1. Types of Chemical Reactions
Learning Goal
I will learn how to represent synthesis, decomposition and displacement chemical reactions using a variety of formats.
How are they useful?
How do we represent them?
What are synthesis, decomposition and displacement reactions?
SNC2D
Mr. Findlay

2. Review Chemical reactions happen all the time and can be very useful
We summarize reactions by writing __________ ____________
H2 + O2  H2O
chemical
equations
Reactant(s)
Product(s)

3. Review
__________: The finishing chemicals in a reaction (the chemicals produced) ___________: The starting chemicals in a reaction
Products
Reactants

4. Examples carbon dioxide water vapour + gasoline + oxygen   CO2(g) +
Gasoline burns in air (oxygen) and produces carbon dioxide and water vapour
Word Equation
Chemical Equation
carbon dioxide
water vapour +
gasoline +
oxygen  
CO2(g) +
H2O (g)
C8H18 +
O2(g)

5. Examples
Drano clears a drain when the sodium hydroxide and aluminum react with the water to create aluminum hydroxide, hydrogen and sodium ions
Word Equation
Chemical Equation
sodium ions
aluminum hydroxide
sodium
hydroxide +
hydrogen + +
aluminum +
water  + + 
Al(OH)3 +
H2(g)
Na+
NaOH +
Al(s)
H2O(l)

6. Synthesis & Decomposition
Types of Reactions
Synthesis
&
Decomposition

7. Synthesis – Putting Things Together
Example:
sodium + chlorine  sodium chloride
2 Na Cl2  NaCl
_______ reactants but ______ product
Predict the Product:
sodium + flourine  _____________________
Products
Reactants
Many
one
sodium fluoride

8. Decomposition – Taking Things Apart
Example:
water  hydrogen gas + oxygen gas
H2O(l)  H2 (g) O2 (g)
_______ reactant but ______ products.
Predict the Product:
beryllium fluoride  __________ + _________
One
many
beryllium
fluorine

9. Single Displacement
Single displacement reactions have ____ reactants and ___ products.
One of the reactants is an element (A), one is a compound (BC).
The single element (A) switches places with, or displaces, an element in the compound. 2 2

10. Single Displacement Video
The reaction between aluminum and iron(III) oxide releases so much heat that it can weld steel rails together.
aluminum + iron(III) oxide  aluminum oxide + iron
2 Al Fe2O  Al2O Fe
Video

11. Double Displacement
Double displacement involves two compounds as reactants that produces two other compounds.
Ions in the reactants trade places to form new compounds.

12. Double Displacement
The reaction of silver nitrate and sodium chloride produces a white precipitate.
silver nitrate + sodium chloride  silver chloride + sodium nitrate
AgNO3 (aq) NaCl (aq)  AgCl(s) NaNO3(aq)
Aqueous solutions (aq) are clear mixtures of substances dissolved in water.