Question

What characterizes a chemical reaction?

Answer 1

You might have to reask this question.....because I am not seeing the premise.....

Explanation:

Some comments.....all chemical reaction conserve (i) mass, and (ii) charge......and so if we start with `10*g` of reactants from all sources, AT MOST we can get `10*g` of products. For methane combustion, for instance, we could write.....

`CH_4(g)+2O_2(g)rarrCO_2(g) + 2H_2O(l) + Delta`

And there are clearly `80*g` of reactant, and inevitably there are `44*g+2xx18*g=80*g` of product as required.

And likewise electrically neutral reactants give electrically neutral products. And thus charge will ALWAYS be conserved for a redox reaction:

`Al rarrAl^(3+) + 3e^-`

Anyway it's over to you. And please see this site should you want to format your question.

Cheers.........