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) 2NaNO 3  2NaNO 2 + O 2 b) AgNO 3 + NaCl  AgCl + NaNO 3

Agenda I. Do now II. Homework solutions III. Model Types of Reactions IV. Clicker Practice Problems V. Stations Lab VI. Demo: Combustion VII. Hand back papers Homework: Week 17 Homework p. 2-3

Types of Chemical Reactions Reaction TypeGeneral Equation DefinitionExample 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) + O 2 (g)  2Li 2 O(s)

Composition  Li + O 2  O Li 2 O Li O

Decomposition Reaction General Equation: AX  A + X Definition: a single compound breaks down into two or more simpler substances. Example: 2H 2 O(l)  2H 2 (g) + O 2 (g)

Decomposition KClO 3  KCl+ O 2 K Cl O O O K O O

Single Replacement Reaction General Equation: A + BX  AX + B Definition: One element replaces a similar element in a compound. Example:Mg + 2HCl  H 2 + MgCl 2 2Al + Pb(NO 3 ) 2  3Pb + 2Al(NO 3 ) 3

Single Replacement  KI + Br 2  KBr + I 2 Br K I

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(NO 3 ) 2 (aq)  PbI 2 (s) + 2KNO 3 (aq)

Double Replacement  CuCl 2 + Na 2 S  2NaCl + CuS Cl Cu Na S

Combustion Reaction General Equation: C x H y (g) + O 2 (g)  CO 2 (g) + H 2 O(g) Definition: a substance combines with oxygen and releases a large amount of heat (exothermic) or light energy Example: C 2 H 6 (g) +O 2 (g)  CO 2 (g) + H 2 O(g)

A + Y  AY 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

A + BX  B + AX 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

AB  A + B 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

AB + XY  AY + XB 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

A + O 2  CO 2 + H 2 O 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

2H 2 O  2H 2 + O 2 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

2C + O 2  2CO 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

Mg + CdCl 2  Cd + MgCl 2 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

Al 2 (SO 4 ) 3 + 3Ca(OH) 2  2Al(OH) 2 + 3CaSO 4 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

2C 6 H O 2  12CO H 2 O + heat 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

BaO + H 2 O  Ba(OH) 2 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

2NaNO 3  2NaNO 2 + O 2 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

AgNO 3 + NaCl  AgCl + NaNO 3 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

2Al + 3ZnCl 3  3Zn + 2AlCl 3 1. Composition Reaction 2. Decomposition Reaction 3. Single Replacement Reaction 4. Double Replacement Reaction 5. Combustion Reaction

What does a combustion reaction require? 1. Heat 2. Oxygen 3. Carbon dioxide 4. Love 5. Gasoline

Which type of reaction? 1. Al 2 (SO 4 ) 3 + 3Ca(OH) 2  2Al(OH) 2 + 3CaSO C 6 H O 2  12CO H 2 O + heat 3. BaO + H 2 O  Ba(OH) NaNO 3  2NaNO 2 + O 2 5. AgNO 3 + NaCl  AgCl + NaNO Al + 3ZnCl 3  3Zn + 2AlCl 3 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) 2NaNO 3  2NaNO 2 + O 2 b) AgNO 3 + NaCl  AgCl + NaNO 3

Agenda I. Do now II. Homework solutions III. Finish lab stations IV. Demo: Combustion V. Pass back papers/New Seat Requests Homework: 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)  H 2 (g) + 2MgCl(aq)  2H 2 (g) + O 2 (g)  2H 2 O(g) + heat  There’s no carbon dioxide because our fuel (H 2 ) 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