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2015-09-29T16:59:50+05:30

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Adding calcium to water  is chemical change because, it forms calcium hydroxide and hydrogen gas as the products.Here, Calcium is an element, and water is a compound, which results in a new compound.
Therefore, the chemical nature of the reactants changes. Therefore, it is a chemical change.

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2015-09-29T17:04:24+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Adding calcium to water is a chemical change, because it forms calcium hydroxide and hydrogen gas as the products. Since new products are formed, which have completely different properties from their reactants and heat is also released in the process, we can call it a chemical change.
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