Matter & Energy – Gases Aim: How do gases react due to changes in temperature, pressure, and volume?. Do Now: According to Reference Table H, which substance has the highest vapor pressure at 75 o C? HW:. Pressure & Moles. Rigid container pump in more air What happens to # of collisions?
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Matter & Energy – GasesAim: How do gases react due to changes in temperature, pressure, and volume?
According to Reference Table H, which substance has the highest vapor pressure at 75oC?
What happens to KE of mlcls as the T increases?
What happens to size of container (if the walls are flexible?)
The (1) refers to initial conditions, the (2) refers to new/final conditions
At a temperature of 273 K 400ml gas sample has a pressure of 101.3kPa. If the pressure is changed to 50.65kPa, at which temperature will this gas sample have a volume of 551ml?
P1V1 = P2V2
P1 = 101.3kPa 101.3kPa x 400ml =50.65kPa x 551ml
V1 = 400ml 273K T2
T1 = 273K 101.3kPa x 400ml x T2 = 50.65kPa x 551ml x 273K
P2 = 50.65kPa T2 = 188K
V2 = 551ml
T2 = X
P1V1 = P2V2
P is constant, so we cross it out!
V1 = V2
Initial ConditionsFinal Conditions
P1 = 1 atm P2 = 2 atm
V1 = 20 L V2 = ?
T1 = 273 K T2 = 200 K
(Note: the T & P
values are from Table A!
We use the atm unit for
pressure b/c atm is used in
the problem, not kPa.)
A sample of gas confined to a volume of 10 L at 10oC and 2 atm is subjected to a pressure increase to 2.5 atm and a temperature decrease of 10oC. What is the new volume?
remains the same
directly proportional to the Celsius temperature.
inversely proportional to the Kelvin temperature.
inversely proportional to the Celsius temperature