1. Chapter 8 Chemical Equations !
Word Equation – the names of the substances are given in
words for you to interpret.
Zinc plus Hydrochloric Acid yields Zinc chloride plus Hydrogen gas !
REACTANTS PRODUCTS

2. Interpreting chemical equations
Al (OH)3 + 3HCl AlCl3 + 3 H2O
Reacts To make And three
One
with 3 one FU of molecules
formula
molecules aluminum of water
unit of
of HCl chloride
aluminum
hydroxide
SO WHAT DOES THIS MEAN????

3. Ions in water solution
When ionic substances dissolve in water their crystal lattice
structure breaks up and they exist as IONS in water !
NaCl yields Na + plus Cl -
KCl yields K+ plus Cl-

4. Ionic equations and spectators !
• Ionic equations simply show what is
happening to the ions taking part in a
reaction.
• Spectator ions are those which do not
actually participate in the reaction.
• See solubility chart page 860

5. Write the NET ionic equation which
occurs when aqueous solutions of
zinc chloride and potassium
hydroxide react.
ZnCl2 (aq) + 2 KOH (aq) Zn (OH)2(s) + 2 KCl(aq)
Zn+2 + 2Cl-1 + 2K+ + 2OH- Zn(OH)2(s) + 2K+ + 2Cl-
Zn+2 + 2OH- Zn(OH)2(s)

6. Predict the products
When K reacts with MgF 2 Mg + KF
When Mg reacts with KF NO REACTION

7. Predict the products
NaOH + KCl
NaNO3+ KBr
Ammonium Carbonate + Magnesium carbonate as
precipitate and
Magnesium Chloride
ammonium ions and
chloride ions as
spectators