5 January 2011 Grab your clicker! Take Out: Week 17 Homework p. 1 Objective: SWBAT classify...

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

CompositionDecompositionSingle ReplacementDouble ReplacementCombustion

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

Li2OLi 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

ClOO

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

CuNa 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%




AB A + B

1 2 3 4 5

0%

100%

0%0%0%




AB + XY AY + XB

1 2 3 4 5

0% 0% 0%

100%

0%




A + O2 CO2 + H2O

1 2 3 4 5

8%

0%

83%

0%

8%




2H2O 2H2 + O2

1 2 3 4 5

0% 0% 0%0%0%




2C + O2 2CO

1 2 3 4 5

93%

0%7%

0%0%




Mg + CdCl2 Cd + MgCl2

1 2 3 4 5

0% 0% 0%

20%

80%




Al2(SO4)3 + 3Ca(OH)2 2Al(OH)2 + 3CaSO4

1 2 3 4 5

0% 0%7%

93%

0%




2C6H14 + 19O2 12CO2 + 14H2O + heat

1 2 3 4 5

0% 0%

100%

0%0%




BaO + H2O Ba(OH)2

1 2 3 4 5

100%

0% 0%0%0%




2NaNO3 2NaNO2 + O2

1 2 3 4 5

0%

100%

0%0%0%




AgNO3 + NaCl AgCl + NaNO3

1 2 3 4 5

0% 0% 0%

67%

33%




2Al + 3ZnCl3 3Zn + 2AlCl3

1 2 3 4 5

7%0% 0%

13%

80%




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 + heat3. 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

5 January 2011 Grab your clicker! Take Out: Week 17 Homework p. 1 Objective: SWBAT classify...

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