1 / 165

C: 4 January 2012

C: 4 January 2012. Grab a calculator and find your new seat. Objective : You will be able to: convert between number of atoms/molecules, moles and mass of any element or compound. Do now : Search in your notes: a. What is a mole? b . How many atoms/molecules are in a mole?. Agenda.

afram
Download Presentation

C: 4 January 2012

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. C: 4 January 2012 • Grab a calculator and find your new seat. • Objective: You will be able to: • convert between number of atoms/molecules, moles and mass of any element or compound. • Do now: Search in your notes: • a. What is a mole? • b. How many atoms/molecules are in a mole?

  2. Agenda • Do now • Review: The Mole • Mole to atoms/molecules conversions • Practice Problems • Mole to mass conversions • Practice Problems Homework: Week 17 Homework page 1-2: tomorrow Hey, did I get your lab report?!

  3. Calculators • You’re going to need a calculator to complete homework for the rest of the year. • Come work in here Tues. and Thurs. • Buy a $10 scientific calculator • must have scientific notation • Use your cell phone (at home).

  4. The Mole • Atoms are so tiny; how do we quantify their masses? • The mole: a unit for amount of substance • In groups of 6.02 x 1023 atoms or molecules • 6.02 x 1023 atoms/molecules = 1 mole • 6.02 x 1023 atoms/molecules = Avogadro’s Number

  5. Big Questions • http://www.youtube.com/watch?v=s0zxF66nbRU • If you react 5.0 grams of oxygen with 5.0 grams of hydrogen, what will you produce? • How many grams will be produced? • Will there be oxygen or hydrogen left over? • If so, how much?

  6. Convert Between Moles and Number of Atoms/Molecules Same two fractions for ANY element or compound!!

  7. Example 1 • How many atoms of silver are in 5.00 moles of silver?

  8. Example 2 • How many molecules of water are in 3.5 moles of water?

  9. Example 3 • How many moles of sodium are equal to 1.50x1024 atoms of sodium?

  10. Example 4 • How many moles of water are equal to 5,000.0 molecules of water?

  11. Practice Problems • Convert 3.01 x 1023 atoms of silver to moles. • Convert 2500 molecules of water to moles. • How many atoms of carbon are in 3.2 moles of carbon? • How many atoms of beryllium are in 2.1x1014 moles of beryllium?

  12. Homework • Week 17 Homework page 1 • and…did I get your lab report?!

  13. Atoms to Moles • How many atoms of sodium are in 0.5 moles of sodium? • How many atoms of oxygen are in 1.5 moles of oxygen? • How many atoms of fluorine are in 0.075 moles of fluorine? • How many atoms of argon are in 3.45 moles of argon?

  14. C: 5 January 2012 • Take Out Homework: Week 17 p. 1 • Objective: You will be able to: • convert between mass and number of moles of a sample of any element or compound. • Do now: How many moles are equal to 2,300,000 molecules of methane? Show your work!

  15. Agenda • Do now • Homework answers • Review converting between moles and number of atoms/molecules • Converting between moles and mass of elements and compounds • Practice Problems • Ticket • Moles Conversions Stations Homework: Week 17 Homework page 2: Fri. Quiz Monday on atom/molecule, mole, mass conversions

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

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

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

  19. Practice Problems • 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?

  20. What if you’re working with a compound, not an element? • Mass = molar mass! • Review: Calculate the molar mass of water.

  21. Example 1 • Calculate the mass of 3.0 moles of water.

  22. Example 2 • Calculate the number of moles equal to 0.50 grams of carbon dioxide.

  23. Converting Between Moles and Mass • Calculate the mass of 5.00 moles of methane. • Calculate the number of moles equal to 5.00 grams of boron trifluoride. • Calculate the mass of 0.50 moles of ammonia (NH3). • Calculate the number of moles equal to 1,000. grams of water.

  24. Objective Ticket • Start your homework if you finish early.

  25. Homework • Week 17 Homework page 2: Fri. • Quiz Mon. on atom/molecule, mole, mass conversions

  26. C: 6 January 2011 • Grab a calculator • Take Out Homework: Week 17 p. 2 • Objective: You will be able to: • convert between number of atoms/molecules, moles and mass of a sample of any element or compound. • Do now: Calculate the mass of 5.00 moles of magnesium chloride (MgCl2).

  27. Agenda • Do now • Check homework • Finish conversion stations Homework: Week 17 page 3-4: Mon. Quiz Monday on atom/molecule, mole, mass conversions

  28. 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 • Always show all your work! • A correct answer = a number + units + element/compound

  29. 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.

  30. C: Homework • Week 17 Homework p. 3-4: Mon. • Quiz Mon. on atoms/molecules, moles, mass conversions

  31. C: Homework • Week 17 Homework p. 2: tomorrow

  32. C: 9 January 2012 • Grab a calculator and your green folder • Take Out Homework: Week 17 p. 3-4 • Objective: You will be able to: • convert between atoms/molecules, moles and mass of any element or compound. • Do now: How many atoms are there in 1.00 gram of zinc? (Do this in two steps.)

  33. Agenda • Do now • Homework answers • Questions • Quiz on 4.1 and 4.2 • Hand back work/progress reports/clean out folders • Demo: chemical change Homework: None!

  34. Quiz • When you finish, raise your hand. • Track your last Unit 3 Quiz • Clean all Unit 3 materials out of your folder and paperclip them together, with your tracking sheet on top. • Leave this pile on your desk for stamps. • Then, after the quiz, put it in your green folder.

  35. 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.

  36. 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

  37. 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.**

  38. Chemical Reactions

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

  40. 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

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

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

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

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

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

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

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

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

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

  50. 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)

More Related