6 chem 107 class

6 chem 107 class - Chapter 5 PROPERTIES OBSERVABLE...

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1 GASES Chapter 5 OBSERVABLE PROPERTIES OF GASES Expand to fill the volume of any container Mix readily with one another Have much lower densities than solids or liquids Volumes change dramatically with temperature Densities change drastically with conditions PROPERTIES GENERAL OBSERVATION changing the temperature, pressure or volume of a gas’s container results in a dramatic response from the gas CHARLES’ LAW V 1 /T 1 = V 2 /T 2 gases expand as temperature is increased PROPERTIES OF GASES PROPERTIES OF GASES CHARLES’ LAW PROPERTIES OF GASES CHARLES’ LAW Watch the vidoe entitled Egg in a Bottle http://exploscience.com/ChemTV_Page_3.html BOYLE’S LAW At constant temperature, pressure and volume are inversely proportional. P 1 V 1 = P 2 V 2 PROPERTIES OF GASES
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2 UNDERSTANDING PRESSURE P = F/A PROPERTIES Molecules of a gas, in the process of expanding to fill the entire volume of the container, exert a force on the container’s walls. The amount of force exerted over the surface area of the container’s walls is described as pressure. PRESSURE OF GASES ATMOSPHERIC PRESSURE PRESSURE OF GASES The decrease in atmospheric pressure as the distance from the earth’s surface increases is caused by a decreasing gravitational pull on the gas molecules BAROMETER Device used to measure atmospheric pressure. MERCURY BAROMETER Units read: mm Hg Typical atmospheric pressure: 740-760 mm Hg MEASURING PRESSURE UNIT CONVERSIONS 1 mm Hg = 1 torr 1 atm = 760 torr 1 atm = 101,325 Pa (Pascal) 1 atm = 101.325 kPa 1 Pascal = 1 N m -2 Another common unit (we will not use): psi = pounds per square inch. HOW TO CONVERT FROM psi TO Pa?
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6 chem 107 class - Chapter 5 PROPERTIES OBSERVABLE...

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