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Chemistry Week 24 Please get out your Notebook and calculator!

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Presentation on theme: "Chemistry Week 24 Please get out your Notebook and calculator!"— Presentation transcript:

1 Chemistry Week 24 Please get out your Notebook and calculator!

2 Feb 26th, 2013 AGENDA: 1 – Bell Ringer 3 – Notes: Mole Conversion: Mole to Gram and Mole to Particle 5 – Work Time Today’s Goal: Students will be able to convert from moles to grams and moles to particles. Homework 1. Mole Conversions Wkst 1 – due tomorrow! (change to classwork assignment) 2. Work from Week 23 due by Friday

3 Tuesday, February 26 Objective: Students will be able to earn 80% mastery on their Unit 5 Quiz #2. Bell Ringer: One dozen cupcakes have a mass of 13.5 grams. What is the mass of 2.5 dozen cupcakes?

4 2 MINUTES REMAINING…

5 Tuesday, February 26 Objective: Students will be able to earn 80% mastery on their Unit 5 Quiz #2. Bell Ringer: One dozen cupcakes have a mass of 13.5 grams. What is the mass of 2.5 dozen cupcakes?

6 1 MINUTES REMAINING…

7 Tuesday, February 26 Objective: Students will be able to earn 80% mastery on their Unit 5 Quiz #2. Bell Ringer: One dozen cupcakes have a mass of 13.5 grams. What is the mass of 2.5 dozen cupcakes?

8 30 seconds Remaining…

9 Tuesday, February 26 Objective: Students will be able to earn 80% mastery on their Unit 5 Quiz #2. Bell Ringer: One dozen cupcakes have a mass of 13.5 grams. What is the mass of 2.5 dozen cupcakes?

10 10 seconds Remaining…

11 BELL- RINGER TIME IS UP!

12 Feb 26th, 2013 AGENDA: 1 – Bell Ringer 3 – Notes: Mole Conversion: Mole to Gram and Mole to Particle 5 – Work Time Today’s Goal: Students will be able to convert from moles to grams and moles to particles. Homework 1. Mole Conversions Wkst 1 – due tomorrow! (change to classwork assignment) 2. Work from Week 23 due by Friday

13 Tuesday, February 26 Objective: Students will be able to earn 80% mastery on their Unit 5 Quiz #2. Bell Ringer: One dozen cupcakes have a mass of 13.5 grams. What is the mass of 2.5 dozen cupcakes? 2.5 dozen x 13.5 grams = 1 dozen 2.5 x 13.5 g = 33.75 g

14 Mole Conversion  Obj: SWBAT convert between moles, grams and particles – Part 1  Date: 2/26/2013  Remember:  1 mole (mol) always = 6.02 x 10 23 particles  1 mole = molar mass of ANY substance  SO…. 6.02 x 10 23 particles = molar mass of ANY substance

15 Mole Conversion Ratios  The information for 1 mole can be used to create MOLAR RATIOS  1moleor molar mass of substance Molar mass1 mole  1 mole or 6.02 x 10 23 particles/atoms/molecules 6.02 x 10 23 1 mole

16 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 107.9 g Ag 1 mole Ag... NO! x 107.9 g = 1 mole 1.5 x 107.9 g = 161.8 g Ag

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

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

19 Mole to Particle Conversion Conversion  Imagine if you want to know HOW MANY atoms are in 1.5 moles of silver metal…?  Could you count out those particles?  But you can use 6.02 x 10 23 to convert moles to atoms.  NOTE: you DO NOT need molar mass when converting to particles/atoms/molecules 1.5 mole... NO! X 6.02 x 10 23 1 mole = 9.03 x 10 23 atoms

20  What if you were given a 2.00 x 10 26 particles sample of NaCl, and you wanted to convert to moles? 2.00x 10 26 particles Particle to Mole x 1 mole = 6.02 x 10 23 part 2.00 x 10 26 mole 6.02 x 10 23 3.32 x 10 2 mol NaCl mole  particles multiplication particles  mole division

21 Problem Solving Decision Tree Read the problem If moles and grams Calculate Molar Mass If moles  grams If moles and particles Multiply by molar mass If grams  moles Divide by molar mass If moles  particles Multiply by 6.02 x 10 23 If particles  moles Divide by 6.02 x 10 23

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