

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IN CHEMISTRY,

a pure substance means either an element or a compound.

Thus, H, O, Na, Fe, Cu etc. are pure substances; and so are compounds such as water, sugar, ammonia, sodium chloride, methane, ethanol etc.

A compound is composed of two or more elements combined in a fixed ratio by mass.

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