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Things to Ponder Scratch a dog and youll find a permanent job. Money will buy a fine dog, but only kindness will make him wag his tail. Scratch a dog and youll find a permanent job. Money will buy a fine dog, but only kindness will make him wag his tail.

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Gas Laws Lesson 3

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Avogadro's Principle States that equal volumes of gases at the same temperature and pressure contain equal number of particles.

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Crystal lattice A well - defined, three -dimensional arrangement, repeated throughout the solid.

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Liquid crystal When a solid melts, its crystal lattices disintegrate and its particles lose their three-dimensional pattern.

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Equivalent Pressures 1 atm 760 Hg 760 Torr 14.7 psi 101.3 kpa

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Problem 1 How many atm are in 856 torr? Answer 1.13 atm How many atm are in 856 torr? Answer 1.13 atm

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Problem 2 How many Pa are in 16.4 atm? Answer 1661320 Pa or 1.66 x 10 6 Pa How many Pa are in 16.4 atm? Answer 1661320 Pa or 1.66 x 10 6 Pa

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Viscosity The stronger the intermolecular forces, the higher is the viscosity. Viscosity also increases with the mass of a liquids particles and the length of molecule chains. A measure of the resistance of a liquid to flow is called viscosity.

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Amorphous Solids Examples of amorphous solids include glass, rubber, cotton candies, slime, and many plastics.

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Melting Point Temperature of the solid when its crystal lattice begins to disintegrate.

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Freezing point Temperature of a liquid when it begins to form a crystal lattice and becomes a solid.

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Boiling Point Temperature of the substance when its vapor pressure equals the pressure exerted on the surface of the liquid. (For liquids in an open container, the pressure exerted equals atmospheric pressure.) Is affected by change in pressure. Temperature of the substance when its vapor pressure equals the pressure exerted on the surface of the liquid. (For liquids in an open container, the pressure exerted equals atmospheric pressure.) Is affected by change in pressure.

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Sublimation Process by which particles of a solid escape from its surface and form a gas. Ex: CO 2 and clothes on a clothes line during freezing temps. Process by which particles of a solid escape from its surface and form a gas. Ex: CO 2 and clothes on a clothes line during freezing temps.

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Condensation The process by which a gas or vapor becomes a liquid. It is the reverse of vaporization. Ex: Dew The process by which a gas or vapor becomes a liquid. It is the reverse of vaporization. Ex: Dew

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Vapor Pressure Is the pressure exerted by a vapor over a liquid.

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Air Air is made up of four main gases: N 2, O 2, Ar, and CO 2.

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Pressure B-ball

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Problem 3 The basketball was slightly deflated and has a volume of 17cm 3 at 1.7 atm. Joe begins to air it up and he pumps it until there is a pressure of 2.5 atm. What is the new volume?

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Work P 1 x V 1 = P 2 x V 2 17 cm 3 x 1.7 atm = V 2 x 2.5 atm Answer = 11.56 cm 3 P 1 x V 1 = P 2 x V 2 17 cm 3 x 1.7 atm = V 2 x 2.5 atm Answer = 11.56 cm 3

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Problem 4 The reading of a tire-pressure gauge is 35 psi. What is the equivalent pressure in kilopascals?

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Work Answer

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Problem 5 What pressure in atmospheres will 18.6 mol of methane exert when it is compressed in a 12.00-L tank at a temperature of 45°C?

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Work

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Problem 6 A sample of nitrogen monoxide has a volume of 72.6 mL at a temperature of 16°C and a pressure of 104.1 kPa. What volume will the sample occupy at 24°C and 99.3 kPa?

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Work P 1 x V 1 = P 2 x V 2 T 1 T 2 Answer 78.22 ml P 1 x V 1 = P 2 x V 2 T 1 T 2 Answer 78.22 ml

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