CH4 + O2 > CO2 + 2H2O

Is this chemical equation balanced? If not explain what you would do to balance the equation.

The only thing not balanced is the Oxygen gas (O2). Since you have carbon dioxide, you have 2 oxygens there and 2 oxygens since there are 2 waters on the right. So you have 2 on the left and 4 on the right. To fix it, put a 2 on front of the O2 on the left and that should balance it.