Which is the best definition of a pure substance?

Question

Quizplus · Accepted Answer

A pure substance is a material that is made up of only one type of atom or molecule. Its properties are consistent throughout the substance, and these properties cannot be changed by further physical separation. Examples include elements (such as gold or oxygen) and compounds (such as water or carbon dioxide).

Option A is incorrect as it describes a mixture. Option B is incorrect as it only describes one phase of matter. Option D is incorrect as measuring the properties of a material does not necessarily make it a pure substance. Option E is incorrect as heating does not determine whether a substance is pure or not.

Which Is the Best Definition of a Pure Substance