Question

Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

Answer 1

The answer to your question is Coefficients. 

*Hope this helps you! Feel free to message me if you have any further questions. Have a nice day! :)*

Answer 2

Answer: Charlie must add coefficients in front of the compounds that are written in the equation.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. In a chemical reaction, total number of atoms on the reactant side must be equal to the total number of atoms on the product side.

For Example: The formation of water follows the given chemical equation:

$2H_2+O_2\rightarrow 2H_2O$

The coefficients 2 is added in front of hydrogen and water molecule, so that the total atoms becomes balanced.

Hence, Charlie must add coefficients in front of the compounds that are written in the equation.