How do you combine half reactions?

[Jorja De Jesus 2C]

Do you put all the reactants of each reaction together and all the products of each reaction together?

[Alice Ma 2K]

Yes, and the electrons in both equations would cancel out with each other so you'll just be left with the products and reactants.

[preyasikumar_2L]

Yes, but you may need to multiply the half reactions by constants in order to get electrons or repeating reactants and products equal in order to cancel out completely.

[ashwathinair]

So would this be similar to how in Hess's law we would add intermediate equations to make the final reaction?

[Matt F]

^You could say that. I think combining half reactions is less about cancelling out reactants/products and more about fitting them on both sides of the reaction, but it's the same concept