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Name _____________________________ Counting Atoms In order to properly balance chemical equations, you must first be able to count the atoms involved in a reaction. A chemical compound may have subscripts and coefficients; these are numbers that tell you how many atoms of each element are present. Let’s practice counting atoms in the compounds below. Refer to page 35 in your book for additional help. CO2 1 carbon atom 2 oxygen atoms subscript subscript 2 CO2 2 x 1 = 2 carbon atoms 2 x 2 = 4 oxygen atoms coefficient coefficient subscript 1) O2 oxygen = ______ 2) H2 hydrogen = ______ 3) MgF2 magnesium = ______ 4) KCl potassium = ______ fluorine = _______ 5) HCl hydrogen = _______ chlorine = ______ 6) chlorine = _______ 7) CO2 carbon = ______ oxygen = ______ Na2O sodium = ______ oxygen = ______ 8) C6H12O6 carbon = _______ hydrogen = _______ oxygen = _______ 9) 2 NaOH 10) Al2(SO4)3 sodium = _____ aluminum = _____ oxygen = _____ sulfur = _____ hydrogen = _____ oxygen = _____ subscript
