What is a substance made of only one kind of matter and having definite properties?

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Multiple Choice

What is a substance made of only one kind of matter and having definite properties?

Explanation:
A pure substance is described here. It has a uniform, single kind of matter and definite properties that don’t change from sample to sample. That means the composition is fixed, so melting points, boiling points, and other characteristics are consistent. Pure substances can be elements (like oxygen or gold) or compounds (like water or carbon dioxide). In contrast, a mixture contains more than one kind of matter and its composition and properties can vary, which is why this statement points to a pure substance.

A pure substance is described here. It has a uniform, single kind of matter and definite properties that don’t change from sample to sample. That means the composition is fixed, so melting points, boiling points, and other characteristics are consistent. Pure substances can be elements (like oxygen or gold) or compounds (like water or carbon dioxide). In contrast, a mixture contains more than one kind of matter and its composition and properties can vary, which is why this statement points to a pure substance.

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