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Chemical Reactions
Balancing Chemical Equations
How to Balance Equations
Balancing Chemical Equations
100
What is the Reactant of the chemical equation and where is it located?
The reactant is the original equation and it is always located on the left side of the equation.
100
Balance the following equation: _____H2 + ____O2 ---> ____H2O
2 H2 + 1O2 ---> 2H2O
100

What is the FIRST step to balancing chemical equations?

List the elements on the reactants and products sides.

100

Balance the following equation:

___ H3PO4 + ___ Mg(OH)2 --> ___ Mg3(PO4)2 + ___ H2O

2 H3PO4 + 3 Mg(OH)2 --> 1 Mg3(PO4)2 + 6 H2O

200
What is the Product of a chemical equation and where is it located?
The product is the chemical change or new substance. It is always located on the right side of the equation.
200
Balance the following Equation: _____KClO3 ---> KCl + ______O2
2KClO3 ---> 2KCl + 3O2
200
Which part of the chemical equation are you to add or change.
The Coefficients
200

Balance the following equation:

___ Al (OH)3 + ___ H2CO3 --> ___ Al2(CO3)3 + ___ H2O

2 Al (OH)3 + 3 H2CO3 --> 1 Al2(CO3)3 + 6 H2O

300
Identify the reactants and products in the following chemical equation: H2 + NaCl ---> H2Na + Cl + S
Reactants: H, Na, Cl Products: H, Na, Cl, S
300
Balance the following equation: ____C3H8 + _____O2 ---> ____CO2 + ____H2O
1C3H8 + 5O2 ---> 3CO2 + 4H2O
300
Within a chemical formula, if you don't see a subscript, you can conclude that there are how many atoms of that element within each molecule.
One
300

Balance the following equation:

___ FeS2 + ___ O2 --> ___ Fe2O3 + ___ SO2

4 FeS2 + 11 O2 --> 2 Fe2O3 + 8 SO2

400
What does the law of conservation of mass states?
The law of conservation of mass states that matter durning a chemical change can neither be created nor destroyed.
400
Balance the following equation: ____P + _____O2 --->_____P2O5
4P + 5O2 ---> 2P2O5
400
What is the THIRD step of balancing a chemical equation?
The third step is to adjust the coefficient of each molecule to balance out equally.
400

Balance the following equation:

___ H3PO4 + ___ Ca(OH)2 --> ___ Ca3(PO4)2 + ___ H2O

3 H3PO4 + 2 Ca(OH)2 --> 1 Ca3(PO4)2 + 6 H2O

500
What is the meaning of a subscript? Also, how many atoms does each element have in the following chemical equation: NaOH + H2CO3 ---> Na2CO3 + H2O *Note - All the numbers are subscripts
A subscript is written below. Reactant - 1Na, 4O, 3H, 1C Product - 2Na, 1C, 4O, 2H
500
Balance the following equation: ___NaBr + ____CaF2 ---> ____NaF + ____CaBr2
2NaBr + 1CaF2 ---> 2NaF + 1CaBr2
500
What is one reason that we balance chemical equations?
To validate that the Law of Conservation of Mass is true.
500

Balance the following equation:

___ Ca3(PO4)2 + ___ SiO2 + ___ C --> ___ CaSiO3 + ___ CO + ___ P

1 Ca3(PO4)2 + 3 SiO2 + 5 C --> 3 CaSiO3 + 5 CO + 2 P