CHEMICAL REACTIONS
CH 5.1, 5.2, 5.3 STARTING AT PAGE 141
CHEMICAL REACTIONS WIKI
QUESTIONS 1-14 PAGE 147
CHEMICAL EQUATIONS - PART A Youtube 10 mins
CHEMICAL EQUATIONS – PART B Youtube 9 mins
CH 5.1 PAGE 142 – WHAT IS A CHEMICAL EQUATION?
 Chemical equation: a short-hand notation that scientists use to communicate what
happens during a chemical reaction
 Word equation: involves replacing the reactants and products with their chemical
names.
 Formula equation – uses the chemical formulas for the reactants and products.
Copy the formula
SHOWING STATES OF MATTER
BALANCED CHEMICAL EQUATIONS PG 143
Copy this section including the
definition and description below
Read the instructions but
copy the equations and
working. P 143
Read the instructions but
copy the equations and
working. P 143
Draw simple stick
models. P 144
Read the instructions but
copy the equations and
working. P 144
Chemical equations – Part B
Youtube 9 mins
Read each instruction/thinking
process, then write the equation as
directed on page 145. Then do the
interactive – Balancing Equations
Review Q’s 1-14 page 147
5.2 PAGE 149 CLASSIFYING CHEMICAL REACTIONS
 Decomposition reactions
 Combination reactions
 Precipitation reactions
 Oxidation and Reduction reactions
 Extraction of Metals
As you finish the notes – go on with the Unit Review questions on page 158 – answer
in full sentences where appropriate. Q 1-21 (leave out Q 16)
Copy all of the
above + the
reaction to the
right
Copy the definition
above + the blue
reactions to the
right
Copy the definition
above.
Copy these notes in
total.
Page 152
We are not doing
the section on
predicting
precipitates on page
152
NAMING IONIC COMPOUNDS PAGE152
 To name Ionic compounds simply place the cation first and the anion second
Ammonium, hydrogen carbonate, carbonate, nitrate
and phosphate are poly-atomic ions – they are treated
as a single entity with a set of brackets around the ion.
CROSSOVER RULE – BALANCED IONIC COMPOUNDS
Cross-over rule youtube - 5 mins
The superscript eg 3+ represents the ionic charge.
The subscript number represents the number of atoms of each ion in the neutral compound.
A number in front is call a coefficient that multiplies all atoms in the molecule.
Write balanced ionic formulae for the following ion compounds (page 152 or your notes)
Hydrogen fluoride
Potassium oxide
Ammonium bromide
Sodium hydrogen carbonate
Magnesium sulfate
Iron (III) oxide
Calcium nitride
Potassium iodide
Barium hydroxide
OXIDATION AND REDUCTION REACTIONS PAGE 153
Oxidation: when a substance gains oxygen atoms or loses electrons
Reduction: when a substance loses oxygen atoms or gains electrons
Redox: an abbreviation for oxidation and reduction pairs of reactions
OXIDATION – COMBUSTION PAGE 153
Combustion reaction: any chemical reaction where a substance burns in oxygen to
produce heat and light.
Read the explanation below and copy the equations.
OXIDATION – CORROSION PAGE 154
Corrosion is a natural process, which converts refined metal to their more
stable oxide. It is the gradual destruction of materials (usually metals) by chemical
reaction with their environment. In the most common use of the word,
this means electrochemical oxidation of metal (rusting) in reaction with an oxidant
such as oxygen.
Read the explanation
and copy the equations.
REDUCTION REACTIONS PAGE 154
Copy the definition, then read the
explanation and copy the equations.
Read the explanation and copy the blue definitions.
METAL DISPLACEMENT (REDOX) REACTIONS PAGE 154
Read the explanation
and copy the equations.
For replacement reactions to occur,
the solid metal (Zn) must be higher
on the reactivity scale than the ionic
solution ion (Cu) for this REDOX
reaction to occur.
Zn transfers electrons to Cu++ ions,
therefore Zn has been oxidized to
Zn+ (OILRIG).
Cu++ ions have been reduced as it
has gained electrons to become
Copper metal crystals (OILRIG).
EXTRACTION OF METALS
Activity series plays a large role in the extraction of metals.
1. Highly reactive metals such as K, Na and Mg are usually found in compounds or as
ions – therefore must be extracted by electrolysis – electrons are forced into the
ions, reducing them to their pure element.
2. The least reactive metals such as Ag and Au rarely form compounds and are regularly
found as pure elements in nature – froth floatation can be used for these P 156.
3. Zn, Fe, Pb, Sn, Cu can all be extracted by carbon reduction (heat and carbon)
Copy the definition below, then read the explanation and copy the equations.
P 156
ELECTROLYSIS PAGE 157
Reduction
Oxidation
REDOX
CH 5.3 RATES OF CHEMICAL REACTIONS
Reaction rates can be affected by the following factors. Increasing the following will
increase reaction rates by increasing the likelihood of particles interacting with one
another.
1. Temperature
2. Concentration
3. Surface area
4. Agitation
5. Catalysts such as enzymes increase the rate but are not consumed by the reaction.