today
Download
Skip this Video
Download Presentation
Today…

Loading in 2 Seconds...

play fullscreen
1 / 72

Today… - PowerPoint PPT Presentation


  • 119 Views
  • Uploaded on

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:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Today…' - hyacinth-roy


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
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?
slide32
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):
ad