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Name: Class: Date: COUNTING ATOMS: Notes & Practice Law of Conservation of Mass: When you count atoms in a chemical formula or a chemical equation, you will deal with two types of numbers: coefficients and subscripts. Coefficients are BEFORE the element & they are multipliers. For example – There are 4 Hydrogen atoms on the reactant side of the example equation because 2 X 2 = 4. Subscripts go with the element they are BEHIND. For example – The 2 behind the Oxygen on the reactant side means there are 2 Oxygen atoms. Now you try – How many Hydrogens on the product side? ______ _ How many Oxygens on the product side? ________ Counting Atoms Sheet Write the number of atoms with the name of the element. For example, H 2O has 2 Hydrogen atoms and one Oxygen atom. 1) CaF2 ______________________________________________________ 2) Be(OH)2 ____________________________________________________ 3) NO2 ______________________________________________________ 4) Al2(SO4)3 ___________________________________________________ 5) NH4NO3 ____________________________________________________ 6) S2F2 ______________________________________________________ 7) Na2CO3 ____________________________________________________ 8) CH4 ______________________________________________________