1. Single and double displacement reactions

2. Learning goals
We are learning to identify single and double displacement reactions.
We are learning to predict products of single and double displacement reactions.

3. Recall
Most chemical reactions fall into the five families of reactions that we will be studying in our course:
Synthesis
Decomposition
Single Displacement
Double Displacement
Combustion
Today we will focus on single and double displacement reactions.

4. Reactivity Series of Metals
The single and double displacement reactions are governed by the reactivity series of metals.
A higher reactive metal will displace a lower reactive metal but not vice-versa.

5. Single Displacement Reaction
Have the skeleton form:
Very similar to a dance:
B & C are “dancing” together.
A asks to cut in, now A & C are “dancing” together.
The “cut in” only happens if A is more reactive than B
A + BC
AC + B

6. Example #1
Given the word equation of the single displacement reaction below, determine the balanced chemical equation.
Zinc + Hydrochloric Acid  Zinc Chloride + Hydrogen Gas

7. Solution
Zn + 2
HCl
H2 +
ZnCl2
# R
Atom
# P 1 Zn 1 2 2 1 Cl 1 2 H 2

8. Double Displacement Reaction
Have the skeleton form:
Very similar to “snowball” in a dance:
Two couples AB & CD are dancing together.
They hear snowball then AD & CB are now dancing together.
AB + CD
AD + CB

9. Example #2
Given the word equation of the double displacement reaction below, determine the balanced chemical equation.
Iron (II) Sulfide + Hydrochloric Acid  Iron (II) Chloride + Hydrogen Sulfide

10. Solution FeS + 2 HCl FeCl2 + H2S # R Atom # P 1 Fe 1 1 2 Cl 2 1 S 1 1

11. Learning goals
We are learning to identify single and double displacement reactions.
We are learning to predict products of single and double displacement reactions.

12. Homework
P.243 #3-5, 7, 8