Basic Chemistry Concepts

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Physical property

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A characteristic of a substance that can be observed or measured without changing its identity.

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Cohesion

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Water molecules sticking to other water molecules. (Example: water droplets forming on wax paper.)

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Adhesion

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• Water molecules sticking to other substances. (Example: water spreading out on glass.)

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Lustre

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The way a substance reflects light from its surface.

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Melting Point

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The temperature at which a solid becomes a liquid.

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Solubility

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The ability of a substance to dissolve in a liquid (like water).

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Malleability

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The ability of a substance to be hammered or rolled into sheets.

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Heterogenous Mixture

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A mixture where the different parts are visible and not evenly mixed.

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Homogenous Mixture

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A mixture that looks the same all the way through because the particles are evenly mixed (uniform).

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Element

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A pure substance made of only one kind of atom.