Term 2 Chemistry

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Physical change

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A change of matter from one form to another without a change in chemical properties.

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Chemical change

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A change that occurs when one or more substances change into entirely new substances with different properties.

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Signs of a physical change

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Change in shape, expansion and contraction, change of state, mixing of substances.

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Signs of a chemical change

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Change in colour, odour (smell), formation of bubbles, precipitate (solid), temperature change, light produced.

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Expansion

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Occurs when substances are heated (volume increases and density decreases). Particles are spread further apart.

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Contraction

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Occurs when substances are cooled (volume decreases and density increases). Particles pack closer together.

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Three states of matter

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Solid, liquid, gas.

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Boiling point

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The temperature at which a liquid changes to a gas.

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Melting point

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The temperature at which a substance changes from a solid to a liquid.

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Freezing point

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The temperature at which a liquid becomes a solid.