Unit 01 - Introduction to Chemistry - Academic Chemistry

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Chemistry

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The study of the structure and properties of matter, and changes it undergoes.

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Qualitative Observation

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Information describing color, odor, shape, or some other physical characteristic. Has no numbers.

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Quantitative Observation

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Numerical information describing how much, how little, how big, how tall, how fast, etc. Has numbers.

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Inference

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A statement, or conclusion, that has been reached based upon evidence from qualitative and quantitative observations.

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Physical Property

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A characteristic of matter that can be observed or measured without changing the sample's composition. (Ex: density, color, hardness, melting point, etc.)

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Chemical Property

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The ability or inability of a substance to combine with or change into one or more new substances. (Ex. rotting, cooking, souring, rusting, flammability, etc.)

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Physical Change

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A type of change that alters the physical properties of a substance but does not change its composition.

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Chemical Change

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A process involving one or more substances changing into new substances; also called a chemical reaction.

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Matter

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Anything that has mass and takes up space.

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Pure Substance

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A form of matter that has a uniform and unchanging composition.