Question

what happens when. a)A piece of calcium is dropped in water

Answer 1

1) when a piece of calcium is dropped in water it forms calcium hydroxide

2)  iron will displace copper from its sulphate solution as it is more reactive than copper  will change from blue to reddish brown

3) .carbon dioxide will get  transformed into dry ice

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Answer 2

1.calcium will react with water vigorously.and form calcium hydroxide
2it color of copper will change from blue to reddish brown
3.carbon dioxide will be transformed into dry ice