Friday, Sept. 6th: “A” Day
Monday, Sept. 9th: “B” Day
Agenda
Homework Questions/Collect
Finish Sec. 8.3: “Classifying Chemical Reactions”
Single and double displacement reactions,
activity series
Homework:
Sec. 8.3 review, pg. 285: 5-7, 8a,d,e, 9a-d, 10c,d,
11, 13, 14
Activity Series Worksheet
Concept Review, “Classifying Chemical Reactions”
Homework Questions
Sec. 8.3 review, pg 285:
1-4, 8b,c,f, 10a,b,e,f, 12
Practice box, pg. 279: #1-4
5 Types of Chemical Reactions
1.
2.
3.
4.
5.
Combustion
Synthesis (sometimes called combination)
Decomposition
Single Displacement
Double Displacement
Single Displacement Reactions
Single Displacement Reaction: a reaction in which
a single element reacts with a compound and
displaces another element from the compound.
Products are a different element and a different
compound than the reactants
In general, a metal may displace another metal,
or hydrogen, while a non-metal may displace
only another non-metal
2 Al(s) + 3 CuCl2(aq)  2 AlCl3(aq) + 3 Cu(s)
(Al displaces Cu)
The Activity Series Ranks Reactivity
How do you know whether an element will
replace another element or not?
Use the activity series table…
Activity Series: a series of elements that have
similar properties and that are arranged in
descending order of chemical reactivity.
Activity Series
Elements are arranged in order of activity with
the MOST ACTIVE at the top.
In general, an element can displace those
listed BELOW it from compounds in solution,
but NOT those listed above it.
The activity series can be used to make
predictions about displacement reactions.
When a metal is placed in water, the activity
series will help tell if hydrogen is displaced. If
this happens, a metal hydroxide and hydrogen
gas will form.
Partial Activity Series
(complete series on pg. 832 in text)
Sample Problem E, Pg. 282
Determining Products by Using the
Activity Series
Magnesium is added to a solution of lead(II) nitrate.
Will a reaction happen? If so, write the equation
and balance it.
Reactants: Magnesium, Mg, and lead (II) nitrate.
What is the formula for lead (II) nitrate?
Pb2+ NO31-
Pb(NO3)2
Sample Problem E, Pg. 282
Determining Products by Using the
Activity Series, cont.
Mg + Pb(NO3)2
?
Check the activity series: Mg is MORE reactive
than Pb, so it WILL displace Pb.
Mg + Pb(NO3)2
Mg(NO3)2 + Pb
Lastly, balance the equation: It already is! 
Additional Example
If the reaction happens, write a balanced equation
if sodium is placed in cold water.
Reactants: Sodium, Na, and cold water, H2O.
Check the activity series: Na reacts with cold
water to displace a hydrogen atom
Na + H2O
NaOH + H2
Lastly, balance the equation:
2 Na + 2 H2O
2 NaOH + H2
Additional Example
If the reaction happens, write a balanced equation
for the reaction if gold is added to a solution of
calcium chloride.
Reactants: Gold, Au, and calcium chloride, CaCl2
Check the activity series: Gold is LESS reactive
than Ca, so it WILL NOT displace Ca – no reaction
happens.
Au (s) + CaCl2 (aq) = No Reaction!
Double Displacement Reactions
Double displacement reaction: a reaction in
which a gas, a solid precipitate, or a molecular
compound forms from the apparent exchange
of atoms or ions between compounds.
2 compounds appear to exchange ions and
form 2 new compounds
One of the products must be a solid
precipitate, a gas, or a molecular
compound, such as water. (see table)
Water is often written as HOH in these
reactions.
Identifying Reactions and Predicting Products
Pg. 284 in your textbook
has a really nice skills
toolkit to help identify
reaction types and
predict products.
If product is not soluble,
it will be a solid
precipitate.
Double Displacement Reactions
HCl(aq) + NaOH(aq)  HOH(l) + NaCl(aq)
When solutions of hydrochloric acid, HCl, and
sodium hydroxide, NaOH, are mixed, a double
displacement reaction occurs, creating a
molecular compound, water, and sodium
chloride.
Double Displacement Reaction Example
Predict the products and write a balanced equation
when solutions of sodium sulfate and strontium
nitrate are mixed.
Na+ SO42Sr 2+ NO31Na2SO4
Sr(NO3)2
Reactants: Na2SO4 (aq) and Sr(NO3)2 (aq)
This is a double displacement reaction so the 2
compounds will switch ions…
Double Displacement Reaction
Example, cont.
Na2SO4 (aq) + Sr(NO3)2 (aq)
?
Na+ NO31Sr2+ SO42NaNO3 (aq)
Na2SO4 (aq) + Sr(NO3)2 (aq)
Lastly, balance equation:
Na2SO4(aq) + Sr(NO3)2 (aq)
SrSO4 (s)
NaNO3 (aq) + SrSO4 (s)
2 NaNO3(aq) + SrSO4(s)
Additional Example
Predict the products and write a balanced equation
when solutions of potassium carbonate and iron
(III) chloride are mixed.
K+ CO32K2CO3
Fe3+ Cl1FeCl3
Reactants: K2CO3 (aq) and FeCl3(aq)
This is a double displacement reaction so the 2
compounds will switch ions…
Additional Example, cont.
K2CO3 (aq) + FeCl3(aq)
K1+ Cl1-
KCl (aq)
?
Fe3+ CO32-
Fe2(CO3)3 (s)
K2CO3 (aq) + FeCl3(aq)
KCl (aq) + Fe2(CO3)3 (s)
 Lastly, balance equation:
3 K2CO3 (aq) + 2 FeCl3(aq)
6 KCl (aq) + Fe2(CO3)3 (s)
Homework
Wow guys, I know we covered a lot of material in
this section, but you guys stayed with me!
1. Section 8.3 review, pg. 285: #5-7, 8a,d,e, 9a-d,
10c,d, 11, 13, 14
2. Activity Series Worksheet
3. Concept Review: “Classifying Chemical Reactions”
Looking Ahead
Tuesday/Wednesday:
Finish Chemical Formulas/Equations
worksheet
8.3 Quiz:“Classifying Chemical Reactions”
Lab write-up (you’ll need your lab folder!)
Thursday/Friday:
Lab: “Classifying Chemical Reactions”