CHAPTER 11GAS LAWSPages 361-391

7 Stamps7 warm ups!

BACKGROUND INFORMATIONAir is composed of several kinds of colorless gases.Some gases have color.Chlorine (Cl2): yellow greenNitrogen Dioxide (NO2): brownish-red

Any 1 mole of a gas occupies a volume of 22.4 L.

KINETIC MOLECULAR THEORY OF GASESIdeal Gas: A hypothetical gas that perfectly fits all assumptions of the kinetic-molecular model.

Real gas: A gas that does not behave according to the assumptions of the kinetic-molecular theory.

KINETIC MOLECULAR THEORY OF GASES1. Gas Consists of large numbers of tiny particles that are far apart relative to their size.2. Collisions between gases are always elastic. An elastic collision is one where there is no net loss of total kinetic energy.

3. Gas particles are in continuous, rapid, random motion.

4. There are no forces of attraction between gas particles.

5. The temperature of a gas depends on the average kinetic energy of the particles.

GASES AND PRESSUREPressure: Force per unit area on a surface

Equation= FORCE AREA

Pressure= area

Pressure= area

GASES AND PRESSURE

GASES AND PRESSUREDifferent units for measuring pressure: (need to memorize!)1 atm760 mmHg101.3 kPa101300 Pa760 torr14.7 lb/in2

CONVERTING PRESSURE745mmHg=_________________Kpa

16.5atm=__________________lb/in2

11.3 lb/in2=_________________Kpa

100.7Kpa=__________________atm

Barometer: Instrument used to measure pressure.

TEMPERATURE CONVERSIONSTemperature: Kelvin system:K=C+273

-16C=__________K8.7C=___________K212K=__________C0K=_____________C

Standard Temperature and Pressure (STP): Temperature: 273 KPressure: 1 atm760 mmHg101.3 kPa101300 Pa760 torr14.7 lb/in2

DALTONS LAW OF PARTIAL PRESSUREThe sum of the partial pressures of all the components in a gas mixture is equal to the total pressure of a gas mixture.

Equation: P1 + P2 + P3 + . = PTotal

DALTONS LAW OF PARTIAL PRESSUREEXAMPLESA person using an oxygen mask is breathing air with 33% oxygen. What is the partial pressure of oxygen with the air pressure in the mask is 110Kpa?

DALTONS LAW OF PARTIAL PRESSUREEXAMPLESWhat is the atmospheric pressure if the partial pressure of nitrogen, oxygen and argon are 604.5mmHg, 162.8mHg, and 0.5mmHg, respectively?

DALTONS LAW OF PARTIAL PRESSUREEXAMPLESOxygen gas from the decomposition of potassium chlorate was collected by water displacement. The barometric pressure and the temperature during the experiment were 731.0 torr and 20.0C. What was the partial pressure of the oxygen collected? (Hint: Use Table A-8 in your text!)

PRESSURE AND VOLUME: BOYLES LAWThe volume of a gas is indirectly proportional to the Pressure (@ S.T)

Equation: P1V1 = P2V2

Visually:

PRESSURE AND VOLUME: BOYLES LAWEXAMPLESA gas has an initial volume of 242cm3 at a pressure of 87.6Kpa, what is the volume if the pressure changes to standard pressure?

PRESSURE AND VOLUME: BOYLES LAWEXAMPLESA gas at a pressure of 608mmHg is held in a container with a volume of 545cm3. The volume of the container is then increased to 1065cm3 without a change in temperature. Calculate the new pressure of the gas

VOLUME AND TEMPERATURE: CHARLES LAWThe volume of a gas is directly proportional to the temperature (@ S.P).

Equation: V1 = V2 T1 T2

Visually:

VOLUME AND TEMPERATURE: CHARLES LAW

Animations

http://www.marymount.k12.ny.us/marynet/06stwbwrk/06gas/1esepcharles/esepcharles.html

http://www.marymount.k12.ny.us/marynet/06stwbwrk/06gas/2slyscharles/2slysflash.html

VOLUME AND TEMPERATURE: CHARLES LAW - EXAMPLESIf 20.0L of Oxygen gas are cooled from 100C to 0C. what is the new volume?

VOLUME AND TEMPERATURE: CHARLES LAW - EXAMPLESA gas can be used as a thermometer. IF it is known that the sample of gas has a volume of 1.00L at 255K, what is the temperature if the volume of the same gas sample is changed to 0.45L

PRESSURE AND TEMPERATURE: GAY-LUSSACS LAW

The pressure of a gas is directly proportional to the temperature (@ constant volume).Equation:

PRESSURE AND TEMPERATURE: GAY-LUSSACS LAW - EXAMPLESThe gas in a container is at a pressure of 3.00 atm at 25C. Directions on the container warn the used not to keep it in a place where the temperature exceeds 52C. What would the gas pressure in the container be at a 52C?

PRESSURE AND TEMPERATURE: GAY-LUSSACS LAW - EXAMPLESAt 120.0C the pressure of a sample of nitrogen is 1.07 atm. What will the pressure be at 205C, assuming constant volume?

COMBINED GAS LAWIncorporates both Boyles and Charles laws. It relates pressure, volume and temperature.

Equation: P1V1 = P2V2 T1 T2

COMBINED GAS LAWEXAMPLESA gas has a volume of 10.0cm3 measured at 75.6Kpa and 60.0C, what is the new volume if conditions change to STP?

COMBINED GAS LAWEXAMPLESA gas that had a volume of 955cm3 measured at 58C and 108.0Kpa, what will be the new volume if the conditions change to 76.0C and 123.0Kpa?

GAY-LUSSACS LAW OF COMBINING VOLUMES OF GASESat constant _______________ and _________________, the _______________ of gaseous reactants and producs can be expressed as _____________ of _________________ _____________ ________________.

Animationhttp://www.marymount.k12.ny.us/marynet/06stwbwrk/06gas/1amcslussac/amcsgaylussac.html

VOLUME AND MOLES: AVAGADROS LAWThe volume of a gas is _____________proportional to the number of moles of that gas (@ S.T).

Equation:

An anmimation: http://www.marymount.k12.ny.us/marynet/06stwbwrk/06gas/2lpimavogdro/2lpimavogadro.html

VOLUME AND MOLES: AVAGADROS LAWEXAMPLESSuppose we have a 12.2 L sample containing 0.50 moles of oxygen gas at a pressure of 1 atm and a temperature of 25 C. If all of this oxygen is converted to ozone, O3, at the same temperature and pressure, what will be the volume of ozone formed?

VOLUME AND MOLES: AVAGADROS LAWEXAMPLESConsider two samples of nitrogen gas. Sample one contains 1.5 moles of nitrogen and has a volume of 36.7 L at 25 C and 1 atm. Sample 2 has a volume of 16.5 L at 25 C and 1 atm. Calculate the number of moles of nitrogen in sample 2.

GAS STOICHIOMETRY:Standard molar volume of a gas: The volume occupied by ____________ ___________ of a gas at STP has been found to equal ______________________.

Example: What volume does 0.0685 mol of gas occupy at STP?

GAS STOICHIOMETRY:EXAMPLEPropane, C3H8, is a gas that is sometimes used as a fuel for cooking and heating. It undergoes a combustion reaction. What will be the volume of oxygen required for the complete combustion of 0.350L of propane?

THE IDEAL GAS LAWPV=nRT

WhereP =V=n=R=T=

THE IDEAL GAS LAWEXAMPLESWhat pressure will be exerted by .622 mol of a gas contained in 9.22L at 16C. Find pressure in Kpa.

THE IDEAL GAS LAWEXAMPLESHow many moles of a gas will occupy a 486cm3 flask at 10.C and 66.7 Kpa?

THE IDEAL GAS LAWEXAMPLESWhat volume will be occupied by .684mol of gas at 99.4Kpa and 9C?

DIFFUSION AND EFFUSIONDiffusion:

Effusion:

Animation: http://www.marymount.k12.ny.us/marynet/06stwbwrk/06gas/2hdkrdiffusion/2hdkrdiffusion.html

DIFFUSION AND EFFUSIONGrahams Law: Rates of _________________ of gases at the same _____________ and ______________ are inversely proportional to the _______________ ____________ of their ________________ ________________.

DIFFUSION AND EFFUSIONEXAMPLESCompare the rates of effusion of hydrogen and oxygen at the same temperature and pressure.

DIFFUSION AND EFFUSIONEXAMPLESCompare the rate of effusion of carbon dioxide with that of hydrogen chloride at the same temperature and pressure.

Animation Summary:http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/gasesv6.swf

Web Questhttp://www.chemheritage.org/EducationalServices/webquest/blimp.htm