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C: 13 Dec. 2010

C: 13 Dec. 2010. Objective : SWBAT peer edit a classmate’s lab report. Do now : What was the most difficult lab report section to write? Why?. Agenda. Do now Review percent composition Peer Editing How-to Peer Editing Work Time Get back your own lab report

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C: 13 Dec. 2010

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  1. C: 13 Dec. 2010 • Objective: SWBAT peer edit a classmate’s lab report. • Do now: What was the most difficult lab report section to write? Why?

  2. Agenda • Do now • Review percent composition • Peer Editing How-to • Peer Editing Work Time • Get back your own lab report Homework: Hand in any missing work and/or schedule an appointment to take a missed test or quiz or re-quiz!! Final lab report due next Monday!

  3. Final draft of lab report • Do you want more advice on improving your lab report? • Come for extra help today or tomorrow at 3:30 in 203!

  4. Percent Composition Percent of water in CuSO4∙5H2O

  5. Peer editing • Reach each section of the lab report and circle the box on the rubric (p. 1) that best describes the qualities of that section. Do not give points! • While you read, fill in the chart on page 2 (what works well, suggestions for improvement) • Give one specific praise or suggestion for each box!!

  6. Then… • Give a score 1, 2, or 3 for each statement in part 3 • Give the top 3 things for the person to focus on when revising. • If they only fixed three things, what should they be?!

  7. For example • For the Data and Results part What works well: Your descriptions of your qualitative data are complete and thoughtful! Suggestions for Improvement: You should explain what you are doing for each step of your calculations.

  8. Three Things…Example • Write your procedure as paragraphs, not a list. • Include a calculation for actual percent composition for water in the hydrate. • Include one more error and how it affected your results.

  9. For the rest of the period…. • Work quietly on your own. • If you’re not sure how to score a section, or what to write, you may quietly ask your partner or me. • Return the lab report and two page handout to me.

  10. Homework Hand in any missing work and/or schedule an appointment to take a missed test or quiz or re-quiz!! Final lab report due next Monday!

  11. C: 14 Dec. 2010 • Objective: SWBAT calculate mass relationships in chemical reactions. • Do now: 2KNO3(s)  2KNO2(s) + O2(g) • How many moles of KNO2 are produced by the reaction of 2 moles of KNO3? • How many moles of oxygen gas are produced by the reaction of 0.50 moles of KNO3?

  12. Agenda • Do now • Review mole relationships • Mass relationships! • Hand back lab reports Homework: Week 15 Homework #1 (PAGE 1-2!) Lab report final draft Monday.

  13. Mass Relationships in Chemical Reactions Work along on your worksheet! SWBAT calculate mass relationships in chemical reactions.

  14. Reviewing Mole Relationships 2KNO3(s)  2KNO2(s) + O2(g) • How many moles of O2 are produced when 2 moles of KNO2 are produced? • How many moles of KNO3 are required to produce 4 moles of KNO2? • How many moles of KNO3 are required to produce 5 moles of O2? • How many moles of O2 are produced by the reaction of 13.5 moles of KNO3? SWBAT calculate mass relationships in chemical reactions.

  15. What if, instead of moles, the problem gives you grams of a reactant or product and asks you to calculate grams of another reactant or product?! SWBAT calculate mass relationships in chemical reactions.

  16. Reaction Stoichiometry Calculating: • The number of moles and grams of reactants that combine • The number of moles and grams of products produced You already know every part of reaction stoichiometry. The trick is putting these skills together into one process. SWBAT calculate mass relationships in chemical reactions.

  17. Part I • First, review moles to moles stoichiometry

  18. 4Al(s) + 3O2(g) → 2Al2O3(s) • PART I: Use the equation above to solve the following problems: STEP 1: Write the given value, with a unit, over one STEP 2: Write a blank conversion factor STEP 3: Put your given unit and substance on the bottom of your conversion factor and the units you want to find on the top of your conversion factor STEP 4: fill in the numbers in your conversion factor using the equation STEP 5: Multiply what’s on top, divide by what’s on bottom. Write your final answer.

  19. PART II: Now let’s say we wanted to know how many grams would be produced/needed rather than how many moles? What could we do to find this? To find grams from moles___________________ • Use your answer from STEP 5 as your new given, put it over 1 • Write a blank conversion factor • Put your given unit and substance on the bottom of your conversion factor and the units you want to find (grams) on the top of your conversion factor • Fill in the numbers using the molar mass of that substance • Multiply what’s on top, divide by what’s on bottom. Write your final answer.

  20. PART III: Now you have converted: MOLES of A  MOLES of B  MASS of B Using: ______________ Using: ______________ But in the lab, we usually need to measure our substances in grams on both ends, so we need to be able to answer questions like: Example 1: How many grams of aluminum are needed to produce 9 grams of aluminum oxide? How could we solve this problem? MASS of A  MOLES of A  MOLES of B  MASS of B Using: _______Using: _________ Using: _________

  21. Just like when doing 2 step conversions in the past, to solve these multi-step problems: • Make a _______________________ • When in doubt on where to start, convert to _______________

  22. A: 14 Dec. 2010 • Take Out Homework: Week 15 • Objective: SWBAT calculate mass relationships in chemical equations. • Do now: 4Al(s) + 3O2(g) → 2Al2O3(s) • How many moles of aluminum oxide will be produced by the reaction of 25 moles of aluminum? • How many grams of aluminum oxide is that?

  23. Agenda • Do now • Mass to mass conversions examples • Practice Problems • Copper Cycle Pre-Lab • Hand back lab reports Homework: Week 15 Homework finish #1, #2 (PAGES 3-4): Thurs. Lab report final draft due Monday Read Lab Handout Procedure, do pre-lab questions and become an expert

  24. 4Al(s) + 3O2(g) → 2Al2O3(s) • Example 1: How many grams of aluminum are needed to produce 9 grams of aluminum oxide? SWBAT calculate mass relationships in chemical equations.

  25. 4Al(s) + 3O2(g) → 2Al2O3(s) • Example 2: How many grams of aluminum oxide can be produced from 13 grams of aluminum? SWBAT calculate mass relationships in chemical equations.

  26. 4Al(s) + 3O2(g) → 2Al2O3(s) • Example 3: How many grams of oxygen gas are needed to react with 11 grams of aluminum? SWBAT calculate mass relationships in chemical equations.

  27. C: Homework • Week 15 Homework #1 (PAGE 1-2) • Lab report final draft: Mon. • If you didn’t get your lab report back, please come talk to me! Come to extra help for…extra help! SWBAT calculate mass relationships in chemical equations.

  28. A: Homework • Week 15 Homework #1 (finish) #2 (PAGE 3-4!!): Thurs • Lab report final draft: Mon. • Read Lab Handout, do pre-lab questions, and become the expert on your section: due tomorrow Come to extra help for…extra help! SWBAT calculate mass relationships in chemical equations.

  29. C: 15 Dec. 2010 • Take Out Homework: Week 15 Homework p. 1-2 • Objective: SWBAT calculate mass relationships in chemical reactions. • Do now: Write and balance the equation: Hydrogen gas reacts with chlorine gas to produce a solution of hydrochloric acid.

  30. Agenda • Do now • Homework solutions • A few more mass to mass calculation problems • Pre-lab discussion of safety • Read procedure and become an expert Homework: Week 15 #2 (PAGES 3-4): Mon. Do pre-lab, including procedure questions: Fri. Final lab report: Mon.

  31. H2(g) + Cl2(g)  2HCl(g) • How many grams of hydrochloric acid are produced when 3.50 grams of hydrogen is reacted with excess chlorine gas? excess: more than enough • How many grams of hydrogen gas are required to produce 5.00 grams of hydrochloric acid? • How many grams of chlorine gas reacts exactly with 4.9 grams of hydrogen gas? SWBAT calculate mass relationships in chemical reactions.

  32. 4Fe(s) + 3O2(g)  2Fe2O3(s) • How many grams of iron (III) oxide are produced by the reaction of 1.00 grams of iron in excess oxygen? • How many grams of oxygen are required to react exactly with 5.00 grams of iron? • How many grams of oxygen are required to produce 3.50 grams of iron(III) oxide? • How many grams of iron (III) oxide are produced by the reaction of 0.50 grams of oxygen with excess iron? SWBAT calculate mass relationships in chemical reactions.

  33. Copper Cycle Lab Cu L8R!

  34. Safety • This lab uses HIGH concentrations of chemicals • Chemicals could burn skin, clothing, and eyes • MUST wear goggles at all times in lab • May take 1minute goggle breaks in the hallway as needed (2 at a time) • If you are not wearing your goggles in the lab, I will ask you to go to the office until you can behave safely.

  35. Chemical burns

  36. Safety • What does “behaving safely” look like? • Examples: • Stay at lab station, don’t wander the room • Be careful with glassware and chemicals • Never squirt anyone or anything with any chemical (INCLUDING WATER) • Notify Ms. Boiteau of any spills/breakage right away – clean thoroughly • MUST behave carefully and safely • If you are not behaving safely, I will ask you to go to the office until you can behave safely.

  37. You are the experts! • Each group member will be an expert on one section of the procedure • This person is responsible for managing that part of the procedure for the group • Understanding what is going on • Being the primary ‘doer’ during that section – measuring chemicals, etc. • Your group is counting on you!

  38. For the rest of the period… • Do the pre-lab questions on the front page. • Read the procedure. • For the section for which you are the expert, complete the questions after those procedure steps. Due tomorrow!!

  39. Homework • Week 15 #2 (PAGES 3-4): Mon. • Do pre-lab, including procedure questions: Fri. • Final lab report: Mon.

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