Question

Balance the following chemical equations: a) Pb(NO3)2 → PbO +NO2+O2 b) Na+O2 →Na2O

Answer 1

Explanation:

Given -

• Chemical equation

To Do :-

• Balance it

1)

When lead nitrate is heated it breaks down into lead oxide, nitrogen dioxide and oxygen gas. (Decomposition reaction)

Chemical equation :-

2Pb(NO3)2 → 2PbO + 4NO2 + O2

2)

When Sodium is treated with oxygen it from sodium oxide. (Combination reaction)

Chemical equation :-

4Na + O2 → 2Na2O

Additional information :-

Types of chemical reaction :-

Combination reaction -

Those reaction in which two or more substances combined to form a single substance, are called combination reaction.

Example -

• C + O2 → CO2

Decomposition reaction -

Those reaction in which a compound splits up into two or more simpler substances are known as decomposition reaction.

Example -

• CaCO3 → CaO + CO2

Displacement reaction -

Those reaction in which one element takes the place of another element in a compound, are known as Displacement reaction.

Example -

• CuSO4 + Zn → ZnSO4 + Cu

Double Displacement reaction -

Those reaction in which two compounds react by an exchange of ions to form two new compounds are called double displacement reaction.

Example -

• AgNO3 + NaCl → AgCl + NaNO3

Answer 2

Answer:

Explanation:

You have to add coefficient so that the atoms of the elements in reactants and atoms of the elements in product become equal