Ontario Grade 9 Science Class Practice Exam

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Prepare for the Ontario Grade 9 Science Class Exam. Engage with interactive questions and detailed explanations to solidify your knowledge. Enhance your understanding of essential science concepts and boost your confidence for the test!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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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

The correct answer is: 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.