## Chem

##### Created by:

hfast  on January 14, 2010

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# Chem

 Why water is liquid at room temph-bonding , significant attraction of forces.
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#### Definitions

Why water is liquid at room temp h-bonding , significant attraction of forces.
Why water becomes a gas at 100 degrees C h-bonds have enough energy to break their bonds
Temperature is the measure of kinetic energy
Pressure at absolute zero none because theres no motion, colisions, pressure
Gasses are easily compressable because Theres so much space between empty particles of gas, at room temp the space between the particles of gas is 10x the gases' volume
1 atm= 760mm Hg
1 atm = 101.3kPa
Real gasses differ at low temperature and high pressures. Why? because gas shrinks and doesnt ocpy alot of aspace.
Why popcorn pops there is water inside each kernel and when its heated the pressure increases inside each kernel until it has to pop
Ideal Gas Equation PV= nRT
R= 8.31 L kPa/ mol K (conditions of one mol of gas at STP)
Why attraction of particles is significant At low temps theres not enough KE to overcome attractions, theyre less far apart so intermolecualr forces take hold
Ptotal p1 + p2+ p3 ...
Diffusion the mixing of gasses as they fill their container
STP 0C, 101.5 kPa
Pressure and Temperature P1/T1 = P2/T2
Volume, pressure, temperature P1V1/T1 = P2V2/T2
Pressure and Volume P1V1= P2V2
Temp and volume V1/T1 = V2/T2
Effusion A gas escapes from a tiny hole in its container
law of effusion Rate a/rate b= square root of molar mass a/ molar mass b
Barometer Used to measure atmospheric pressure

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