gas stoichiometry. random thoughts 1) we live immersed in a gaseous solution
TRANSCRIPT
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GasStoichiometry
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Random Thoughts
1) We live immersed in a gaseous solution.
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Random Thoughts
1) We live immersed in a gaseous solution.
2) We live at the bottom of an ocean of air.
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Random Thoughts
1) We live immersed in a gaseous solution.
2) We live at the bottom of an ocean of air.
3) Pressure goes from High to Low
Demo: Low Budget Super soaker
Jar with screen
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Pressure Defined
1) Pressure = Force / Area
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Pressure Defined
1) Pressure = Force / Area
Demo: Nail Board & Cup Holder
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Pressure Defined
2) Number of collisions of gas molecules on its surroundings.
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Pressure Defined
2) Number of collisions of gas molecules on its surroundings.
Demo: Drink Box
Demo: Shrink Wrapping
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Pressure Defined
3) Really the result of the mass of air being pulled to the center of earth.
Gravity
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Instrument that measures pressure:
The Barometer - invented by Torricelli; often used mercury as liquid.
--> We get a couple of units from this!
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The barometer
High Pressure or Low?
Pair?
Pgas?
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The barometer
High Pressure or Low?Gas Inside
OutsideAir pressure
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The barometer
High Pressure or Low?Gas Inside
OutsideAir pressure
Low pressure=> outside is losing the push vs the inside.
Pgas = Pair + height
difference
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The Barometer High Pressure? Air would be pushing down harder.
Pgas = Pair - height
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Lecture Problem-Barometer
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Standard Pressure ==> Units
760 mmHg 760 torrs 101300 Pascals 101.3 kPas 1 atm 14.7 lbs/in2
Show dimensional analysis
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Gas Law Problems: We have a problem with the gas molecule.
Why is this a problem? 1) They show attraction! Can’t in Gas Law Problems1) They take up space!!! Can’t in Gas Law
Problems
It’s our Physics problem: “Disregard air resistance” How do you do that?
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Real Gases
1) They do exist.
2) They can liquefy - condensation of vapor.
3) They don’t follow gas laws.
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Ideal Gases
1) They don’t exist.
2) They can’t liquiefy.
3) They follow the gas laws.
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So when do gases behave ideally so we can use them in our gas laws?
Where they show no attraction to each other:
What conditions would that be?
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So when do gases behave so we can use them in our gas laws? Ideally
Where they show no attraction to each other:
What conditions would that be?
1) Low pressures
2) High temperatures