Question

How are chemical equations balanced?

Answer 1

Chemical equations are balanced with respect to (i) mass, and (ii) charge.

Explanation:

A fixed mass of reactant, 10, 20, 30 g, gives a fixed mass of product, 10, 20, 30 g. Mass is conserved for every chemical reaction. Charge is also conserved for every reaction. See this [old answer.](https://socratic.org/questions/what-is-a-balanced-chemical-equation-how-would-you-use-the-law-of-conservation-o). We can sometimes balance mass and charge systematically and methodically by writing redox reactions .