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Chemistry Week 24

Chemistry Week 24. Please get out your Classwork and calculator!. Feb 27th , 2013. AGENDA: 1 – Agenda Bell Ringer 2 – Notes: Mole Conversion: 2 step conversions 3 – Work Time. Today’s Goal: Students will be able to convert between moles, grams and particles. Homework

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Chemistry Week 24

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  1. Chemistry Week 24 Please get out your Classwork and calculator!

  2. Feb 27th, 2013 AGENDA: 1 – Agenda Bell Ringer 2– Notes: Mole Conversion: 2 step conversions 3– Work Time Today’s Goal: Students will be able to convert between moles, grams and particles. Homework • Mole Conversions Wkst2 – due tomorrow! (change to classwork assignment) • Work from Week 23 due by Friday

  3. Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?

  4. 2MINUTES REMAINING…

  5. Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?

  6. 1MINUTES REMAINING…

  7. Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?

  8. 30 seconds Remaining…

  9. Wednesday, February 27 Objective: Students will be able to convert between moles, grams and particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4?

  10. 10 seconds Remaining…

  11. BELL-RINGER TIME IS UP!

  12. Feb 27th, 2013 AGENDA: 1 – Agenda Bell Ringer 2– Notes: Mole Conversion: 2 step conversions 3– Work Time Today’s Goal: Students will be able to convert between moles, grams and particles. Homework • Mole Conversions Wkst2 – due tomorrow! (change to classwork assignment) • Work from Week 23 due by Friday

  13. Wednesday, February 27 Objective: Students will be able to convert from moles to grams and moles to particles. Bell Ringer: How many grams are in 3.75 moles of H2SO4? Molar mass of H2SO4 = 98.1 g/mol. 3.75 moles x 98.1 grams = 1 mole 3.75 x 98.1 g = 367.9 g

  14. Mole Conversions • Topic: Mole Conversions Part 2 • Date: 2/26/2013 • Yesterday  mole to gram conversions • Example: If you have an 8.0 mole sample of NaCl, how many grams do you have? 1. NaCl = Na = Cl = 58.44 g 1 mol 2. 8.0 mole NaClx 58.44 g 1 mol = 467.52 g NaCl • = 22.99 1x • 22.99 = 35.45 1x +______ 35.45

  15. Gram to Mole • What if you were given a 200 gsample of NaCl, and you wanted to convert to moles? Molar Mass of NaCl = 200 g mole  gram gram  mole multiplication division • 58.44 g • 1 mole • 1 mole • 58.44 g • = • x 1 mole= • 58.44 g 200 mole = 58.44 3.42 mol NaCl

  16. Gram to Mole (cont) • Example: • If you have a 150 g sample of AlPO4, how many moles do you have? 1. AlPO4 = Al = P = O = 121 g mol 2. 150 gx 1 mol 121 g = 1.24 mol AlPO4 • = 26 1 x • 26 1 x 31 = 31 • = 64 + 4 x • 16

  17. Mole to Particle Conversion Conversion • YESTERDAY • Imagine if you want to know HOW MANY atoms are in 1.5 moles of silver metal… 1.5 mole • X6.02 x 10231 mole = 9.03 x 1023 atoms

  18. Particle to Mole • What if you were given a 2.00 x 1026 particlessample of NaCl, and you wanted to convert to moles? 2.00x 1026 particles mole  particles particles  mole multiplication division • x 1 mole= • 6.02 x 1023 part 2.00 x 1026 mole 6.02 x 1023 3.32 x 102 mol NaCl

  19. Problem Solving Decision Tree Read the problem If moles and grams If moles and particles Calculate Molar Mass If particles moles If moles  grams If grams moles If moles  particles Multiply by molar mass Divide by molar mass Multiply by 6.02 x 1023 Divide by 6.02 x 1023

  20. Mole to Gram Conversion • Imagine if you want to measure out a 1.5 mole sample of silver metal…? • Could you count out 1.5 moles? • But you can use molar mass to convert moles to grams, and you can measure grams. Molar Mass of Silver = 1.5 mole ... NO! • 107.9 g Ag • 1 mole Ag • x107.9 g= • 1 mole 1.5 x 107.9 g = 161.8 g Ag

  21. Practice Problems • If you had a 7.5 mole sample of H2O, how many grams would you have? • Determine the molar mass. • Convert! (Watch units!) 1. H2O = 2xH = O = 18.0 g 1 mol 2. 7.5 mole H2O x 18.0 g 1 mol = 7.5 x 18.0 g H2O = 135.0 g H2O (2 x 1.0) 16.0 +

  22. Gram to Mole • What if you were given a 200 gsample of NaCl, and you wanted to convert to moles? Molar Mass of NaCl = 200 g mole  gram gram  mole multiplication division • 58.5 g • 1 mole • 1 mole • 58.5 g • = • x 1 mole= • 58.5 g 200 mole = 58.5 3.4 mol NaCl

  23. Particle to Mole • What if you were given a 2.00 x 1026 particlessample of NaCl, and you wanted to convert to moles? 2.00x 1026 particles mole  particles particles  mole multiplication division • x 1 mole= • 6.02 x 1023 part 2.00 x 1026 mole 6.02 x 1023 = 3.32 x 102 mol NaCl

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