Temp, volume, Pressure (Gases)
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We measure gases in Kelvin, not Celsius) Kelvins =
degrees Celsius +273
What is cubic centimeter abbreviated as? 1 cc is = to how much mL
cc 1 cc(cm^3) = 1 mL
Pressure is = ____/____
Pressure = Force/Area If you increase pressure, you decrease area
__ atm = ___ torr = ___ mmHg (millimeter of Mercury)
1 atm= 760 Torr =760mmHg
What are the 3 assumptions of an ideal gas?
1) the volume or size of each gas molecule is insignificant most accurate at LOW pressures 2) gas molecules collisions are perfectly elastic (they rebound off each other with sticking) most accurate at high temps and for gases with weak intermolecular forces 3) average kinetic energy of a gas depends only on the systems pressures
Gases behave most ideally under ___ pressure and ____ temperature
LOW pressure and HIGH temp
combined gas law
p1v1/n1t1 = p2v2/n2t2 p=pressure v=volume n=moles t=temperature
ideal gas law
PV = nRT R=ideal gas constant=0.0821 Latm/molK
STP stands for?
Standard Temperature and Pressure = 0 degrees celsius, 1 atm, 1 mol of any gas = 22.4 L
Boyle’s Law
V = 1/P
Charles’ Law
V = T, if everything else remains constant then V and T are directly proportional
Avogadro’s Law
V = n (moles) volume increases so does moles
Dalton’s Law of Partial Pressures says?
that the total pressure inside a container filled with multiple gases is equal to the sum of all of those gases’ individual pressures Ex: gasA =.3 atm, gasB=1 atm, gasC= .7atm >total pressure=.3+1+.7=2atm
What gases would effuse more quickly?
lighter gases (with lower molecular weights) escape (or effuse) more quickly than heavier gases
IF two gases are in the same container with the same temp, then they will have ___ kinetic energy?
the SAME kinetic energy
In order for two different gases (with different masses) than the lighter gas MUST?
move quicker
reality gas vs. ideal gas
• ideal gas is a theoretical gas whose behavior can be perfectly predicted by the ideal-gas law • real gases DO have volumes and intermolecular forces
The “real gas equation” corrects what two things fromideal gases?
1) an2/v2- intermolecular forces 2) nb- for volume * The closer these two terms are to zero, the more ideally the gas will behave