Friday, Sept. 6th: “A” DayMonday, Sept. 9th: “B” Day

AgendaHomework Questions/CollectFinish 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, 14Activity Series WorksheetConcept 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. Combustion2. Synthesis (sometimes called combination)3. Decomposition4. Single Displacement 5. 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 reactantsIn 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 SeriesElements 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. 282Determining Products by Using the

Activity SeriesMagnesium 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. 282Determining 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 ExampleIf 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 atomNa + H2O NaOH + H2

Lastly, balance the equation:

2 Na + 2 H2O 2 NaOH + H2

Additional ExampleIf 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 ReactionsDouble 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 compoundsOne 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+ SO42- Sr 2+ NO3

1-

Na2SO4 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+ NO31- Sr2+ SO4

2-

NaNO3 (aq) SrSO4 (s)

Na2SO4 (aq) + Sr(NO3)2 (aq) NaNO3 (aq) + SrSO4 (s)Lastly, balance equation:Na2SO4(aq) + Sr(NO3)2 (aq) 2 NaNO3(aq) + SrSO4(s)

Additional ExamplePredict the products and write a balanced equation

when solutions of potassium carbonate and iron (III) chloride are mixed.

K+ CO32- Fe3+ Cl1-

K2CO3 FeCl3

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- Fe3+ CO32-

KCl (aq) 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)

HomeworkWow 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 Worksheet3.Concept Review: “Classifying Chemical Reactions”

Looking Ahead

Tuesday/Wednesday:Finish Chemical Formulas/Equations

worksheet8.3 Quiz:“Classifying Chemical Reactions”Lab write-up (you’ll need your lab folder!)

Thursday/Friday:Lab: “Classifying Chemical Reactions”