Question

what chemical eqns are balanced and why they are balanced???​

Answer 1

CHEMICAL EQUATIONS NEED TO BE BALANCED SO THAT BOTH THE REACTIONS AND PRODUCTS ON BOTH THE SIDES ARE EQUAL AND SAME...

FOR EG:

2MG + 2O2 ------》 2MGO

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Answer 2

All reactions follow the law of conservation of mass.

In case of chemical reactions this law is followed by ensuring that the number of atoms of each kind on each side are equal.

This also gives an idea of ratio of amount of product obtained to the reactants used