Ontario Grade 9 Science Class Practice Exam

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What determines a chemical property?

  1. The physical state of a substance

  2. The color and odor of a substance

  3. Changes in the substance's composition that produce one or more new substances

  4. The melting and boiling points of a substance

The correct answer is: Changes in the substance's composition that produce one or more new substances

Chemical properties are determined by changes in a substance's composition, which can produce one or more new substances. This is different from physical properties, such as the physical state, color, and odor of a substance, which do not involve any changes in composition. While melting and boiling points can provide information about a substance's physical properties, they do not necessarily determine its chemical properties.

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