# Ch 9 Ppt

 Gas mixtures are __ and __. homogeneouscompressible Gases above us __ on us, causing __ affected by the __. push down pressuregravitational pull What is the typical tool for measuring pressure? barometer What is the amount of mercury that goes in a barometer? 760 mm In a barometer, as the pressure incresaes, what happens to mercury? As the pressure decreases, what happens to mercury? pressure increses, mercury goes up; greater heightpressure decreases, mercury goes down; smaller height Ideal Gas a gas whose behavior follows the gas laws exactly; independent; a gas that doesn't interact with anything THe physical properties of a gas can be defined by four variables: pressuretemp in Kvolumenumber of moles What is the formula for the Combined Gas Law? (P1V1/T1)=(p2V2/T2) Another name for Boyle's Law? Relationship between volume and pressure? Pressure-Volume Lawinverse relationship Another name for Charles' Law? Relationship between volume and temperature? Temperature- Volume Lawdirectly proportional Significance of absolute zero? no motion Formula for: Boyle's Law P1V1=P2V2 Formula for: Charles' Law V1/T1=V2/T2 Formula for: Avogadro's Law V1/n1=V2/n2 Ideal gases obey an equation incorporating the laws of __, __, and __.  The formula is: Charles, Boyle, and AvogadroPV=nRT Formula for: Density and Molar Mass Calculations d=mass/ volume= (n x M)/ V = (P x M)/ (R x T) You can calculate the __ or __ of a gas. The density of a gas is usually very __ under atmospheric conditions. densitymolar mass (M)low In __, for a constant temperature and pressure, volume is __ to moles. gas stoichiometryproportional Mole Fraction Xi= (ni)/(ntotal) or Xi= Pi/Ptotal Kinetic Molecular Theory: What does it present? physical properties of gases in terms of hte motion of individual molecules Postulates of Kinetic-Molecular Theory: 1 A gas consists of tiny particles, either atoms or molecules, moving about at random Postulates of Kinetic-Molecular Theory 2 The volume of hte particles themselves is negligible compared with the total volume of the gas; most of the volume of a gas is empty space Postulates of Kinetic-Molecular Theory 3 The gas particles act independently of one another; there are no attractive or repulsive forces between them Postulates of Kinetic-Molecular Theory 4 Collisions of the gas particles, either with other particles or with the walls of a container, are elastic (constant temp) Postulates of Kinetic-Molecular Theory 5 The average kinetic energy of the gas particles is proportional to the Kelvin temperature of the sample What is Root-Mean-Square measure of the average molecular speed Diffusion mixing of different gases by random molecular motion and collision Effusion when gas molecules escape without collision, through a tiny hole into a vacuum Graham's Law rate of effusion is proportional to its rms speed Deviation results from assumptions about ideal gases. What are the two molecules in gaseous state do exert any force, either attractive or repulsive on one anotherVolume of the molecules is negligibly small compared with that of the container The volume of a real gas is __ than predicted by the ideal gas law. larger At lower pressure, the volume of the gas particles is __ compared to the total volume. negligible At higher pressure, the volume of the gas particiles is __ to the total volume. more significant compared The volume ofa real gas at high pressure is __ than the ideal value. larger Attractive forces between particles become more important at __. higher pressures AuthorDesLee26 ID192870 Card SetCh 9 Ppt DescriptionGases: Their Properties and Behavior Updated2013-01-28T04:57:55Z Show Answers