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BALANCING CHEMICAL
EQUATIONS
Guiroy, Blezy V.

UNLOCKING OF TERMS
• Matter
• Pure Substance
• Elements
• Compounds
• Chemical Reaction
• Chemical Equation

TERMS
MATTER
- anything that has space
and occupies mass
PURE SUBSTANCE
- sample of matter that has definite
chemical and physical properties.

TERMS
ELEMENT
- Simplest from of pure substance
COMPOUND
- pure substance that is made up of
two or more elements bonded chemically

MOLECULAR SHAPES
Pure
Substances
Made of one
type of matter
Elements
Made of one
type of atom
Compounds
Made of 2 or
More atoms bonded
together
Homogeneous
one phase
MATTER
Made of Atoms
Has Mass &
takes up Space
Heterogeneous
Made of more
than one phase
Can be separated
Mixtures
Made of
more than one
type of matter
Atom + Atom
= Element
Molecule + Molecule
= Compound
Atom + Atom
= Molecule
Example:
Juice
Examples:
Trail Mix
Salad

TERMS
CHEMICAL REACTIONS
- process in which the physical and
chemical properties of the original substances
change as new substances with different
physical and chemical properties are formed.
CHEMICAL EQUATION
- symbolic representation of a chemical
reaction in the form of symbols and chemical
formulas

H2 + O2  H2O
H O H2O
Reactant Product
Beginning of
the reaction
Formed after
the reaction

H2 + O2  H2O
H O H2O
+ 
H
H
H
H
O
O
O

LAW OF CONSERVATION
OF MASS
During chemical reaction, atoms are
neither created nor destroyed. The
number of atoms remains constant
throughout the reaction. Since the
number of atoms doesn’t change, the
mass must remain constant as well.

H2 + O2  H2O
H O H2O
+ 
+ 
H
H
O
O
H
H
O
H
H

H2 + O2  H2O
H O H2O
+ 
+ 
H
H
O
O
H
H
O
H
H
H
H
O

H2 + O2  H2O
H
H
H
H
O
O H
H
O

2H2 + O2  2H2O
H
H
H
H
O
O H
H
O

2H2 + O2  2H2O
BALANCED EQUATION
+ 
H
H
O
O
H
H
O
H
H
H
H
O

Na(NO3)2
2Na(NO3)2
O
O
O
O
O
O
N
N
Na
O
O
O
O
O
O
N
N
Na
O
O
O
O
O
O
N
N
Na

demonstration-balancing equation.pptx

Na + FeCl2  NaCl + Fe
When sodium metal reacts with
iron (II) chloride, iron metal and
sodium chloride are formed.

Na
Cl
Fe

Step 1. Identify the reactant and the product.
Reactant: Na + FeCl2
Product: NaCl+ Fe

Step 2. List all the elements found on the
chemical equation
__ Na + __ FeCl2  __ NaCl + __Fe
-Na-
-Fe-
-Cl-

Step 3. Identify the number of atoms
present in every element in the
reactant side
__ Na + __ FeCl2  __ NaCl + __Fe
1 -Na-
1 -Fe-
2 -Cl-

product side
__ Na + __ FeCl2  __ NaCl + __Fe
-Na- 1
-Fe- 1
-Cl- 1

Step 5. Check if the number of atoms
on both reactant and product side is
the same/balanced
__ Na + __ FeCl2  __ NaCl + __Fe
1 -Na- 1
1 -Fe- 1
2 -Cl- 1

Step 6. Write coefficient in each element/compound to
change the number of atoms in an element and check if
the number of atoms on both reactant and product side
is the same/balanced
__ Na + __ FeCl2  2NaCl + __Fe
1 -Na- 1
1 -Fe- 1
2 -Cl- 1

__ Na + __ FeCl2  2NaCl + __Fe
1 -Na- 1
1 -Fe- 1
2 -Cl- 2

__ Na + __ FeCl2  2NaCl + __Fe
1 -Na- 2
1 -Fe- 1
2 -Cl- 2

2Na + FeCl2  2NaCl + Fe
2 -Na- 2
1 -Fe- 1
2 -Cl- 2

NaOH + H2SO4  Na2SO4 + H2O
When dissolved sodium hydroxide
reacts with sulfuric acid, aqueous
sodium sulfate and water are
formed.

NaOH+ H2SO4  Na2SO4 + H2O
Step 1. Identify the reactant and the product.
Reactant: NaOH+ H2SO4
Product: Na2SO4 + H2O

Step 2. List all the elements found on the
chemical equation
__ NaOH + __ H2SO4  __ Na2SO4 + __H2O
-Na-
-OH-
-H-
-S-

reactant side
__ NaOH + __ H2SO4  __ Na2SO4 + __H2O
1 -Na-
6 -O-
3 -H-
4 -S-

product side
__ NaOH + __ H2SO4  __ Na2SO4 + __H2O
-Na- 2
-O- 5
-H- 2
-S- 1

Step 5. Check if the number of atoms
on both reactant and product side is
the same/balanced
__ NaOH + __ H2SO4  __ Na2SO4 + __H2O
1 -Na- 2
5 -O- 5
3 -H- 2
1 -S- 1

2 NaOH + H2SO4  Na2SO4 + 2 H2O
2 -Na- 2
5 -O- 5
3 -H- 2
1 -S- 1

2 NaOH + H2SO4  Na2SO4 + 2 H2O
2 -Na- 2
6 -O- 6
4 -H- 4
1 -S- 1

Test I.
Balanced Unbalanced
1AlBr3 + 6K  3KBr + 2Al
1FeO + 1PdF2  1FeF2 + 1PdO
1P4 + 6Br2  4PBr3
2LiCl + 1Br2  LiBr + 1Cl2
1PbBr2 + 2HCl  2HBr + 1PbCl2

Test II.
__ BeCl2 + __ AgNO3  __ Be(NO3)2 + __AgCl

Test I.
1P4 + 6Br2  4PBr3
Balanced Unbalanced

Test I.
Balanced Unbalanced
1FeO + 1PdF2  1FeF2 + 1PdO 1AlBr3 + 6K  3KBr + 2Al

Test I.
Balanced Unbalanced
1P4 + 6Br2  4PBr3

Test II.
– Be –
– Cl –
– Ag –
– N –
– O –

Test II.
1 – Be –
2 – Cl –
1 – Ag –
1 – N –
3 – O –

Test II.
1 – Be – 1
2 – Cl – 1
1 – Ag – 1
1 – N – 2
3 – O – 6

Test II.
__ BeCl2 + __ AgNO3  __ Be(NO3)2 + 2AgCl
1 – Be – 1
2 – Cl – 1x2=2
1 – Ag – 1x2=2
1 – N – 2
3 – O – 6

Test II.
__ BeCl2 + 2AgNO3  __ Be(NO3)2 + 2AgCl
1 – Be – 1
2 – Cl – 1x2=2
2=2x1 – Ag – 1x2=2
2=2x1 – N – 2
6=2x3 – O – 6

Test II.
Balanced Equation:
1BeCl2 + 2AgNO3  1Be(NO3)2 + 2AgCl
or
BeCl2 + 2AgNO3  Be(NO3)2 + 2AgCl

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demonstration-balancing equation.pptx

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