Elements, Compounds & Mixtures Vocab Flashcards

Front

A mixture with a uniform composition throughout, where components are not visibly distinguishable.

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Homogeneous Mixture

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A mixture where components are unevenly distributed and easily identified, like salad or gravel.

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Heterogeneous Mixture

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A pure substance that cannot be broken down into simpler substances by chemical means; consists of one type of atom.

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Element

Front

A substance formed when two or more elements chemically combine in fixed proportions, resulting in a new material with different properties.

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Compound

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The smallest unit of an element that retains its properties; consists of protons, neutrons, and electrons.

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Atom

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An electron in the outermost shell of an atom, participating in chemical bonding.

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Valence Electron

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The number of protons in an atom's nucleus, determining the element's identity and position on the periodic table.

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Atomic Number

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The weighted average mass of an element's isotopes, measured in atomic mass units (amu), reflecting total protons and neutrons.

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Atomic Mass

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A process that transforms one substance into another, resulting in new chemical properties and compositions.

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Chemical Change

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A change affecting one or more physical properties of a substance without altering its chemical composition, like changes in state or shape.

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Physical Change