8th Grade Sci. End of Matter Unit Review

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What is a compound?

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A compound is a substance formed when two or more elements chemically bond together in a fixed ratio.

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What is a mixture?

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A mixture is a combination of two or more substances where each retains its own properties. Mixtures can be homogeneous or heterogeneous.

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What is a physical property of matter?

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A physical property is a characteristic of a substance that can be observed or measured without changing its identity, such as volume, mass, and density.

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What is the Law of Conservation of Matter?

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The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction; the mass of the reactants must equal the mass of the products.

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What is a chemical reaction?

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A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance, resulting in the formation of new substances.

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What is 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, such as melting or boiling.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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What is a solution?

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A solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent).

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What is volume?

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Volume is the amount of space that a substance or object occupies, typically measured in liters or cubic centimeters.