Properties of Matter, Pure Substances and Mixtures

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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: Ice melting into water.

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What is a chemical property?

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A chemical property is a characteristic of a substance that describes its ability to undergo a specific chemical change. Example: The ability of a substance to catch fire.

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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 combined. Example: Air, which contains various gases.

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What is a compound?

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A compound is a substance that is made up of two or more different types of elements that are chemically bonded together. Example: Water (H2O), which consists of hydrogen and oxygen.

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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. Example: Distilled water.

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What is the difference between a mixture and a compound?

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A mixture consists of two or more substances that are not chemically combined, while a compound is formed when two or more elements are chemically bonded.

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What is an example of a physical property?

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An example of a physical property is color, boiling point, or density.

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron.

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What is the state of matter?

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The state of matter refers to the distinct forms that different phases of matter take on. The four main states are solid, liquid, gas, and plasma.

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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. Example: Oxygen (O).