Ontario Grade 9 Science Class Practice Exam

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What is a chemical change?

  1. A change in the physical form or properties of a substance

  2. A change that produces one or more new substances

  3. A change in the state of matter

  4. A reversible change in the appearance of a substance

The correct answer is: A change that produces one or more new substances

A is incorrect because it refers to a physical change, which involves altering the form or properties of a substance without changing its chemical composition. C is incorrect because it refers to a change in the state of matter, such as from a solid to a liquid. While this is a type of change, it does not necessarily involve the formation of new substances. D is incorrect because it refers to a reversible change in appearance, which may involve a physical change, but does not necessarily involve the formation of new substances. A chemical change, or a chemical reaction, involves the breaking and forming of chemical bonds between atoms, resulting in the production of new substances with different chemical compositions than the original substances. Thus, the correct answer is B.

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