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Gases are favored at “High T” and “Low P”Gases are favored at “High T” and “Low P”
• BUT specific T’s and P’s depend on the substance Water:o turns to a gas at 100C at 1 atm pressure; o if the pressure is about 2 atm (as in a pressure cooker),
won’t turn to a gas until about 120C O2 and N2 and CO2:oAre gases at room temperature and 1 atm pressureoNeed to be cooled to much lower T’s to turn to a liquid at 1
atm. (or compressed greatly to turn to a liquid at moderate T’s)
Gases’ properties (with respect to T, P, V, and n) are independent of the type of particle (substance)
Gases’ properties (with respect to T, P, V, and n) are independent of the type of particle (substance)
• As long as a substance is under “favorable conditions” to be in the gaseous state (appropriate T and P for that substance) ,
it turns out that it will behave the same way (with respect to
certain variables) as any other substance “acting like a gas under its favorable conditions”!
Chapter 09 Slide 5
--i.e., it doesn’t matter if the “gas” is water, methane, carbon dioxide. The size or mass of molecules doesn’t change the way it behaves! (Pretty amazing!)
--under such ”ideal” conditions, a substance is said to behave “ideally” as a gas. Called an “ideal gas”
--the behaviors of “ideal gases are described by “gas laws”
Gases Worksheet-I PracticeGases Worksheet-I Practice
• If A is inversely proportional to B then:If B doubles, then A becomes ½ of what it was!If B triples, then A becomes 1/3 of what it was!If B becomes 3.21 times what it was, then A becomes
____ times what it was.If B becomes x times what it was, then A becomes