Q2 : Week 7 – 1/2- 1/6
<Week 6 – Week 8> Jump to: Tuesday, Wednesday, Thursday, Friday
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1/2 – Monday – New Years Day Observance
Main focus –
a) To introduce the concept of Stoichiometry through gases.
b) To learn of the story of Torricelli and the birth of the manometer.
c) To measure pressure with a manometer
Period 2/3a:
1.Review the Volumetric Titration Tests –
Volumetric Titrations and Spectrophotometry 1 test key.pdf
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Volumetric Titrations and Spectrophotometry 2 test key.pdf
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2. Connections of our last learned concepts to our new concept of gas laws.
3. Manometer introduction – The first measurement of pressure.
– definition of pressure – bed of nails demo = P = F/A
– Lungs / Syringes / Pistons / Nothing sucks!!! – Just high pressure moving to low pressure due to pressure changes.
showed how area changes can affect Pressure quantities for intro to Boyles Law
Period 4:
1. Same as above except the review of the last test will be tomorrow.
Gas Law Segway:
In lab 16, we dissolved the brass shot with nitric acid. The balanced reaction that you needed for the lab is given below:
You can see that the product of the reduction of the nitrate ion (NO3- ) is NO2 which is released as a brown gas. Let’s take a look at the time lapse of this reaction.
Lab 16 oxidation of Cu and Zinc in brass:
YES!!! We can use the volumes measured through gas generating reactions to…
1. determine the limiting reagent 2. Determine the amount of the reagents ( amount of active ingredients, % by mass ) 3. Determine the empirical formula? (mole ratios of atoms. 4. identify the compound (molecular mass. 5. Determine the Amperage needed to power this non-spontaneous reaction?
In how many reactions that we witnessed or discussed in class up to this point did we generate a gas? Did we generate a gas in electrolytic cells? Did we split water using an electrolytic cell?
I did this demo in class.


Gas Law Pressure Intro Presentation:
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1/3 – Tuesday’s Homework: –
1. Please complete the lecture above if necessary– Story of Torricelli continues –
End Of Monday!!!
_______________________________________________________________________ Jump to: Wednesday Homework / top 1/4 – Wednesday – B Day – 2, 3b Lab/4
a) To identify the units of pressure and their equivalents
b) To derive the ideal gas law equation and the combined gas law equation.
c) To introduce the Universal Gas Constant.
Period 2:
1. Complete the story of Torricelli and the water pump
a) Nothing sucks, suction cups, discussion of straws, Romans hiding in river with Reeds
b) Examples of Manometers – gauge pressure (view the back) / sphygmomanometer demo –
2. We will review the Manometer homework, especially the word problems.
a) water demo /cardboard/large Flask.
Derivation Notes:
Combined Gas law Formula animation:
Gas Law Derivation animations:
Large Flask Demo from past years:
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1/4 – Wednesday Homework: –
1. a) Please watch the last few minutes (from 13:50 on) of the gas law derivation posted below.
End Of Monday!!!
End Of Monday!!!
_________________________________________________________________________ Jump to: Thursday Homework / top
1/5 – Thursday – A Day – 2/3a Lab, 4
a) To have guided practice with the Ideal Gas Law Equation and Combined Gas Law
b) To identify Gas Law problems in other “Units”.
c) To identify the individual relationships between gas variables.
Period 2/3a:
1. Review the last nights Homework –
a) identify the formula used – Last night’s Homework review – When to use Dynamic or Static
2. Review of variable relationships from derivation – (draw graphs for period 2 in derivation)
– relationship only works when other variables are held constant
New pressure – unit Kilo pascals – from pressure intro presentation
Period 4:
1. Same as above but will not finish all demos and will not get to start tonights homework.
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1/5 – Thursday Homework: –
1. Please view page 2 of the Pressure Intro Presentation (re-posted below) it derives for you the kilo pascal pressure (our 4th). Currently we have the following equivalent units of pressure:
Standard Pressure = 1 atm (atmposphere) =
760 mm Hg = 760 torr =
14.7 psi (pounds per square inch) =
101.3 kPa (kilo Pascals) → you will see this in Regents Chemistry
2. Please complete following worksheet and review with the key.
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Gas Law Pressure Intro Presentation:
__________________________________________________________ Jump to: Friday Homework / top 1/6 – Friday – B Day – 2, 3b Lab/4
a) To Derive the standard unit of Pressure = Pascals
b) To Derive the density and Molecular mass of a gas
1. New pressure – unit Kilo pascals – derivation from pressure intro presentation
2. Boyles Law demo with Tornado tubes – Final relationship with 1st derivation – (make graph)
a) Boyles Law destroyed with liquid nitrogen – gauge pressure – Cracking knuckles, using a straw, fish face!
3. Ideal Gas Law Relationship – egg in and out of the bottle – Both ways
4. New Derivation of Density and Molecular Mass of a Gas
Period 3b/4:
1. Same as above, include shaving cream demo, racket spheres
2. Determination of Absolute zero activity – possibility
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1/6 – Weekend Homework: –
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2. Please study the Ideal Gas Law Derivation and the Molecular mass/Density Derivation for tomorrow’s Quiz. I have posted both derivation video below for your review.
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3. Please complete the following worksheet that is based on the newly derived Molecular Mass and Density equations and review with the key below:
This will be collected Monday as well!
Gas Law worksheet 5 – density, MM, Stoich.pdf
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Gas Law worksheet 5 – density, MM, Stoich KEY.pdf
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End of week 7!