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Lecture 5

CHEM 1150 Lecture 5: NOTES SET 5

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CHEM 1150

NOTES SET 5 pressure force exerted per unit area of surface acceleration change of speed per unit time pascal (Pa) SI unit of pressure; 1 Pa = 1kg(ms^2) barometer device for measuring the pressure of the atmosphere manometer device that measures the pressure of a gas of liquid in a sealed vessel millimeters of mercury (mmHg or torr) traditional unit of pressure equal to that exerted by a 1mm column of mercury at 0.00C in a barometer or manometer atmosphere (atm) tradition unit of pressure equal to exactly 760 mmHg; 1 atm = 101.325 kPa, exact compressibility ability to be squeezed into a smaller volume by the application of pressure Boyles law the volume of a sample of gas at a given temperature varies inversely with the applied pressure {PV} linearly term describing how one variable changes with the change in another variable if a plot of the two variables gives a straight line extrapolate to extend a line beyond the plotted data points Kelvin scale absolute temperature scale on which the units (kelvins, K) are given by K = C + 272.15 Charless law the volume occupied by any sample of gas at a constant pressure is directly proportional to the absolute temperature {VT} law of combining volumes the volumes of reactant gases at a given pressure and temperature are in ratios of small whole number Avogadros law equal volumes of any two gases at the same temperature and pressure contain the same number of molecules molar gas volume (Vm) volume occupied by one mole of any gas at a given temperature and pressure standard temperature and pressure (STP) reference conditions for gases chosen by convention to be 0C and 1 atm pressure molar gas constant (R) constant or proportionality relating the molar volume of a gas to TP
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