Today… Get Out: Nothing Our Plan: Airbag Lab (Reading & Initial Measurements) Homework...

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: 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

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…

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

nX8jvj_jOk

Today… Turn in:

YOU NEED YOUR TEXTBOOK TODAY AND NEXT CLASS!

Our Plan:Video ClipsStop 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…

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

Page 4, box #1

http://vimeo.com/2670546

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 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

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

Immiscible Love Story

Steve Spangler Video – Stop the Process Last Box

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

Saturated vs. Unsaturated

Video Clip of Supersaturation – Hot Ice

Lab Time!

Wrap Up – Mix-Pair-Share

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

2. What do you add to a solution to make it supersaturated?

3. What is an example of two things that are immiscible?

4. What does it mean if something is deliquescent?

5. In Jello, what is the solute and what is the solvent?

Today… Turn in:

Stop the Process Our Plan:

ReviewFinish Supersaturated LabMolarity POGILWrap Up – High Five

Homework (Write in Planner):Finish POGIL

Review– Mix-Pair-Share

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

2. What do you add to a solution to make it supersaturated?

3. What is an example of two things that are immiscible?

4. What does it mean if something is deliquescent?

5. In Jello, what is the solute and what is the solvent?

Wrap Up

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

Saturated vs. Unsaturated

Today… Turn in:

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

Our Plan:Molarity Quick ReviewMolarity QuizFinish POGILStart Crossword Puzzle, if time

Homework (Write in Planner):POGIL, if not finished

Vocab Review

Which word from the word wall am I?1. When you add water to Kool-Aid and make it

less concentrated.2. Two substances that can’t mix, like oil and

water.3. Milk, cheese, fog, mayonnaise4. If you add a seed crystal and a solution

crystallizes.5. In ocean water, water is the _____.6. A substance that cannot conduct electricity.

Molarity Review

M = mol/L

7.What is the molarity of a solution with 3.4 grams of HCl in 157 mL? (0.59 M)8.What volume of solution would be made from 2.1 moles of 3.72 M solution? (0.56 L)

Today… Turn in:

Get out POGIL Our Plan:

Finish POGILMolarity Activity

Homework (Write in Planner):POGIL Due next classState Assessment Next Class

Today… Turn in:

Nothing Our Plan:

State AssessmentMolarity Review ActivityMolarity Quiz

Homework (Write in Planner):Nothing

Today… Turn in:

POGIL & Grab a Clicker Our Plan:

Vocab Crossword Puzzle (25 min)Dilution NotesRainbow in the Blue LabClicker Review

Homework (Write in Planner):Finish Lab Questions & Crossword

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

Definition- making a solution less concentrated

Equation – M1V1=M2V2

where M= molarity & V=volume

Example

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

Example

What volume of water should be used ?

Making 250mL

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 TIME!!!

Complete the rainbow out of the blue lab

Wrap Up

Clicker Review 2 Clicker Review 3

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

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

Colligative Properties

Molality

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

Equation

m= moles solute mass of solvent (kg)

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 …

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

Do #1 & #2 on your worksheet

Colligative Property

Properties that change when solute particles are added.

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 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 LoweringExample – water vs. salt water

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 Depression

Example – Putting salt on icy sidewalks in the winter

Another Example

Antifreeze in carsInsects & Reptiles– survive

freezing temps by producing a form of antifreeze (alcohols and sugars)

Species of fish in the Antarctic

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

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

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 Elevation

Example – antifreeze in a car’s radiatorServes as a coolant in the summers that keeps it from “boil overs”.

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

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

Δtf = Kfm

Δtf = ?Kf = -1.86 ○C/m (packet)m = mol solute/kg solvent

= 0.0500 mol/0.2 kg

= 0.3 m

Problem 1

Δtf = Kfm

X = (-1.86 ○C/m)(0.3 m)

X = -0.6 ○C

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

Δtf = Kfm

Δtf = -0.23○C – 0○C = -0.23○C

Kf = -1.86 ○C/m (packet)m = x

Problem 2Δtf = 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

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

Δtb = Kbm

Δtb = x

Kb = 0.51○C/m (packet)m = moles solute/kg solvent

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 3

Δtb = Kbm

Δtb = x

Kb = 0.51○C/m (packet)m = 0.8

Problem 3

Δtb = Kbm

X = (0.51○C/m)(0.8 m)

X = 0.4 ○C

Homework

Complete the Colligative Properties WS for homework!

Lets do 6a together

LAB TIME!

Complete the Freezing Point Depression Lab.

Wrap Up Clicker Review

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

Review Answers

V1 V2 V3 V4#1 15.3 m 7.35 m 250.0 m 24.4 m

#2 -0.033 °C -0.925 °C -0.895 °C -1.66 °C

Wrap Up

Clicker Review #3 Clicker Review #4

Today… Turn in:

Get out Test Review to Check Our Plan:

Worksheet Race Go over Test Review Unit 10 Test

Homework (Write in Planner):