Question

a) what happens when metals react with water.
b) calcium dipped in cold water start floating.Give reason.
c) why do ionic compounds have melting point.
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Answer 1

Answer:

a) when a metal react with water, a metal hydroxide and hydrogen are formed. for example sodium reacts vigorously with water

Qb and Qc I don't know properly

Answer 2

Answer:

Metals react with water to gorm metal oxide or metal hydroxide, which is basic in nature.