The Gas Laws Mathematical relationships between volume, temperature, pressure & amount of gas

Variables that Affect Behavior Number of particles (n) Pressure (P) Volume (V) Temperature (T)

Standard Temperature and Pressure STP 0oC or 273K [Remember: K = oC + 273] Standard Pressure 1 atm 760 mmHg 760 torr 101.3 kPa STP

Boyles Law Constant Variables: Number of particles (amount) Temperature Formula: P1V1 = P2V2 Volume of gas is inversely proportional to the pressure  V =  P

Boyles Law Graph http://www.grc.nasa.gov/WWW/K-12/airplane/boyle.html

Boyle’s Practice P1V1 = P2V2 A gas occupies a volume of 259cm3 at 112 kPa. What volume will gas occupy at standard pressure? V1 = P1 = V2 = P2 =

Charles’ Law Constant Variables: Number of particles (amount) Pressure Formula: Volume of gas is proportional to temperature  T =  V V1 T1 V2 T2 =

Charles’ Law Graph http://www.grc.nasa.gov/WWW/K-12/airplane/glussac.html

Temperature MUST, MUST, MUST be in KELVIN *VERY IMPORTANT* Temperature MUST, MUST, MUST be in KELVIN

Charles Practice V1 T1 V2 T2 = A gas occupies 907cm3 at 19.0oC. If the pressure remains constant what volume will the gas occupy at standard temperature? V1 = T1 = V2 = T2 =

Gay-Lussac’s Law Constant Variables: Number of particles (amount) Volume Formula: Pressure is proportional to temp (K)  P =  T P1 T1 P2 T2 =

Gay-Lussac’s Graph

Temperature MUST, MUST, MUST be in KELVIN *VERY IMPORTANT* Temperature MUST, MUST, MUST be in KELVIN

Gay-Lussac Practice P1 T1 P2 T2 = A gas at 715mmHg has a temperature of 25.0oC. If the volume is held constant, what will the temperature of the gas be at standard pressure? P1 = T1 = P2 = T2 =

Combined Gas Law Combination of all three laws Based on fact that gases generally undergo changes in T, V and P simultaneously Formula: Remember: Temp in Kelvin

Combined Practice P1 T1 P2 T2 V1 V2 = V1 V2 A gas occupies 51.7mL at 27.0oC and 90.9 kPa. What volume will the gas occupy at STP? V1 = P1 = T1 = V2 = P2 = T2 =

Website http://www.blackgold.ab.ca/ict/Division4/Science/Div.%204/Boyles%20Law/boyleslaw.htm http://videos.howstuffworks.com/hsw/12267-investigating-chemical-properties-scuba-diving-video.htm