Answers

2015-09-29T16:46:41+05:30
Adding calcium to water  is chemical change because, it forms calcium hydroxide and hydrogen gas as the products. It also releases heat.
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2015-09-29T16:48:06+05:30
ADDING CALCIUM TO WATER IS A CHEMICAL CHANGE BECAUSE IT REACTS TO FORM NEW   SUBSTANCE CALLED CALCIUM HYDROXIDE .
IT DOES NOT SHOW ANY PROPERTIES OF CALCIUM AND WATER AND ARE VERY DIFFERENT FROM IT.
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