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| can be observed without changing the identity of the substance |
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| an important physical property of matter |
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| solid, liquid, gas, plasma |
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| definite shape and volume, contains particles that are tightly packed |
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| have particles that are close together but free to move around, no definite shape, definite volume |
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| no definite shape or volume, can be compressed into a very small area or can keep expanding forever |
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| very high in energy, ex. the sun |
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| solid that loses its shape under certain conditions, wax playdough clay icecream |
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| when the pressure doubles the volume of the gas is cut in half |
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| as the temperature increases so does the volume of the gas |
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| vaporization (boiling point) or evaporation |
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| solid -> gas, iodine and dry ice |
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| physical changes that absorb heat |
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| melting, vaporization, sublimation |
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| physical changes that give off heat |
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| freezing and condensation |
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| It takes _ to cause a phase change |
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| A _ change produces a new and different substance |
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