5 January 2011
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Transcript of 5 January 2011
5 January 2011
Grab your clicker! Take Out: Week 17 Homework p. 1 Objective: SWBAT classify reactions
as one of the five types of chemical reactions.
Do now: Which types of reactions?a) 2NaNO3 2NaNO2 + O2
b) AgNO3 + NaCl AgCl + NaNO3
Agenda
I. Do nowII. Homework solutionsIII. Model Types of ReactionsIV. Clicker Practice ProblemsV. Stations LabVI. Demo: CombustionVII. Hand back papersHomework: Week 17 Homework p. 2-3
Types of Chemical Reactions
Reaction Type
GeneralEquation
Definition Example
Composition
Decomposition
Single Replacement
Double Replacement
Combustion
Composition Reaction
• General Equation: A + X AX
• Definition: two or more substances combine to form a new compound.
• Example: 4Li(s) + O2(g) 2Li2O(s)
Composition
Li + O2
O
Li2O
Li O
Decomposition Reaction
• General Equation: AX A + X
• Definition: a single compound breaks down into two or more simpler substances.
• Example: 2H2O(l) 2H2(g) + O2(g)
Decomposition
KClO3 KCl + O2
K
ClO
OO
K
Cl
OO
Single Replacement Reaction
General Equation: A + BX AX + B
Definition: One element replaces a similar element in a compound.
Example:Mg + 2HCl H2 + MgCl2
2Al + Pb(NO3)2 3Pb + 2Al(NO3)3
Single Replacement
KI + Br2 KBr + I2
BrK
BrI
Double Replacement Reaction
General Equation: AX + BY AY + BX
Definition: the ions of two compounds exchange places in an aqueous solution to form two new compounds.
Example: 2KI(aq) + Pb(NO3)2(aq) PbI2(s) + 2KNO3(aq)
Double Replacement
CuCl2 + Na2S 2NaCl + CuS
Cl Cl
Cu
Na Na
S
Combustion Reaction
General Equation: CxHy(g) + O2(g) CO2(g) + H2O(g)
Definition: a substance combines with oxygen and releases a large amount of heat (exothermic) or light energy
Example: C2H6(g) +O2(g) CO2(g) + H2O(g)
A + Y AY
1 2 3 4 5
100%
0% 0%0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
A + BX B + AX
1 2 3 4 5
0% 0% 0%0%
100%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
AB A + B
1 2 3 4 5
0%
100%
0%0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
AB + XY AY + XB
1 2 3 4 5
0% 0% 0%
100%
0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
A + O2 CO2 + H2O
1 2 3 4 5
8%
0%
83%
0%
8%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
2H2O 2H2 + O2
1 2 3 4 5
0% 0% 0%0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
2C + O2 2CO
1 2 3 4 5
93%
0%7%
0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
Mg + CdCl2 Cd + MgCl2
1 2 3 4 5
0% 0% 0%
20%
80%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
Al2(SO4)3 + 3Ca(OH)2 2Al(OH)2 + 3CaSO4
1 2 3 4 5
0% 0%7%
93%
0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
2C6H14 + 19O2 12CO2 + 14H2O + heat
1 2 3 4 5
0% 0%
100%
0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
BaO + H2O Ba(OH)2
1 2 3 4 5
100%
0% 0%0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
2NaNO3 2NaNO2 + O2
1 2 3 4 5
0%
100%
0%0%0%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
AgNO3 + NaCl AgCl + NaNO3
1 2 3 4 5
0% 0% 0%
67%
33%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
2Al + 3ZnCl3 3Zn + 2AlCl3
1 2 3 4 5
7%0% 0%
13%
80%
1. Composition Reaction2. Decomposition Reaction3. Single Replacement
Reaction4. Double Replacement
Reaction5. Combustion Reaction
What does a combustion reaction require?
1 2 3 4 5
7%
80%
0%7%7%
1. Heat2. Oxygen3. Carbon dioxide4. Love5. Gasoline
Which type of reaction?
1. Al2(SO4)3 + 3Ca(OH)2 2Al(OH)2 + 3CaSO4
2. 2C6H14 + 19O2 12CO2 + 14H2O + heat
3. BaO + H2O Ba(OH)2
4. 2NaNO3 2NaNO2 + O2
5. AgNO3 + NaCl AgCl + NaNO3
6. 2Al + 3ZnCl3 3Zn + 2AlCl3
7. What does a combustion reaction require?
5 January 2011
Take Out Homework: Writing/Balancing Equations Worksheet AND Week 17 Homework p. 1
Objective: SWBAT classify reactions as one of the five types of chemical reactions.
Do now: Which types of reactions?a) 2NaNO3 2NaNO2 + O2
b) AgNO3 + NaCl AgCl + NaNO3
Agenda
I. Do nowII. Homework solutionsIII. Finish lab stationsIV. Demo: CombustionV. Pass back papers/New Seat
RequestsHomework: Week 17 Homework p. 3
Reactions Stations Lab
6 stations – 10 minutes each 4 stations are chemical reactions
SAFETY needs to be a priority GOGGLES are at the stations where
they are required – wear them! 2 stations are practicing moles-moles
and mass-mass stoichiometry Do station 2 and then station 5, even
if you come to station 5 first.
Reactions Stations lab
Will collect packet at end of class for a lab grade
Take your notebook, the lab packet, a pencil, a calculator, and a periodic table with you
Demo: Combustion
2HCl(aq) + 2Mg(s) H2(g) + 2MgCl(aq)
2H2(g) + O2(g) 2H2O(g) + heat There’s no carbon dioxide because
our fuel (H2) contains no carbon. This is a very simple combustion.
Seat Requests
Flip the page so that “front” is in front.
Write 1, 2 and 3 for your top three choices of places to sit.
Write the names of TWO people you work well with.
Write your name on the paper.
Progress Reports
Do NOT include a lab report grade for the hydrate lab.
Not turning this in WILL lower your grade!
After I grade it, that grade WILL affect your grade!
Homework
Week 17 Homework Page 3