balancing equations
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never change the __________, only add _______
chemical formula / coefficients
mass cannot be ______ or _______
created / destroyed
what is the Law of Conversation of Mass?
in a chemical reaction, the total mass of the reactants is always the same as the total mass of the products
the number of each type of atom is ______ before and after a chemical reaction
the same
the atoms of the reactants are ________ to form the products
rearranged
molecules can be split apart to form new molecules but _____________________________
the atoms in the products are the same atoms that were in the reactants
step 1 for balancing equations: count all the _____ on each side of the equation
atoms
polyatomic ions are broken down into ______
elements
step 2 for balancing equations: start balancing the _____ first, then the _____. leave ______ and _____ for last
metals / nonmetals / oxygen / hydrogen
step 3 for balancing equations: add a ______ in front of the chemical formula that needs to be _______
coefficient / balanced
why do we add coefficients?
so the number of atoms of each element on the reactant side = the number of atoms of each element on the product side