Ontario Grade 9 Science Class Practice Exam

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What is a compound?

A mixture of two or more elements
An element found in its natural state
A pure substance of two or more different elements that are chemically joined
A chemical reaction product

The correct answer is: A pure substance of two or more different elements that are chemically joined

A compound is a pure substance that is formed by chemically joining two or more elements together in fixed ratios. Option A is incorrect because a mixture does not have fixed ratios and the components can be easily separated. Option B is incorrect because it states an element, which by definition cannot be a compound as it cannot be broken down into simpler substances. Option D is incorrect because a compound is not a product of a chemical reaction, but rather is formed through chemical bonding between elements.