# WELCOME BACK!! - PowerPoint PPT Presentation

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## WELCOME BACK!!

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### Title: WELCOME BACK!! Author: Monica Last modified by: Teacher1 Created Date: 1/27/2014 8:35:52 PM Document presentation format: On-screen Show Company – PowerPoint PPT presentation

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Title: WELCOME BACK!!

1
• Warm-Up 5/12/14
• What is the formula for molality?
• What is the molality of 3.68 mol of sucrose
(C12H22O12) in 2.50 kg of water?
• Checking 5 mins after the bell

2
Objective Use freezing point depression and
boiling point elevation formulas Agenda Freezing
Point Depression Boiling Point Elevation
3
• Warm-Up 5/12/14
• What is the formula for molality?
• What is the molality of 3.68 mol of sucrose
(C12H22O12) in 2.50 kg of water?
• Checking 5 mins after the bell

4
Monday Tuesday Wednesday Thursday Friday
12 Finish up new stuff 13 Finish up new stuff 14 Review 15 Review 16 Party?
19 Senior Finals 20 Senior Finals 21 Senior Finals 22 23 Finals
26 Memorial Day no school 27 Finals 28 Finals 29 Finals 30 Field Day
5
What happened? ?Tf Kfcm
?Tf is change in freezing point
Kf is freezing-point depression constant
Cm is concentration in molal.
6
Same effect on boiling point ?Tb Kbcm
?Tb is change in boiling point
Kb is boiling-point elevation constant
Cm is concentration in molal.
7
If you use 3.68 mol of sucrose and dissolve this
into 2.50kg of water, what will be the change in
the freezing point of your solution. Assume the
Kf of water is -1.86oC/m.
8
Homework Finish worksheet Tutoring Today 4th
Rm. 401 5th Rm. 402