7th Grade - Unit 1: Matter & Solutions Review

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What is an element?

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An element is a pure substance that consists of only one kind of atom.

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What is a compound?

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A compound is a substance formed when two or more different types of atoms bond together.

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How can you identify a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties.

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What is the difference between a physical and a chemical change?

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A physical change does not change the substance's chemical identity, while a chemical change results in the formation of new substances.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded.

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What is a solution?

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A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent).