Chemistry: Classification of Matter

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the composition is uniform throughout. Examples include solutions like saltwater and coffee.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the composition is not uniform throughout. Examples include salad and rocky soil.

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What is matter?

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Matter is anything that has mass and occupies space. It includes solids, liquids, gases, and plasma.

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What is NOT considered matter?

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Gravity is not considered matter because it does not have mass or occupy space.

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What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its identity. Example: Silver is shiny.

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What is a chemical property?

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A chemical property is a characteristic that can only be observed during a chemical reaction. Example: Alcohols are flammable.

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What is a monatomic element?

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A monatomic element consists of single atoms not bonded to each other. Example: Noble gases like helium and neon.

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What is a diatomic element?

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A diatomic element consists of two atoms bonded together. Example: Oxygen (O2) and nitrogen (N2).

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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. Example: Stretching a rubber band.

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What is a chemical change?

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A chemical change results in the formation of new chemical substances. Signs include color change, gas production, and heat release.