1. When a lump of zinc is added into copper sulfate solution, the two slowly react to produce very small dark copper granules and zinc sulfate solution.
Write down the word equation
Write down the symbol equation
Define ‘displacement reaction’

2. 1. Write down the chemical formulae for these ionic compounds:
Silver Chloride
Magnesium Sulfate
Sodium Hydroxide
Barium Carbonate
Potassium Nitrate
Iron (II) Sulfate
Zinc Hydroxide
2. Circle the insoluble compounds

3. Reactant(s) → Product(s)
Chemical Equations
Every chemical reaction has:
reactants (the stuff that react) and;
products (the stuff produced)
And the chemical equation always looks like:
Reactant(s) → Product(s)

4. One is simply the translated version of the other.
There are TWO types of chemical equations:
1. Word Equation
Calcium + Water → Hydrogen + Calcium Hydroxide
2. Symbol Equation
Ca H2O → H Ca(OH)2
One is simply the translated version of the other.

5. EXAMPLE ONE

6. EXAMPLE ONE
Magnesium burns very brightly when heated. After the combustion, magnesium oxide (the white powder/ash) remains.
What are the reactants? (hint: when something “burns” it reacts with oxygen)
What is the product?
Write down the chemical equation.

7. EXAMPLE TWO
Calcium metal reacts violently with water, producing hydrogen gas and calcium hydroxide.
Reactants:
Products:
Chemical equation:

8. EXAMPLE THREE
When sodium hydroxide and barium nitrate are mixed together, white/cloudy precipitate is formed.
Reactants:
Products:
Word equation:
Symbol equation:

9. When a lump of magnesium is dropped into a pool of hydrochloric acid, they react violently, producing hydrogen gas and magnesium chloride solution.
Word Equation:
Symbol equation:
Hydrochloric
Acid +
Magnesium →
Hydrogen
Gas
Chloride
HCl + Mg → H2
MgCl2

10. But there is a small problem…
Compare the number of hydrogen atoms on each side
Compare the number of chlorine atoms (ions) on each side
This is an ‘unbalanced’ symbol equation
HCl + Mg → H2
MgCl2

11. Is this equation now balanced?
*Balancing Symbol Equations
Balance the equation by writing the number(s) in front of the reactant(s) and/or product(s).
HCl Mg → H MgCl2
Is this equation now balanced?
Note: NEVER EVER change the formula of reactants or products 2

12. Balanced or Unbalanced?
H2 + O2 → H2O2
NaCl + AgNO3 → AgCl + NaNO3
CuSO Zn → ZnSO Cu
NaOH + ZnSO4 → Na2SO4 + Zn(OH)2
HCl NaOH → NaCl H2O
Mg O2 → MgO
H O2 → H2O
CaO HCl → CaCl H2O

13. 2 2 2 2 2 2 Balanced or Unbalanced? H2 + O2 → H2O2
NaCl + AgNO3 → AgCl + NaNO3
CuSO Zn → ZnSO Cu
NaOH + ZnSO4 → Na2SO4 + Zn(OH)2
HCl NaOH → NaCl H2O
Mg O2 → MgO
H O2 → H2O
CaO HCl → CaCl H2O 2 2 2 2 2 2

14. Copy all equations; find the THREE unbalanced equations and balance them.
a) Zn + Pb(NO3)2 → Pb Zn(NO3)2
Mg O2 → MgO
Fe CuSO4 → Cu FeSO4
H2O → H O2
HNO3 + Na2CO3 → NaNO3 + H2O + CO2