Humber Admissions Practice Test

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Which of the following best describes a pure substance?

A substance that contains two or more elements
A substance made of only one kind of matter/substance
A substance that can vary in composition
A substance that consists of two or more phases

The correct answer is: A substance made of only one kind of matter/substance

A pure substance is defined as a material that has a consistent and uniform composition throughout. This means that it contains only one type of particle or matter. Therefore, the characterization of a pure substance as being made of only one kind of matter is accurate and aligns with the definition. In contrast, options describing the substance as containing two or more elements, varying in composition, or consisting of two or more phases would not fit the definition of a pure substance. The presence of different elements or phases implies a mixture rather than purity. Thus, recognizing that a pure substance maintains a singular composition is crucial for distinguishing it from mixtures, which can have varying compositions and characteristics.