Gas Variables POGIL
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Transcript Gas Variables POGIL
GAS VARIABLES POGIL
Proportionality
ο¨
Directly Proportional
ο€ As
ο€π¦
ο¨
one increases, so does the other
=πβπ₯
Inversely Proportional
ο€ As
ο€π¦
one increases, the other decreases
=
π
π₯
Thermodynamic Observables
ο¨
Aspects of a system that we can observe, measure, or
calculate in some way.
ο€
Pressure β P
kilopascals (kPa)
ο€
Temperature β T
Kelvin (K)
ο€
Volume β V
Liters (L)
ο€
moles β n
(number of molecules)
moles
Gas Variables POGIL
ο¨
Stop After Question 11
Bell: 1/14
ο€ Warm-up
ο€ Answer
ο¨
Week # 2
at the front
on bell sheet
Objective:
ο€I
can describe how the gas variables relate to one
another.
Announcements
ο¨
SAGE interim testing
ο€ All
next week
ο€ Bring Head Phones
Review: Question 3
ο¨
Which gas variables is most closely related to the
length of arrows in model 1?
Review: Question 6
ο¨
Two factors that influence the pressure of a gas:
ο€ 1:
ο€ 2:
ο¨
How do these effect the pressure of a gas?
Review: Question 11
Experiment A
(Adding More Gas)
Direct or Inverse?
Algebraic Expression
Experiment B
(Heating the Gas)
Gas Variables POGIL
ο¨
Stop after Question 16
Question 12b
ο¨
What is always true for the external and internal
pressure of a gas in a flexible container?
Question 16
ο¨
Provide a molecular level explanation for the
increase in volume among the balloons in
experiment E.
Gas Variables POGIL
ο¨
Stop after Question 21
Key Concept: Question 20
Experiment C
Experiment D
(Adding More Gas) (Heating the Gas)
Direct or Inverse?
Algebraic
Expression
Experiment E
(Reducing the
external pressure)
Gas Laws
Boyleβs Law
Charlesβ Law
Gay-Lussacβs Law
Avagadroβs Law
π
π=
π
π = ππ
π = ππ
π = ππ
Combined Gas Law:
ππ
π
=π
Quick Quiz
ο¨
A gas is kept in a non-flexible container.
ο€ What
would happen to the gases pressure if the volume
of the container is decreased?
ο€ What
would happen to the gases temperature if the
pressure were to be increased?
Using the Gas Laws
Combined Gas Law:
ππ
π
=π
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Step 1: List all knowns and unknowns
ο¨
Step 2: make two combined gas laws
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Step 3: make the two gas laws equal
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Step 4: Plug and Chug
Example:
ο¨
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A gas in a 500 ml non-flexible container is heated
from a temperature of 20 K to a temperature of 30
K. If the pressure of the gas was originally 50 kPa,
what is the new pressure of the gas?
Step 1: List knowns and unknowns
ο¨
Step 2: make two combined gas laws
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Step 3: make the two gas laws equal
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Step 4: Plug and Chug
Example:
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A gas in a non-flexible container with a volume of 1
L is cooled from a temperature of 50 K to a
temperature of 45 K. What is the new volume of
the gas?
Step 1: List knowns and unknowns
ο¨
Step 2: make two combined gas laws
ο¨
Step 3: make the two gas laws equal
ο¨
Step 4: Plug and Chug
Gas Laws Worksheet
ο¨
Due Friday