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Chapter 4 Section 3

Chapter 4 Section 3 . How much gas is produced?. Date: HW: CTG p. 285 # 3 -8. Do Now: WDYS, WDYT p. 274 Agenda: WDYS, WDYT Investigate: part A. Stoichiometry ( def ). The study of the relationships or ratios between two or more substances undergoing a physical or chemical change.

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Chapter 4 Section 3

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  1. Chapter 4 Section 3 How much gas is produced?

  2. Date:HW: CTG p. 285 # 3-8 Do Now: WDYS, WDYT p. 274 Agenda: WDYS, WDYT Investigate: part A

  3. Stoichiometry (def) • The study of the relationships or ratios between two or more substances undergoing a physical or chemical change

  4. Investigate, Part A • Grab a bag of pennies from the teacher—do no open the bag of pennies! • You will also get a penny—don’t lose this. • The scales are around the room. Answerquestions 1 a-c

  5. Do Now I give you a bag of M&M’s. Knowing what you know in class, you weigh the bag with the M&M’s and it comes out to be about 350g. You then weigh one M&M and it comes out to be 0.75g. You then eat the M&M’s and you find that the bag itself weights about 1.3g. • How many M&M’s were there?

  6. Investigate Part A • For number 2a, find the rule

  7. Investigate Part A • For number 3, read through the paragraphs and answer letter a • Once completed, complete number 4 • Read through number 5.

  8. 4/16/12 Warm Up I have a bag of peanuts that weighs 70000g. If I weigh one peanut and it is 0.6g, how many peanuts do I have? (The bag weighs 25g)

  9. Recap of Investigation

  10. What are some examples… • Write out a domino for the following conversions: • 1 day = 24 hours • 1 hour = 60 minutes • 1 g of water = 1mL of water (remember to include units!)

  11. The mole… • The mass of one atom is too small to measure • So we use one mole of atoms to make a calculation • 1 atom of H = 1 amu • 1 mole of H = 1 g

  12. Investigation • Answer 7 a-d knowing what we just went through. • When finished, make DOMINOES for each of them.

  13. Investigate Part A • When you have a molecule, you must find all the individual components…. H2O • 2 atoms of Hydrogen • 1 atom of Oxygen

  14. Investigate, Part A • Complete number 8 on p. 276 (you have 5 minutes)

  15. Investigate, Part A • When you have a molecule, you must add up all the individual components to find the mass: H2O = 18 amus • 2 atoms of Hydrogen (1 amu each, so 2 amus) • 1 atom of Oxygen (16 amu each, so 16 amu)

  16. Investigate, Part A • Complete number 9 on p. 276

  17. 4/17/12 Warm Up For the next few problems, use CaCO3 • How much of each individual atom is present in the molecule? • How much does one mole of this compound weigh?

  18. Investigation, Part A • Do number 10 a-c on p. 276. • Use the example of water to help you!

  19. Investigate, Part A 11 a:

  20. Investigate, Part A Complete 11 b-d (looks similar to what you see) Only use the dominoes from the previous problem!

  21. Investigate, Part B • Read aloud number 1 2AgNO3 + CaCl2 2AgCl + Ca(NO3)2

  22. Investigate, Part B • Read aloud number 1 2AgNO3 + CaCl2 2AgCl + Ca(NO3)2 If I have 5 moles CaCl2 How many moles of AgCl do I have? If I have 5 moles AgNO3 How many moles Ca(NO3)2 do I have?

  23. Investigate, Part B • You have 5 minutes to answer 1 a-d • Remember, make dominoes like the one on the last slide!

  24. 3/18/12 Warm Up If I have 3 moles of NaNO3, how many grams are present? If I have 38g of NaNO3, how many moles are present?

  25. Use the following equation to solve the problem: Ba(NO3)2 + 2AgCl  BaCl2 + 2AgNO3 If I have 3 moles of Ba(NO3)2, How many moles of AgNO3 are produced?

  26. 4/23/12 Warm Up For the next few problems, use the equation below: 2KClO3 2KCl + 3O2 If I react 4 moles of KClO3, how many moles of KCl will I get as a product? How many moles of O2 will I then get?

  27. Investigate, Part C • Read aloud number 1 on p. 277 • You can use dominoes to calculate the amount of gas!

  28. Examples • 1a: How many liters will 4 moles of hydrogen gas occupy? • 1b: If an oxygen balloon fills 11.2L, how many moles of O2 are in it? • Complete 1c on your own!

  29. Investigate, Part C • Read aloud and complete number 3 together.

  30. 1) Simple One-Step Problems: If I have 7 g of H2O, how many moles do I have?

  31. 1) Simple One-Step Problems: If I have 7 moles of CaCO3, how many grams do I have?

  32. 1) Simple One-Step Problems: If I have 7 moles of H2O (g), how many Liters do I have?

  33. 2) (more) Complex Multistep Problems In the following reaction: 2H2 + O22 H2O 1) If I start out with 8 g of H2, how many moles of H2O do I end up with? 2) How many g of H2O

  34. 2) (more) Complex Multistep Problems In the following reaction: 2 Na (s) + Cl2(g) 2 NaCl (s) 1) If I start out with 8 g of Na, how many moles of Cl2 do I end up with? 2) How many g of NaCl?

  35. Summary • Essential Questions, p. 283 --How do you know? --Why do you believe --Why should you care

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