Question

i)Write the chemical reaction for the following:
a) potassium with water
b) steam is passed over red hot iron
c)iron fillings with copper sulphate
ii) Calcium floats on water. Explain with the help of chemical equation.​

Answer 1

Answer:

SOLUTION:

An equation for the reaction of: a) iron with steam

When a metal reacts with steam then the products formed are metal oxide and hydrogen gas.

Metal + steam --------> Metal oxide + Hydrogen

When red hot iron reacts with steam to form iron(II, III) oxide and hydrogen.

3Fe(s) + 4H2O(g) steam -------> Fe3O4 (s) + 4H2(g)

b) calcium with water:

When a metal reacts with water( cold water or hot water) then the products formed are metal hydroxide and hydrogen gas.

Metal + steam --------> Metal hydroxide + Hydrogen

Calcium reacts with cold water to form calcium hydroxide and hydrogen gas:

Ca(s)+ 2H2O(l) --------> Ca(OH)2(aq) + H2(g)

c) potassium with water.

Potassium reacts violently with cold water to form potassium hydroxide and hydrogen gas:

2K(s)+ 2H2O(l) --------> 2KOH(aq) + H2(g) + heat.

In this reaction, so much heat is produced get hydrogen gas formed catches fire and burns explosively.

HOPE THIS WILL HELP YOU....

Answer 2

Answer:

(i)2K + 2H2O= 2KOH + H2

(ii)3Fe +4H2O=Fe3O4 + 4H2

(iii)Fe + CuSO4=Fe2SO4 +Cu

(iv)Ca+2H2O=Ca(OH)2+H2