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## Q2: week 1 – 11/13 – 11/17

” The first day of class should connect to the last day and every day in between!”

Please check Power School for accuracy!

Everyone needs to join Remind for class.  Click me to sign up.

I WILL NOT ACCEPT HOMEWORK AFTER 5:00 am the following day.  IF THERE IS A Problem YOU NEED TO EMAIL ME. IF YOU DO NOT and you do not complete your homework on time YOU WILL EARN A ZERO!

LABs 1 – 8 are LATE!! All Late work for quarter 1 is due by tomorrow morning!

Main focus:

a) To identify the differences in the cooling behavior of 4 different liquids.
b) To identify the liquid that evaporates the fastest.
c) To identify the liquid that has the weakest and strongest IMF’s.
d) To identify the liquid with the lowest and highest boiling point.

Period  6:

1.  Continue with the same Lab as Last Thurday.  We did one liquid.

Lab 9  –  Evaporation of Liquids

2. Review the data and complete the chart in the data section.

11/13 –  Monday  “A” Day Homework:

1.  No homework tonight.

___________________________________________________________                                            Jump toTuesday Homework / top       11/14 – Tuesday “B” Day LAB

Main focus:

1. To Define vapor pressure, boiling, and normal boiling

2. To identify the variables the affect boiling.
3. To utilize table H to solve vapor pressure questions
4. To Identify the relationship with Vapor Pressure, Boiling points and Intermolecular
attractions.

Period  6:

A) Complete lab 9 by analyzing data – print graphs
– determine which liquids have the greatest IMF’s, Boiling Points, and heat of vaporization

B) Vapor pressure lesson – tie Lab 9 to vapor pressure concepts
Vapor Pressure – Force due to colliding gas molecules upwards from a liquid due to evaporation
The higher the rate of evaporation the higher the vapor pressure.

2 factors that drive Vapor Pressure :

1) Temperature – If you increase the temperature the vapor pressure increases.  This makes sense! If you add more heat to a liquid it average kinetic energy increases and it will evaporate more.  Remember heat of vaporization?
2220 J/g :  More energy = More grams of water vaporized

2) Intermolecular attractactions (IMF’s) –  These are forces that keep molecules together in a solid or a liquid. If the IMF’s are greater than another liquid at the same temperature, the liquid with weaker IMF’s will be able to separate from each other and evaporate more readily thus producing more vapor pressure.

Boiling – is a phase change that represents a liquids maximum evaporation or vapor pressure.

The liquid’s boiling point represents when the liquids vapor pressure is maximum!  This maximum is attained when the vapor pressure of the liquid equals the opposing force of the pressure molecules of gas in the atmosphere (atmospheric pressure).

2 factors that drives Boiling Point :

1) Atmospheric Pressure – If the force of gas particles already in the air above are colliding at the surface of the liquid then how easily a gas particle can escape the liquid phase depends on how much these particle are colliding on the liquid.  Lower the atmospheric pressure and the boiling point will decrease. You will need less energy to escape if there is less force on top of you.

2) Intermolecular forces (IMF’s) – If a liquid evaporates very easy like butane (baggie demo Friday) then it does so because the temperature is low OR the IMF’s are very weak.  If the IMF’s are weak then the liquid does not need a lot of heat (lower temperature) to overcome the force of collisions due to the atmospheric pressure.

Period  7:

1.  Continue Vapor pressure lesson –

We will be studying  intensive properties of liquids called vapor pressure.

a) boiling is relative – boiling is not based on temperature – baggie demo

– Intermolecular forces is a factor in boiling

LIquid Smear Demo

atmospheric pressure is a factor in boiling- how do we know that is exists?

Vacuum demos:

a) vapor pressure in a Can with liquid nitrogen

b) Boil water at room temperature.

2. Complete the classwork:

vapor pressure ditto 1 and 2 combined.pdf

vapor pressure Key combined.pdf

Today’s Lesson:

Vapor pressure of liquids Demo – The Smear Races:

Vapor pressure in a Paint Can – Liquid Nitrogen Demo:

11/14 –  Tuesday  “B” Day Homework:

1. Please complete the form below based on the embedded video demos.  I did the first demo in class.
You have a total of three submissions.

1: Smear Demo Quiz Form:

Main focus:

a)  To review the concepts of vapor pressure, IMF’s, and boiling point.
b) To identify the new boiling point if pressure changes in Table H.
c) To identify where liquid nitrogen would fit in table H.

Period  7:

open:  Fog Demo – Boilng water and liquid nitrogen demo – Can we see steam?

Table S:  Can we determine the phase of nitrogen at STP?

1. Vapor pressure definitions on second side of the classwork given out yesterday.

vapor pressure ditto 1 and 2 combined.pdf

vapor pressure Key combined.pdf

2.  Vapor pressure is factor of Temperature and Atmospheric Pressure

– Vacuum chamber water boiling demonstration.

3.  Smear video with Blank Table H.

4. Table H questions from classwork worksheet – complete!!!.

vapor pressure animation:

vapor pressure animation:

Vaporization Presentation:

Today’s Lesson:

Boiling depend on pressure- Room Temperature water Boiling Demo:

11/15 –  Wednesday  “A” Day Homework:

1.  Please complete the Vapor pressure Form 2 below based on the principles of Vapor Pressure, IMF’s , heat vaporization, and boiling points.

1: Vapor Pressure Form 2:

_________________________________________________________                                                 Jump to / top           11/16 – Thursday – B Day – Lab

Main focus:

1. To identify the location of the vapor pressure curve on Table H and compare its IMF, boiling point, and heat of vaporization to liquids currently on the table.

2. To measure the heat of vaporization of Liquid nitrogen

3. To introduce the Gas Laws.

Period  6:

cold open: boiling cold in a baggie demo

1. Review of table H questions from homework form.
a) complete worksheet:

vapor pressure ditto 1 and 2 combined.pdf

vapor pressure Key combined.pdf

b) Where does Liquid Nitrogen Fit on this Curve?

2.   Proof of atmospheric pressure demo – square

3.  Gas Law Begin –  The balloon and liquid nitrogen demo

gas law regents level dittos 0910.pdf

gas law regents level dittos 0910 key.pdf

Period  7:

1.  Lab 10 – Heat of vaporization Lab

Lab 10 – Heat of Vaporization of Liquid Nitrogen.pdf

Boiling Cold Demo – Butane in a Baggie:

Liquid Nitrogen notes:

N2(l) facts:     boiling point/condensation point =  -196ºC, 77 K, – 320 F

heat of vaporization =  199 J/g

Red line = nitrogen,  Blue line = oxygen.

Charles Law Demo: Temperature decreases the Volume decreases – (direct proportion)

Todays Lesson:

11/16 –  Thursday – “B” Day homework: –

1. Please complete selected questions from gas law worksheet handed out today.

Main focus:

1.  To Calculate a new volume, temperature, or pressure using the combined gas law formula.
2.  To identify how Pressure, Temperature, and Volume affects a gas.

Period  7:

1.  Continue with our classwork gas law packet.  Page 1 – Boyles/Charles Law.

-Graphed the Boyles law Graph on worksheet .

-Inverse relationship

gas law regents level dittos 0910.pdf

gas law regents level dittos 0910 key.pdf

2.   Proof of Pressure / Boyles Law  demos,

– Flat square

– vacuum chamber

Pressure square demo with our 4th graders:

Marshmallows and the  Vacuum Chamber:

Boyles Law Demo: Pressure decreases the volume increases – (inverse relationship).

Todays lesson: