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Today…. Get Out: Nothing Our Plan: Airbag Lab (Reading & Initial Measurements) Homework (Write in Planner): Nothing. Today…. Get Out: Goggles, Lab Handout, Bag of Supplies Our Plan: Airbag Lab Quick Reminders:

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Presentation Transcript
Today
Today…

  • Get Out:

    • Nothing

  • Our Plan:

    • Airbag Lab (Reading & Initial Measurements)

  • Homework (Write in Planner):

    • Nothing


Today1
Today…

  • Get Out:

    • Goggles, Lab Handout, Bag of Supplies

  • Our Plan:

    • Airbag Lab

      • Quick Reminders:

        • Come up with a design FIRST (use 2.50 g of baking soda and 29.8 mL of vinegar for each trial).

        • Make sure to time the reaction from beginning to end AND measure the height of your bag for EVERY TRIAL!

        • After you have a design that you like, tinker with the amounts of vinegar and baking soda until you have the perfect combination.

      • You MUST have a design by the end of class!

  • Homework (Write in Planner):

    • Nothing


Today2
Today…

  • Turn in:

    • Nothing

  • Our Plan:

    • Airbag Lab – Packet due TODAY!

    • Must Have:

      • Calculations p. 3 & 4

      • Trial(s) with Speed & Height/Diagram p. 5

      • At least 6 trials changing amount of chemical

    • Final Tests the last 20 minutes

  • Homework (Write in Planner):

    • Enjoy your Weekend


Check this out
Check this out…

  • Oobleck

  • http://www.youtube.com/watch?v=1nX8jvj_jOk


Today3
Today…

  • Turn in:

    • YOU NEED YOUR TEXTBOOK TODAY AND NEXT CLASS!

  • Our Plan:

    • Video Clips

    • Stop the Process Reading & Activities

  • Homework (Write in Planner):

    • Finish AT LEAST the first two pages from the packet (2 & 3).


Here s some of what you ll learn
Here’s some of what you’ll learn…

  • http://www.youtube.com/watch?v=PBF_t8Zt9AU


Page 4 box 1
Page 4, box #1

  • http://vimeo.com/2670546


Today4
Today…

  • Turn in:

    • YOU NEED A TEXTBOOK TODAY!

    • Get out Stop the Process & Clicker

  • Our Plan:

    • Clicker Review

    • Immiscible Love Story

    • Set Up Borax with your table group

    • Finish Stop the Process Reading

    • Quick Review of Saturation

    • Supersaturated Lab

    • Wrap Up – Mix-Pair-Share

  • Homework (Write in Planner):

    • Finish Stop the Process


Quick review grab a clicker
Quick Review – Grab a Clicker

  • In salt water what is the solute, salt or water?

  • In lemonade what is the solvent, water, lemon juice, or sugar?

  • Which kind of Kool Aid has the MOST SOLVENT; very sweet or barely sweet?

  • What do we call a solution that can conduct electricity?


Solution formation animation
Solution Formation Animation

  • http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/molvie1.swf



Steve spangler video stop the process last box
Steve Spangler Video – Stop the Process Last Box

  • http://www.stevespanglerscience.com/experiment/instant-hot-ice





Wrap up mix pair share
Wrap Up – Mix-Pair-Share

  • How can you tell if a solution is saturated, unsaturated, or supersatured?

  • What do you add to a solution to make it supersaturated?

  • What is an example of two things that are immiscible?

  • What does it mean if something is deliquescent?

  • In Jello, what is the solute and what is the solvent?


Today5
Today…

  • Turn in:

    • Stop the Process

  • Our Plan:

    • Review

    • Finish Supersaturated Lab

    • Molarity POGIL

    • Wrap Up – High Five

  • Homework (Write in Planner):

    • Finish POGIL


Review mix pair share
Review– Mix-Pair-Share

  • How can you tell if a solution is saturated, unsaturated, or supersatured?

  • What do you add to a solution to make it supersaturated?

  • What is an example of two things that are immiscible?

  • What does it mean if something is deliquescent?

  • In Jello, what is the solute and what is the solvent?


Wrap up
Wrap Up

As a team, what are 5 things that you learned today?



Today6
Today…

  • Turn in:

    • Get Out Index Card/Sticky Note and number 1 - 8

  • Our Plan:

    • Molarity Quick Review

    • Molarity Quiz

    • Finish POGIL

    • Start Crossword Puzzle, if time

  • Homework (Write in Planner):

    • POGIL, if not finished


Vocab review
Vocab Review

  • Which word from the word wall am I?

    • When you add water to Kool-Aid and make it less concentrated.

    • Two substances that can’t mix, like oil and water.

    • Milk, cheese, fog, mayonnaise

    • If you add a seed crystal and a solution crystallizes.

    • In ocean water, water is the _____.

    • A substance that cannot conduct electricity.


Molarity review
Molarity Review

M = mol/L

  • What is the molarity of a solution with 3.4 grams of HCl in 157 mL? (0.59 M)

  • What volume of solution would be made from 2.1 moles of 3.72 M solution? (0.56 L)


Today7
Today…

  • Turn in:

    • Get out POGIL

  • Our Plan:

    • Finish POGIL

    • Molarity Activity

  • Homework (Write in Planner):

    • POGIL Due next class

    • State Assessment Next Class


Today8
Today…

  • Turn in:

    • Nothing

  • Our Plan:

    • State Assessment

    • Molarity Review Activity

    • Molarity Quiz

  • Homework (Write in Planner):

    • Nothing


Today9
Today…

  • Turn in:

    • POGIL & Grab a Clicker

  • Our Plan:

    • Vocab Crossword Puzzle (25 min)

    • Dilution Notes

    • Rainbow in the Blue Lab

    • Clicker Review

  • Homework (Write in Planner):

    • Finish Lab Questions & Crossword


Review time
Review Time

  • Clicker Review

  • What volume of solution would be made if you have 78.9 g of HCl and want to make a 3.72 M solution?

  • What is the percent by mass of a 25.6 g Kool Aid solution with 3.87 g of Kool Aid powder?


Dilution
Dilution

  • Definition- making a solution less concentrated

  • Equation – M1V1=M2V2

    • where M= molarity & V=volume


Example
Example

  • What volume of concentrated HCl (12.4M)should be used to make 250mL of 4M HCl?


Example1
Example

  • What volume of water should be used ?

  • Making 250mL


Example 2
Example 2

  • 12mL of an unknown concentration of sulfuric acid was used to make a 500mL sample of 0.56M sulfuric acid. What was the concentration of the unknown?


Stop!

  • Complete the example problems in your notebooklet.


Lab time1
LAB TIME!!!

  • Complete the rainbow out of the blue lab


Wrap up1
Wrap Up

  • Clicker Review 2

  • Clicker Review 3


Today10
Today…

  • Turn in:

    • Crossword Puzzle - basket

    • Dilution Lab - basket

  • Our Plan:

    • Clicker Review

    • Daily Challenge

    • Notes

    • Worksheet #2

  • Homework (Write in Planner):

    • Worksheet Due next class


Daily challenge
Daily Challenge

  • In the winter when the streets are going to become icy, what does the city do? Why do they do it?



Molality
Molality

  • Concentration of a solution expressed as moles of solute per kilogram of solvent (m)


Equation
Equation

  • m= moles solute

    mass of solvent (kg)


Example2
Example

  • A solution was prepared by dissolving 17.1g of sucrose in 125g of water . Find the molal concentration of this solution.

  • m= moles solute

    mass of solvent (kg)


Example continued
Examplecontinued…

  • Find moles of solute-

    17.1 g sucrose x 1mole = 0.0500 mole

    342.34 g

  • Find kg solvent –

    125g x 1kg = 0.125kg

    1000g

  • Use equation- 0.0500 mole = 0.400 m

    0.125kg


Try it out
Try It Out

  • Do #1 & #2 on your worksheet


Colligative property
Colligative Property

  • Properties that change when solute particles are added.


Vapor pressure lowering
Vapor Pressure Lowering

  • Vapor Pressure is the pressure caused by molecules that have escaped from the liquid phase to the gaseous phase.

  • It is the tendency of molecules to evaporate.


Vapor pressure lowering1
Vapor Pressure Lowering

  • Liquid molecules at the surface of a liquid can escape to the gas phase when they have enough energy.

  • By adding a solute the amount of surface area for the escaping solvent molecules is less (solute particles take up space).

  • The solvent molecules have a lower probability to evaporate (pressure is lower)


Vapor pressure lowering2
Vapor Pressure Lowering

  • Example – water vs. salt water


Freezing point depression
Freezing Point Depression

  • In order for a liquid to freeze it must form crystals.

  • When a solute is added, it disrupts the solution’s ability to form crystals.


Freezing point depression1
Freezing Point Depression

  • Example – Putting salt on icy sidewalks in the winter


Another example
Another Example

  • Antifreeze in cars

  • Insects & Reptiles– survive freezing temps by producing a form of antifreeze (alcohols and sugars)

  • Species of fish in the Antarctic


Freezing point depression2
Freezing Point Depression

  • The Equation

    Δtf = Kfm

  • Δtf(freezing point depression) is the difference between the freezing points of the pure solvent and a solution

  • Kf is the molal freezing point constant

  • m is the molality


Boiling point elevation
Boiling Point Elevation

  • Because the vapor pressure is lower, it takes a higher temperature to boil a solvent.


Boiling point elevation1
Boiling Point Elevation

  • Adding salt to water when making pasta?

    • NO! Would take 1.3 lb of salt to raise temperature 2 degrees


Boiling point elevation2
Boiling Point Elevation

  • Example – antifreeze in a car’s radiator

    • Serves as a coolant in the summers that keeps it from “boil overs”.


Boiling point elevation3
Boiling Point Elevation

  • The Equation

    Δtb = Kbm

  • Δtb(boiling point elevation) is the difference between the boiling points of the pure solvent and a solution

  • Kb is the molal boiling point constant

  • m is the molality


Colligative sample problem 1
Colligative Sample Problem 1

  • What is the freezing-point depression of water in a solution of 0.0500 mol of sucrose (C12H22O11), and 200 g of water?


Problem 1
Problem 1

Δtf = Kfm

  • Δtf = ?

  • Kf= -1.86 ○C/m(packet)

  • m = mol solute/kg solvent

    = 0.0500 mol/0.2 kg

    = 0.3 m


Problem 11
Problem 1

Δtf = Kfm

X = (-1.86 ○C/m)(0.3 m)

X = -0.6 ○C


Colligative sample problem 2
Colligative Sample Problem 2

  • A water solution containing an unknown quantity of solute is found to have a freezing point of -0.23 ○C. What is the molal concentration of the solution?


Problem 2
Problem 2

Δtf = Kfm

  • Δtf = -0.23○C – 0○C = -0.23○C

  • Kf= -1.86 ○C/m(packet)

  • m = x


Problem 21
Problem 2

Δtf = Kfm

-0.23○C = -1.86○C/m(x)

-0.23○C = x

-1.86○C/m

X = 0.12 m


Colligative sample problem 3
Colligative Sample Problem 3

  • What is the boiling-point elevation of a solution made from 20.0 g of a solute and 400 g of water? The molar mass of the solute is 62.0 g.


Problem 3
Problem 3

Δtb = Kbm

  • Δtb = x

  • Kb= 0.51○C/m(packet)

  • m = moles solute/kg solvent


Problem 31
Problem 3

  • Need to find moles solute:

  • 20.0 g x 1 mole = 0.323 moles

    62 g

  • m = 0.323 moles/0.4 kg

  • m = 0.8


Problem 32
Problem 3

Δtb = Kbm

  • Δtb = x

  • Kb= 0.51○C/m(packet)

  • m = 0.8


Problem 33
Problem 3

Δtb = Kbm

X = (0.51○C/m)(0.8 m)

X = 0.4 ○C


Homework
Homework

  • Complete the Colligative Properties WS for homework!

  • Lets do 6a together


Lab time2
LAB TIME!

  • Complete the Freezing Point Depression Lab.


Wrap up2
Wrap Up

  • Clicker Review


Today11
Today…

  • Turn in:

    • Get WS #2 out to check

  • Our Plan:

    • Quiz, Quiz Trade

    • Molality Quiz

    • Colligative Lab

    • Salting Roads Reading

    • Test Review

  • Homework (Write in Planner):

    • Test Review due next class

    • TEST NEXT CLASS



Wrap up3
Wrap Up

  • Clicker Review #3

  • Clicker Review #4


Today12
Today…

  • Turn in:

    • Get out Test Review to Check

  • Our Plan:

    • Worksheet Race

    • Go over Test Review

    • Unit 10 Test

  • Homework (Write in Planner):


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