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What does balancing a chemical equation mean?

A chemical reaction is balanced when the number of atoms of each element is the same on both sides of the equation

A chemical reaction is balanced when the number of molecules of each element is the same on both sides of the equation

A chemical reaction is balanced when the total number of electrons on both sides of the equation is the same

A chemical reaction is balanced when the total number of protons on both sides of the equation is the same

Which of the following is not a valid chemical equation?

2H2O + O2 -> 2H2O2

2H2O + O2 -> H2O2

2H2 + O2 -> 2H2O

2H2O2 + 2H2 -> 2H2O

When balancing a chemical equation, what is the first step?

Identify the reactants and products

Add coefficients to the reactants and products

Cross multiply the coefficients

Add subscripts to the reactants and products

Chemistry