How Do You Balance Sciencetific Equasions?

Question

Example:
H 2 O 2-----------> H 2 O + O2

Answer 1

The total elements at the left must equal the total elements at the right, when the reaction is written as an equation with the chemical formulas for reactant(s) => product(s).

In your example:
? H2O2 => ? H2O + ?O2 (initial equation with unknown quantities)
since H2O2 contains an even number of oxygen atoms, and so does O2, the number of H2O molecules must be even; the smallest & simplest even number >0 is 2
? H2O2 => 2 H2O + ?O2 (2 H2O put in per above)
2 H2O2 => 2 H2O + ?O2 (2 H2O2 molecules are required)
2 H2O2 => 2 H2O + 1O2 (4 O atoms = 2 +2)
2 H2O2 => 2 H2O + O2 (the "1" is unnecessary)
total reactants on either side: 4 H atoms, 4 O atoms

Answer 2

Haha this gets complicated but you must see how many hydrogens are on each side of the equation....you have 2 hydrogens on the left and 2 hydrogens on the right so your good with the hydrogens but things may change as we progress throught the equation....now we must check the oxygen's there's 2 on the left and 3 on the right.....so we have to find a way to match them or make the equal to each other.....so this is what your answer will look like 2H2O2----->2H2O+O2 hopefully you see how i did that....

Answer 3

you need the same ammount of each element on the left and the right of the equation..

2 H2O2 --------> 2H2O + O2

Answer 4

just make sure both sides have the same number of specific atoms on both sides. I assume you know how to figure taht out.