Types of Reaction and
Predicting Reactions
Concept Presentation
Winnie Ho
HS Science
Instructors Janine Extavour & Marty Zatzman
Goal of this presentation
Grade 10 teachers:
- Differences between Gr 10 and 11 and
how to prepare our students
Grade 11 teachers:
- What Gr 10 students know and
common roadblocks in this topic
Teaching sequence in 11U
• Unit 1- Matter, Chemical trends, and Chemical
Bonding
• Unit 2 - Chemical reaction
Prior knowledge:
- Ionic compounds and covalent molecules
- Nomenclature
- Balancing equation
- Classifying reactions
Curriculum expectation
Grade 10 – Chemistry expectations on types of reaction
C2.3
C3.5
investigate simple chemical reactions, including synthesis, decomposition, and
displacement reactions, and represent them using a variety of formats (e.g.,
molecular models, word equations, balanced chemical equations)
describe, on the basis of observation, the reactants in and products of a
variety of chemical reactions, including synthesis, decomposition, and
displacement reactions (e.g., reactions occurring when magnesium burns or in the
production of oxygen from hydrogen peroxide; the reaction of iron and copper
sulphate; reactions occurring when fossil fuels burn)
Grade 11 – Chemical reaction (selected expectations on types of reaction)
C2.4
predict the products of different types of synthesis and decomposition reactions
(e.g., synthesis reactions in which simple compounds are formed; synthesis
reactions of metallic or non-metallic oxides with water; decomposition reactions, in
which a chemical compound is separated into several compounds)
C2.5
predict the products of simple displacement reactions, using the metal activity
series and the halogen series.
C2.6
predict the products of double displacement reactions (e.g. formation of
precipitates or gases; neutralization)
C2.7
design an inquiry to demonstrate the difference between a complete and an
incomplete combustion reaction
C2. 10
plan and conduct an inquiry to demonstrate a simple displacement reaction, using
elements from the metal activity series
C3.1
identify various types of chemical reactions, including synthesis, decomposition,
single displacement, double displacement, and combustion
Comparison
Grade 10
- Classifying all four
reaction types
+ Neutralization
Grade 11
- All four reaction types
+ Activity series
+ Solubility rules
+ Neutralization
+ Combustion
+ Nuclear reactions
• Focus on lab inquiry
• Prediction of products
Diagnostic assessment
1. nitric acid + potassium hydroxide  ____________+
water
Type: ___________
2. zinc + ___________  zinc nitrate solution + copper
Type: ___________
3. __________ acid + zinc carbonate  zinc sulfate +
water + carbon dioxide
Type: ___________
4. calcium + chlorine  _____________________
Type: ___________
5. magnesium + hydrochloric acid  __________ +
hydrogen
Type: ___________
6. propane + oxygen  _____________________ + water
Type: ___________
Reaction Type
General Chemical Equation
A + B  AB
Synthesis

+
Decomposition
AB  A + B

+
Sodium and Chlorine reacts to form Sodium chloride
M + BC 
Single Displacement
+
AB + CD
Double Displacement
Combustion

N + BC 
+
+
MC
+
BN

 AD

+ B
+ C
+
+ CB
+
CxHy + _O2 _ CO2 +_ H2O
Roadblock #1
Failure to connect symbols to the actual
elements
A + B  AB
A can represent an element, a diatomic
molecule, or a compound.
The ordering of the symbols is important.
Can you find the mistakes?
Macroscopic
Microscopic
Symbolic
Roadblock #2
Predicting synthesis vs. combustion rxn
Grade 10 – synthesis reaction
Grade 11 –combustion reaction
•Reaction of a substance with
oxygen, producing oxides and
energy (Nelson text)
•Combustion of magnesium as an
example of a synthesis reaction
•Exothermic reaction
Synthesis Reaction!
Brad + Angelina  Brangelina
Tom + Katie  TomKat
Roadblock #3
Predicting single displacement reactions
Zn(s) + CuSO4(aq)--> ZnSO4(aq) + Cu(s)
Video
Safety
concerns:
Demo: Li, Na, K
with water
Goggles,
small quantity
Alternatives
M + BC  MC + B
M= metal element
N + BC  BN + C
N= non-metal element
Roadblock #4
Predicting double displacement reactions
If a reaction does not produce a
precipitate, a gas, or water, then it is
not a DD reaction.
Solubility table
KOH(aq) + NH4Cl (aq)--> No Reaction
KOH(aq) + NH4Cl (aq)--> no reaction
Use of states symbols are important
• More consistent usage of state symbols in
grade 10 when writing out chemical
equations.
e.g., NaOH(aq) + HCl(aq)  H2O (l) + NaCl (aq)
Societal implications
Synthesis reaction
Rusting, Galvanization, Alloy
Decomposition
reaction
Production of sodium using electrolysis of
molten sodium chloride
Single displacement
reaction
Extracting metals, smelting process, Bromine
compound as fire retardant
Double displacement
reaction
Geochemistry (solubility rules allows students
to understand why some elements exist as
compounds in nature), corrosion of statues
Combustion
Greenhouse effect
Computer resources
• Gizmos
• Metals in aqueous solutions simulation
Differentiated instruction
• Computer simulation (modified versions
of activities)
• Video
• Group work on making connections issues
Thank you.