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A colloid is a mixture or substance, in which the little particles stay in place. The particles are usually easily seen in the substance.

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A suspension is a mixture, in which the undissolved particles fall to the bottom.

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Crushing is when you smash or pound a substance until it breaks apart into smaller pieces. This process can also speed up the dissolving of a substance.

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Heating is when you bring up the temperature of a substance. If you're dissolving a substance, then this process can also speed it up.

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Mixing is when one or more substances get stirred or combined together. This process speeds up the dissolving of a substance

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Solubility is the ability of a substance to dissolve in another substance. A solute will always have solubility.

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Concentration is the amount of solute, dissolved in the solvent. The higher the concentration, the higher the amount of solute.