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C: 2 Nov. 2010

C: 2 Nov. 2010. Objective : SWBAT show what you know about the language of chemistry on a test, and convert between atoms/molecules and moles of an element. Do now : What type of question are you most confident about? What type of question are you least confident about?. C: Agenda. Do now

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C: 2 Nov. 2010

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  1. C: 2 Nov. 2010 • Objective: SWBAT show what you know about the language of chemistry on a test, and convert between atoms/molecules and moles of an element. • Do now: What type of question are you most confident about? • What type of question are you least confident about?

  2. C: Agenda • Do now • Test! Language of Chemistry • The Mole – notes • Converting between moles and number of atoms and moles and mass • Practice Problems Homework: Week 9 Homework: #1-26: Weds. Bring your calculator EVERY day!!  Calculator check = 10 point quiz tomorrow!

  3. A: 2 November 2010 • Take Out Homework: Week 8 Test Review • Objective: SWBAT show what you know about the language of chemistry on a test. • Do now (in your notebook): What type of question are you most confident about? • What type of question are you least confident about?

  4. A: Agenda • Do now • Test! Language of Chemistry Homework: Bring a calculator EVERY day! Calculator check = 10 point quiz tomorrow!

  5. Test • The periodic table is on the last page. • You can rip it off if you’d like. • When you are finished, turn your test over on your desk. • Work on something silently • Missed work for chem, work for another class, read a book, etc… • Remain silent, even if you are finished!

  6. A: 3 Nov. 2010 • Take out your calculator! • Objective: SWBAT convert between atoms/molecules and moles and mass of an element. • Do now: (In your notebook) We buy eggs by the dozen, and shoes by the pair. Name at least two other things that you buy in multiples (that is, more than one at a time).

  7. Agenda • Do now, calculator check • Notes on the Mole, converting between moles and number of atoms/particles • Practice Problems • Converting between moles and mass of elements • Practice Problems Homework: Week 9 Homework #1-34 odds: Thurs.

  8. Announcement • I’m going to underline the things you should write down. • If it’s not underlined, don’t write it down.

  9. New Unit: Stoichiometry • The calculation of the amounts of matter used in a chemical reaction and produced by a chemical reaction. • H2(g) + O2(g)  H2O(g) • If 5 grams of hydrogen is reacted with 5 grams of oxygen, how many grams of water will be formed? Will any hydrogen or oxygen be left over? How much?

  10. The Mole • Atoms are so tiny; how do we quantify their masses? • We communicate the mass of atoms in terms of really, really huge groups of atoms. • 6.02x1023 atoms, to be exact!

  11. The Mole • Mole: The scientific unit for amount of substance • =6.02x1023 atoms or molecules • =Avogadro’s Number

  12. How big is a mole? • Enough soft drink cans to cover the surface of the earth to a depth of over 200 miles. • If you had Avogadro's number of unpopped popcorn kernels, and spread them across the United States of America, the country would be covered in popcorn to a depth of over 9 miles. • If we were able to count atoms at the rate of 10 million per second, it would take about 2 billion years to count the atoms in one mole.

  13. Really? How big? • 1 mole of pennies could be distributed to all the currently-living people of the world so that they could spend a million dollars per hour every hour (day and night) for the rest of their lives. • 1 mole of blood cells would be more than the total number of blood cells found in every human on earth.

  14. Amadeo Avogadro • Italian • Born: 1776 • Studied physics and math • Taught high school, then college

  15. Converting between moles and atoms/molecules • Two possible conversion fractions Same two fractions for ANY element or compound!!

  16. Example 1 • How many moles are equal to 3.50x1023 atoms of silver?

  17. Example 2 • How many moles are equal to 1.25x1024 molecules of sodium bromide?

  18. Example 3 • How many atoms are there in 1.50 moles of sulfur?

  19. Example 4 • How many molecules are there in 10.55 moles of water?

  20. How many moles of silver are equal to 3.01 x 1023 atoms of silver? • How many moles of water are equal to 2500 molecules of water? • How many atoms of carbon are in 3.2 moles of carbon? • How many molecules of calcium chloride are in 1.0 mole of calcium chloride?

  21. C: 8 November 2010 • Take Out Homework: Week 9 #1-18 and your calculator! • Objective: SWBAT convert between atoms, moles and mass of elements. • Do now: Choose and write the correct fraction to convert if… • a. The problem gives you atoms and asks for moles. • b. The problem gives you moles and asks for atoms.

  22. Agenda • Do now, calculator check • Homework answers • Convert between moles and mass of elements • Convert between atoms, moles, and mass of elements Homework: Week 9 Homework #19-34: Weds.

  23. Converting between moles and mass of elements • Two possible conversion fractions:

  24. Example 1 • Calculate the mass in grams of 3.50 moles of hydrogen.

  25. Example 2 • Calculate the number of moles equal to 10.0 grams of silicon.

  26. What is the mass in grams of 3.50 mol of copper? • What is the mass in grams of 2.25 mol of iron? • How many moles of aluminum are equal to 11.9 grams of Aluminum? • How many moles of calcium are equal to 5.00 grams of calcium?

  27. A: 4 Nov. 2010 • Take Out Homework: Week 9 Homework #1-26 odds • Objective: SWBAT convert from mass to moles to atoms and calculate molar mass. • Do now: • Calculate the number of moles equal to 5.00x1025 atoms of gold. • Calculate the mass of 5.00 moles of gold.

  28. Agenda • Do now • Homework check • Mass to moles to atoms examples and problems • Calculating molar mass examples and problems Homework: Week 9 Homework #27-38: Mon.

  29. Mass to moles to atoms • Ex 1: Calculate the mass of 8.00x1023 atoms of gold. • Ex 2: Calculate the number of atoms in 5.00 grams of bromine.

  30. Calculate the mass of 3.01x1025 atoms of copper. • Calculate the number of atoms in 10.0 grams of lithium. • Calculate the mass of 5000. atoms of zinc. • Calculate the number of atoms in 1.000 grams of beryllium.

  31. C: Homework • Week 9 Homework #19-34: Weds. • Bring calculator every day!

  32. A: 8 Nov. 2010 • Take Out Homework: Week 9 #27-34 • Objective: SWBAT convert between mass, moles and number of atoms of an element • Do now: (In your notebook) Calculate the mass of 500. atoms of cobalt.

  33. Agenda • Do now • Homework check • Using the electronic balance • Mass to moles to atoms stations Homework: Fix Week 9 #1-34 Hand in missing work!

  34. Using an electronic balance • Press “on” • If the display does not read “0.00,” press “zero.” • Gently place the item to be massed on the metal plate. • Record the mass with TWO decimal places (ex: 4.50 g).

  35. Using an electronic balance • Treat these balances with extreme care! • They cost about $250 each. • Never place anything directly on the metal plate, including your fingers! • Press buttons gently. • Never push or pull on any part of the balance. • If a problem occurs, let me know immediately.

  36. Mass to moles to atoms lab • On the front: • Find the mass of the sample. Subtract the mass of the container (given on the card). • Convert to moles • Convert to number of atoms

  37. On the back: • Copy down the number of atoms (from the card) • Convert to moles • Convert to mass • Check your answer by massing the sample on the balance.

  38. Homework • Week 9 Homework: Check #1-34 • Mass, moles, atoms lab: Finish, check for units and element symbols • Due tomorrow • Late work due by 3:15 today!!

  39. Do your best! • Work carefully and quickly!! • Low grades result from sloppy work, not showing work, not writing down units and wasting time during labs. • This is a 1st quarter grade! • 5 min. per station.

  40. Homework • Check and fix Week 9 Homework #1-34

  41. C: Homework • Week 9 Homework #19-34

  42. How do you convert between moles and mass of a compound?!

  43. Calculating Molar Mass • The mass of one mole of a compound. • Units: g/mol • Example 1: NaCl • Example 2: CO2 • Example 3: C8H10N4O2 (caffeine!)

  44. Calculate the molar mass… • lithium bromide • aluminum carbonate • acetic acid (CH3COOH, the acid in vinegar)

  45. A: Homework • Week 9 Homework #27-34: Mon. • Bring your calculator every day!

  46. Converting between moles and mass of compounds • Example 1 • Calculate the mass of 4.52 moles of lithium bromide.

  47. Example 2 • Calculate the number of moles equal to 1.00 grams of aluminum carbonate.

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