Pressure and Intro to Gases

Pressure and Intro to GasesWhich of the following hold true for most gases?Gas molecules are far apartGas molecules move randomlyGas molecules themselves have essentially no volumeAll of the aboveNone of the above

D2Kinetic Molecular TheoryHolds true for ideal gases Most gases behave ideally near standard temperature and pressure5 postulates/tenets about gas molecules:Constant, random motionNo attractive/repulsive forces between molecules (theyre too far apart to have intermolecular forces)Negligible volumes compared to the container occupiedKinetic energy increases as temperatures increaseElastic collisions

Standard temp is 0K, standard pressure is 1 atm3There are 4 variables that can be used to describe a sample of gasPressure (P)Temperature (T)Volume (V)Number of moles (n)PressureThe force acting on a specific areaPressure(P) = force area

Which of the following would be the greatest pressure?Standing on one foot in cowboy bootsStanding on two feet in cowboy bootsStanding on one foot in high heelsStanding on two feet in high heelsC has the largest mass (body weight, presumably) on the smallest area (a single high heel)5Units of PressureLook at your conversion chart.mm Hg is millimeters of mercury.strangea height of a substance is a pressure.historicalWhat was the force keeping the mercury in the glass tube?Atmospheric pressure was first measured in 1643 by Italian Torricelli while playing with mercury

He notices that the level of mercury changed with the weather. Lows often precluded a storm.7Giant Water Barometer, Netherlands, 1990

A water barometer is 13.6 times taller than a mercury barometer (density of mercury = 13.6 g/mL) becauseA) water is less denseB) water is heavierC) Air is more dense than waterD) I dont knowUnits of PressureLook at your conversion chart.Convert 10 psi to mmHgConvert 2.01 atmospheres into pascalsConvert todays pressure into atmospheresWhats Your Foot Pressure?Trace the outline of your shoe on the graph paper in your lab notebook (a partner may need to help)Calculate your pressure in psi. [Hint: what information would you need to calculate psi?]Convert it to atm.Convert your pounds-per-square-inch into kiloPascals (kPa).