Ontario Grade 9 Science Class Practice Exam

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Which best describes a physical property?

  1. A property that changes the chemical composition of a substance

  2. A property that cannot be determined without altering the substance

  3. A characteristic that can be observed without changing the substance's composition

  4. A trait that makes a substance reactive with other chemicals

The correct answer is: A characteristic that can be observed without changing the substance's composition

A A property that changes the chemical composition of a substance - This option describes a chemical property, which involves changes in the composition of a substance. This is different from a physical property, which does not involve a change in composition. B: A property that cannot be determined without altering the substance - This option is incorrect because physical properties can be observed without altering the substance. This is what distinguishes them from chemical properties. D: A trait that makes a substance reactive with other chemicals - This option describes a chemical property, specifically a substance's reactivity with other chemicals. This is not a physical property, which focuses on observable characteristics of a substance.

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