Acid, a substance with a pH that is lower than 7, Base, a substance with a pH that is higher than 7, Chemical Change, changes the identity of the substance to something new, Heat, how much energy an object holds, Neutral, a substance with a pH that is exactly 7, pH, scientists use this scale to measure acids and bases, Phase Change, when substances change forms using heat, Melting/Freezing, when a substance changes between a solid and a liquid, Boiling/Condensing, when a substance changes between a liquid and a gas, Physical Change, changes the appearance of the substance but not its identity, Solution, a mixture of a water and a powdery substance

Unit 4 Physical Changes

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