Balancing Chemical Equations Practice/Review
Name:
Blk:___
Please identify the SUBSCRIPT ( # of atoms) within each compound below
1) CO2
2) H2O2
3) NaFCl3
4) Mg4O2
Please identify the COEFFICIENT of each compound below AND the # of atoms within each compound
1) 3NaCl2
2) 5LiFAg2
3) HeO3
4) 2Cu2N3
Please complete the following chemical equations. PLEASE SHOW ALL WORK!! Then IDENTIFY the
REACTANTS & PRODUCTS in each of the chemical reactions
1) 68 g of iron reacts with 150 g of chlorine to produce ____________g of iron chloride.
Reactant/s: ____________________
Product/s: _____________________
2) 52 g of hydrogen reacts with ________ g of Oxygen to produce 110 g of hydrogen peroxide.
Reactant/s: ____________________
Product/s: _____________________
3) _______ g of strontium reacts with 133 g of bromine to produce 184 g of strontium bromide.
Reactant/s: ____________________
Product/s: _____________________
4) Chemical A has a mass of 10 grams, and Chemical B has a mass of 16 grams. If Chemical A &
Chemical B combine to create a chemical reaction, what will be the mass of the
product?__________
5) The chemical formula for water is H2O, which means there are ____ H atoms for every ____ O atom.
If you have 4 molecules of H2O (4H2O), how many individual atoms of Hydrogen and Oxygen do you
have? ______ H
_______ O
5) 10 atoms of Nitrogen and 20 atoms of Oxygen go through a chemical reaction, how many
atoms of Nitrogen and Oxygen are present as the product at the end of this chemical reaction?
_____________
…..YES…there IS a BACK….PLEASE TURN PAPER OVER>>>>>>> NOW!! 
Balancing Chemical Equations Rules:
1) You CAN NOT change the ___________! Can ONLY change the ________________
2) It does NOT have to _________ the same on BOTH sides, it only has to be ______________!
3) You CAN NOT split COMPOUNDS to put in a ________________!
4) You can ONLY MULTIPLY through when it is a _______________, because they are already
_______
5) CAPITAL letters are each a ________________ ______________. A CAPITAL letter followed by
a lower case letter is all _________ __________________.
Balancing Chemical Equations:
1) Separate the _________________ from the _____________________ by drawing a line.
2) Write down the CHEMICAL SYMBOL of each of the __________________ on each side of the
equation.
3) Using the _____________ and __________________write down the number of each element.
4) If the _______________ and the __________________ are NOT balanced, change ONLY the
_______________ by using trial and error. You will have to go back and forth between each side.
Always ask yourself, “What is the smallest # that I can multiply the lower # by to equal it out?”