Topic 1 - Physical Changes

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Last updated 11:28 AM on 5/23/26
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11 Terms

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Melting

when a substance changes from a solid to a liquid

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Freezing

When a substance changes from a liquid to a solid

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Evaporation

when a liquid slowly turns into a gas below its boiling point

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Boiling

When a substance changes from a liquid to a gas

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Condensation

when a substance changes from a gas to a liquid

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Sublimation

when a substance changes from a solid to a gas

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Deposition

when a substance changes from gas to a solid

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Diffusion

net movement of particles from an area of high concentration to an area of low concentration (only in liquids/gases)

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Brownian Motion

random motion of particles in a fluid due to collisions with molecules

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Concentration

a measure of the amount of substance (solute) dissolved in a specific volume of solvent, where the units are typically mol/dm3

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Dilution

the addition of water to a solution to reduce the amount of solute particles present in a given volume