Ontario Grade 9 Science Class Practice Exam

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What is a pure substance?

  1. A mixture of multiple types of particles

  2. A substance made up of only one type of particle

  3. A liquid that is clear and colorless

  4. A substance that can be easily separated into its components

The correct answer is: A substance made up of only one type of particle

A pure substance is a substance that is made up of only one type of particle. This excludes options A, C, and D which mention multiple types of particles, liquids, and components, respectively. A pure substance is always uniform in its physical and chemical properties, unlike a mixture which can have varying compositions depending on its components. Thus, B is the only answer that accurately defines a pure substance.

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