Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

Question: 1 / 400

What is a mixture?

Two or more molecules chemically joined together

A single type of atom

An object with more electrons than protons

A substance made up of at least two different types of particles

A mixture is a physical combination of at least two different types of particles. Option A is incorrect because it describes a chemical compound rather than a mixture. In a compound, two or more molecules are chemically bonded together, while in a mixture, the particles retain their individual properties. Option B is incorrect because it describes an element, which is a substance made up of only one type of atom. Option C is incorrect because it describes an object's net charge rather than its composition. A mixture can be made up of particles with varying numbers of electrons and protons. Option D is the best choice because it accurately defines a mixture as a combination of different particles without assuming their properties.

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