1. STARTER
Match the formula on the front of your booklet with it’s correct name
You have 3 min!

2. H NO3
Zn Cl2
H2 SO4
Cu Cl2
Ca (OH)2
Ca CO3
Ag Br
Na OH
Ag2 O
Ca SO4
Cu O
Mg O
Ag NO3
H Cl
Na2 SO4
Na Cl

3. Balancing Equations Everyone should:
Be able to balance simple equations that use up to 3 valence electrons
Most people will:
Balance equations using compounds like
OH-
NO3 -
SO4 2-
Some people will:
Be able to balance equations with unusual compounds not covered in class

4. IMPORTANT
ATOMS CANNOT BE CREATED OR DESTROYED!

5. Remember: Hydrogen and Chlorine are diatomic
Hydrogen + chlorine  hydrogen chloride H2 + Cl2  HCl
Remember: Hydrogen and Chlorine are diatomic  +
REACTANTS
2 H atoms
2 Cl atoms
PRODUCTS
1 H atom
1 Cl atom
This is impossible as it implies that atoms have been destroyed.

6. What do we do?
We need to make the number of atoms equal on both sides of the equation, in order to get the equation to BALANCE.

7. What do we do?
We need to make the number of atoms equal on both sides of the equation, in order to get the equation to BALANCE.
Equation is now balanced, as there are the same number hydrogen atoms (2) and the same number of chlorine atoms (2) on the products and reactant side.

8. Firstly you need an equation with the correct “formulae” in………
Firstly you need an equation with the correct “formulae” in………. You’ll probably be given this in the question
Just like this one
Mg + O2  MgO
Then all you do is list the atoms that are involved on each side of the arrow
Mg + O2  MgO Mg O

9. Mg + O2  MgO Mg + O2  MgO 2 Then start balancing:
[1] Just count up the atoms on each side
Mg + O2  MgO Mg O 1 1 2 1
[2] The numbers aren’t balanced so then add “BIG” numbers to make up for any shortages
Mg + O2  MgO Mg O 1 2 2 2 2
And adjust totals

10. WE SAY THAT THE EQUATION IS BALANCED!!
But the numbers still aren’t equal, so add another “BIG” number 2
Mg + O2  MgO Mg O 1 2 2
And adjust totals again
NOW BOTH SIDES HAVE EQUAL NUMBERS OF ATOMS
WE SAY THAT THE EQUATION IS BALANCED!!

11. Why didn’t anyone tell me it was so easy to balance equations???!!!
GROUP ACTIVITY: Try to balance these equations using the same method
You have 5 min!
Why didn’t anyone tell me it was so easy to balance equations???!!!
[1] Na + Cl2  NaCl
[2] CH4 + O2  CO2 + H2O
[3] Li + HNO3  LiNO3 + H2
[4] Al + O2  Al2O3

12. How did you get on??
Here are the answers:
[1] 2 Na + Cl2  2 NaCl
[2] CH O2  CO H2O
[3] 2 Li + 2 HNO3  2 LiNO3 + H2
[4] 4 Al + 3 O2  2 Al2O3

13. Examples 2 2 2 2 3 4 2 2 2