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In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. When the water is exposed to air, some of the calcium bicarbonate turns into calcium carbonate, which gets deposited on the ground. What makes this process a chemical change?

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The answer is A, a new chemical substance has to be formed for there to be a chemical change. This is because chemical change happens when a phase of matter changes due to chemicals.