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04-12
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Title: Evidence of Chemical Change
Caption: The evidence for a chemical change includes (a) gas bubbles from the reaction of calcium metal in water, (b) heat and light energy from the reaction of potassium metal in water, and (c) a colorful, insoluble substance from the reaction of two solutions.
Notes: We can be sure that there is a chemical change occurring in each of these instances because new substances are being formed with different chemical properties.
Keywords: calcium,water,potassium,solution,chemical-change,chemical-property