5 January 2011

1. 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

2. Agenda • Do now • Homework solutions • Model Types of Reactions • Clicker Practice Problems • Stations Lab • Demo: Combustion • Hand back papers Homework: Week 17 Homework p. 2-3

3. Types of Chemical Reactions

4. 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)

5. Composition • Li + O2 Li2O Li O O

6. 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)

7. Decomposition KClO3  KCl + O2 K K O O Cl Cl O O O

8. 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

9. Single Replacement • KI + Br2 KBr + I2 K Br I Br

10. 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)

11. Double Replacement • CuCl2 + Na2S  2NaCl + CuS Cl Cl Na Na Cu S

12. 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)

13. A + Y  AY • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

14. A + BX  B + AX • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

15. AB  A + B • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

16. AB + XY  AY + XB • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

17. A + O2  CO2 + H2O • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

18. 2H2O  2H2 + O2 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

19. 2C + O2  2CO • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

20. Mg + CdCl2  Cd + MgCl2 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

21. Al2(SO4)3 + 3Ca(OH)2 2Al(OH)2 + 3CaSO4 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

22. 2C6H14 + 19O2 12CO2 + 14H2O + heat • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

23. BaO + H2O  Ba(OH)2 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

24. 2NaNO3  2NaNO2 + O2 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

25. AgNO3 + NaCl AgCl + NaNO3 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

26. 2Al + 3ZnCl3  3Zn + 2AlCl3 • Composition Reaction • Decomposition Reaction • Single Replacement Reaction • Double Replacement Reaction • Combustion Reaction

27. What does a combustion reaction require? • Heat • Oxygen • Carbon dioxide • Love • Gasoline

28. Which type of reaction? • Al2(SO4)3 + 3Ca(OH)2 2Al(OH)2 + 3CaSO4 • 2C6H14 + 19O2 12CO2 + 14H2O + heat • BaO + H2O  Ba(OH)2 • 2NaNO3  2NaNO2 + O2 • AgNO3 + NaCl AgCl + NaNO3 • 2Al + 3ZnCl3  3Zn + 2AlCl3 • What does a combustion reaction require?

29. 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

30. Agenda • Do now • Homework solutions • Finish lab stations • Demo: Combustion • Pass back papers/New Seat Requests Homework: Week 17 Homework p. 3

31. 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.

32. 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

33. 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.

34. 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.

35. 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!

36. Homework • Week 17 Homework Page 3