Question

write the balanced chemical equation for the following reactions :
a)sodium reacts with oxygen .
b)aluminium reacts with dilute hydrochloric acid.​

Answer 1

Answer:

Na+o2----------->NNa2

2Na+o2----------->Na20

This is balance chemical reactions .

2.

Al + Hcl -------> Alcl3+H2

2Al + 6Hcl -------> 2Alcl3+3H2

This is balance chemical reactions.

Answer 2

Answer

Chemical equations are balanced to make them obey the law of conservation of mass

That is, total mass on LHS = total mass on RHS

1) Sodium reacts with oxygen to produce sodium oxide

This is given by

4Na + O₂ $\rightarrow$ 2Na₂O

2) Aluminium reacts with dilute hydrochloric acid to produce aluminium chloride and hydrogen gas

This is given by

2Al + 6HCl $\rightarrow$ 2AlCl₃ + 3H₂