C: 12 January 2012

1. C: 12 January 2012 • Grab your green folder • Objective: You will be able to: • write correct formula equations for chemical reactions • Do now: Brainstorm: Write down as many indications (signs) of a chemical reaction as you can.

2. Agenda • Do now • Organize/stamp • Chemical reactions notes and demo • Writing equations examples • Practice problems Homework: Week 18 Homework #1-3, 7-9: Fri. Late work/Lab report rewrites by Weds. Jan. 18

3. 10 min. to organize • Organize your folder/notebook. • Stack up and paperclip all Unit 3 materials Put your tracking sheet on top. • Track your last Unit 3 Quiz. • Get stamps! • Put your papers in your green folder in the bin. **You must be in your seat unless you are putting your folder in the bin.**

4. Chemical Reactions

5. Demo • In your notebook, record your observations.

6. Indications of a Chemical Reaction • Heat and Light • Production of a Gas (bubbles) • Formation of a precipitate • A solid produced as a result of a reaction between two solutions • Color change

7. chemical reaction: changing substances to other substances by breaking bonds in reactants and forming new bonds in products.

8. http://www.youtube.com/watch?v=F54rqDh2mWA

9. Chemical Equations • How do chemists describe chemical reactions? • chemical equations: an expression representing a chemical reaction

10. Word Equation • Hydrogen gas combines (explosively!) with oxygen gas to produce water vapor • reactants: hydrogen, oxygen • products: water

11. Formula Equations • H2(g) + O2(g)  H2O(g) • (s) – solid, (l) – liquid, (g) – gas • (aq) – aqueous (dissolved in water) Reactants Products

12. Symbols • + and, reacts with •  yields (to yield), produces (to produce), forms (to form)

13. Diatomic molecules • 7 elements make diatomic molecules: • H2, N2, O2, F2, Cl2, Br2, I2 • “7 make a 7” • HINClBrOF

14. You must be sure to write correct chemical formulas for reactants and products!

15. Write the word equation • Na2O(s) + H2O(l) NaOH(aq) • Solid sodium oxide reacts with water to yield a solution of sodium hydroxide

16. Write the formula equation • Solid copper reacts with a solution of silver nitrate to yield solid silver and a solution of copper (II) nitrate. • Cu(s) +AgNO3(aq) Ag(s) + Cu(NO3)2(aq)

17. C: 13 January 2012 • Take Out Homework: Week 18 #1-3, 7-9 • Objective: You will be able to: • write correct formula equations for chemical reactions • Do now: Write the word equation: Zn(s) + HCl(aq)  ZnCl2(aq) + H2(g)

18. Agenda • Do now • Writing equations practice problems • Exit ticket Homework: Week 18 Homework #4-6 and 10-18: Wednesday Late work/Lab report rewrites by Weds. Jan. 18

19. Practice • Solid magnesium reacts with oxygen gas to yield solid magnesium oxide.

20. Practice Worksheet • Complete pages 3-4 with your partner

21. Exit ticket

22. Homework Week 18 Homework #4-6 and 10-18: Wednesday Late work/Lab report rewrites by Weds. Jan. 18

23. A: 12 January 2012 • Take Out Homework: Week 18 # 1-3, 7-9 • Objective: You will be able to: • write formula equations for chemical reactions • Do now: Write correct formulas for: • iron (III) oxide • nitrogen dioxide

24. Agenda • Do now • Check homework and answers • Writing formula equations practice Homework: Week 18 Homework #4-6 and 10-12 Late work/Lab report rewrites by Weds. Jan. 18

25. Writing Formula Equations • Complete pages 1-2 with your partner.

26. C: 18 January 2012 • Take Out Homework: Week 18 #4-6, 10-12 • Objective: You will be able to: • use the law of conservation of mass to balance chemical equations • Do now: Write the formula equation for: • Solid magnesium reacts with oxygen gas to yield solid magnesium oxide.

27. Agenda • Do now • Paperclip Mini-lab • Balancing Equations Examples • Practice Problems Homework: Finish paperclip mini-lab: Thurs. Week 18 Homework pages 5-6: Thurs.

28. Midterm Exam • Wednesday, January 25 • 10:15 am -12:05 pm • Bring a calculator, pens/pencils • You’ll get a periodic table and polyatomic ions list

29. Midterm Exam • 29 Questions, most with 2 parts • A mix of multiple choice and short answer/problem solving • Some have tier III questions – at end of test • On most objectives in Units 1-5 • Your review sheet will tell you which ones. • Very similar to quiz and homework questions you’ve seen.

30. Paperclip Mini Lab p. 1-2 • You and your partner share on bag of paperclips. • Follow the directions exactly. • Be sure to record data as specified by the directions. • To bond, unlink paperclips completely from the original compounds and then relink them to form the new compound. • Unlink all paperclips and return to bag when you finish!

31. Law of Conservation of Mass

32. In a chemical reaction, matter is never created or destroyed. • The number of atoms and the mass of each element of the reactants must be equal to the number of atoms and the mass of element of the products.

33. This is shown by placing a coefficient in front of the formula for each compound.

34. O O H O H O H O H O C H O C H O C H O C H O C H O C H O C H C H C C C C

35. O O O O O O O O O O O O H H H H H H H H H H H H

36. O O C C C H H O C C C O C C H H C C O H O H C H H O O H H O C O H H O O

37. H2(g) + F2(g)  HF(g) • H2(g) + F2(g)  HF(g) 2

38. H2O(l)  H2(g) + O2(g) • H2O(l)  H2(g) + O2(g) 2 2

39. Balancing Chemical Equations • Ca(s) + S8(s)  CaS(s) • Ca(s) + S8(s)  CaS(s) 8 8

40. Zn(s) + HCl(aq)  ZnCl2(aq) + H2(g) • Zn(s) + HCl(aq)  ZnCl2(aq) + H2(g) 2

41. Balancing Equations • H2 + O2 H2O • ZnS + O2ZnO + SO2 • Ag3PO4+ KBrK3PO4+ AgBr • H2SO3+ O2 H2SO4 • Na2SO4+ Fe(NO3)3NaNO3+ Fe2(SO4)3 • AgNO3+ CaCl2AgCl+ Ca(NO3)2

42. Now: • Finish the paperclip lab page 3 • Rank your studying priorities on pages 1-3 of the midterm review guide • Both of these things are due tomorrow!

43. Assignment • Paperclip Mini-lab Handout • with your partner

44. Homework • Finish paperclip mini-lab • Week 18 Homework pages 5-6 • both due tomorrow

45. C: 19 January 2012 • Take Out Homework: Paperclip Mini-Lab and Midterm Review Packet • Objective: You will be able to: • balance chemical equations to satisfy the law of conservation of mass and review for the midterm • Do now: Write and balance: • Solutions of silver nitrate and calcium chloride react to form solid silver chloride and a solution of calcium nitrate.

46. Agenda • Do now • Homework answers • Writing and balancing equations practice challenge! • Unit 1 Review • Midterm review packet work time Homework: Finish Unit 1 Review questions AND Priority 1 and 2 Questions: Fri.

47. On your Priorities Ticket • Write down your top three priority units. • We’ll use these to make work groups tomorrow and Monday.

48. Midterm Exam • Wednesday, January 25 • 10:15 am -12:05 pm • Bring a calculator, pens/pencils • You’ll get a periodic table and polyatomic ions list

49. Midterm Exam • 29 Questions, most with 2 parts • A mix of multiple choice and short answer/problem solving • Some have tier III questions – at end of test • On most objectives in Units 1-5 • Your review sheet will tell you which ones. • Very similar to quiz and homework questions you’ve seen.

50. Unlock the Code! • With your partner, write and balance four equations. • Place the correct coefficients into the blanks at the top of the page. • Come up and try the lock! • Hand in your worksheet. • Start Unit 1 Review problems with your partner.