Question

With all the coefficient set to 1, how can you tell that the equation is not balanced?

Answer 1

Answer:

Well for any equation if all the coefficients are set to 1, this might result in unequal numbers of atoms of the same element on both sides

Explanation:

For example:

$A+B---->B_{2} + A_{2}$ (for this equation all the coefficient (the number before element) are 1 but you can clearly see it is not balanced because one side has 1 A atom and other side has 2 B atoms....therefore we need to balance em.

$2A+2B-----> A_{2} + B_{2}$ Here both atoms are balanced.