Chpt10 - Chapter 10 Gases Characteristics of Gases Tend to...

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Unformatted text preview: Chapter 10 Gases Characteristics of Gases Tend to have low molecular weights Elements or molecular compounds composed of nonmetals Substances that are liquid or solid under ordinary conditions can also exist as gases called vapors . Unlike liquids and solids, gases Expand to fill their containers Are highly compressible Have extremely low densities Gas atoms or molecules are very far apart Always form homogeneous mixtures Pressure is the amount of force applied to an area. Pressure Atmospheric pressure is the weight of air per unit of area. P = F A Units of Pressure Pascals 1 Pa = 1 N/m 2 Bar 1 bar = 10 5 Pa = 100 kPa Units of Pressure mm Hg or torr These units are literally the difference in the heights measured in mm ( h ) of two connected columns of mercury. Atmosphere 1.00 atm = 760 torr Standard Pressure Normal atmospheric pressure at sea level. It is equal to 1.00 atm 760 torr (760 mm Hg) 101.325 kPa Manometer Used to measure the difference in pressure between atmospheric pressure and that of a gas in a vessel. The Gas Laws Four variables are needed to define the physical condition of a gas Temperature (T) Pressure (P) Volume (V) Amount of gas (n) The equations that express the relationships among these variables are the gas laws Boyles Law: PV Relationship Boyles Law states that the volume of a fixed quantity of gas at constant temperature is inversely proportional to the pressure. Boyles Law: PV Relationship A plot of V versus P results in a curve The value of the constant depends on the amount...
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Chpt10 - Chapter 10 Gases Characteristics of Gases Tend to...

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