Question

what happens when i)sodium reacts with cold water ii)iron reacts with steam iii)zinc reacts with dilute HCl iv)copper reacts with dilute HCl v) copper kept in humid air of long time​

Answer 1

1 sodium vigorously react with water and produce heat and hydrogen
vigorously means in a soon time
sufficient heat is produce which are capable for burn hydrogen so that time H burn
iron react with steam slowly
Zn +HCl- than produce zinccloride and H
copper very slowly react with HCl and produce coppercloride and H
copper kept in humid at long time because they are very slowly react with other
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