chapter 3 sec. 2 the gas laws. force distributed over an area (newton / meter 2 ) units: n/m 2 or...
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Chapter 3 Sec. 2
The Gas Laws
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Force distributed over an area (Newton / meter 2)
Units: N/m2 or Pascal (Pa)
More collisions and greater speed of gas molecules increases pressure
Pressure
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Factors that Affect Gas Pressure
TemperatureIncrease of temp Increase of K.E.Increase K.E. increases the pressure
VolumeReducing the volume of a container increases
the pressure
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Factors that Affect Gas Pressure
Number of ParticlesIncrease number of Particles Increase PressureWhy do you put more air in your tires in the winter?
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Boyle’s LawBoyle’s Law
The volume of a fixed amount of gas varies inversely with pressure of the gas.
P1V1 = P2V2
Boyle’s Law
Pressure Volume
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Charles’s LawCharles’s Law
The volume of a gas varies directly with the temperature of the gas.
V1T2 = V2T1
Charles’s Law
Temp Volume
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Combined Gas Law
Describe that of Charles's and Boyle’s LawP1V1= P2V2
T1 T2
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Solve
A cylinder contains air at pressure of 100 kPa has a volume of 0.75 L. The pressure is increased to 300 kPa. Temp does not change, Find the new volume of air.
P1 = 100 kPa P2 = 300 kPa V1 = 0.75 L
V2 = ?
P1V1 = P2V2 (100 kPa x 0.75 L) = (300 kPa x V2)
0.25 L