Скачать презентацию Lesson 12 1 Gases Density density Скачать презентацию Lesson 12 1 Gases Density density

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Lesson 12. 1 Gases Lesson 12. 1 Gases

Density • density pepsi vs diet pepsi 3. 5 min • volume of a Density • density pepsi vs diet pepsi 3. 5 min • volume of a marble • density animation

What are the main physical properties of gases? • Gases assume the volume and What are the main physical properties of gases? • Gases assume the volume and shape of the container. • Gases are most compressible of states of matter. • Gases will mix evenly and completely when confined to same container. • Gases have much lower densities than liquids and solids.

List the Gases Periodic Table in back of textbook Why diatomic? List the Gases Periodic Table in back of textbook Why diatomic?

Noble Gases • Single atoms • Complete outer valance shell • Octet rule is Noble Gases • Single atoms • Complete outer valance shell • Octet rule is satisfied

Kinetic Molecular Theory • Gases have similar physical properties • Little variation in behavior Kinetic Molecular Theory • Gases have similar physical properties • Little variation in behavior • Kinetic = Greek word “to move” Particles in motion • Particles are small – Lots of empty space – No significant attraction or repulsion forces • Constant random motion

Kinetic Energy = ½ mv 2 • Molecules travel in a straight line • Kinetic Energy = ½ mv 2 • Molecules travel in a straight line • Hit a wall or another molecule then Energy is transferred – no energy is lost • m is mass • v is velocity (speed and direction)

Compression and Expansion Compression and Expansion

Diffusion and Effusion • Diffusion – smell cooking throughout the house • Effusion – Diffusion and Effusion • Diffusion – smell cooking throughout the house • Effusion – gas escapes from a small hole different rates depends on size • Smaller particles travel faster

Diffusion Ratio NH 3 or HCl Back to molar mass! NH 3 36. 5 Diffusion Ratio NH 3 or HCl Back to molar mass! NH 3 36. 5 g/mol and HCl 17. 0 g/mol

Find Diffusion Ratio N 2 and Ne CO and CO 2 Find Diffusion Ratio N 2 and Ne CO and CO 2

Pressure Think about it Walk on deep snow with boots, snow shoes, skis. Which Pressure Think about it Walk on deep snow with boots, snow shoes, skis. Which sink the most? Why?

Pressure = force / unit of area The pressure in car or bicycle tires Pressure = force / unit of area The pressure in car or bicycle tires is measured in pounds per square inches. Car tires 26 -30 lb/sq. in. Bicycle tires 40 -60/sq. in.

Who will wear out the carpet first? 125 lbs woman wearing high heels? Or, Who will wear out the carpet first? 125 lbs woman wearing high heels? Or, same woman wearing flats? Why?

Barometer or Manometer • Instruments that measure pressure Barometer or Manometer • Instruments that measure pressure

Units of Measure Units of Measure

Dalton’s Law Partial Pressure Ptotal = P 1 + P 2 + P 3 Dalton’s Law Partial Pressure Ptotal = P 1 + P 2 + P 3 +. . . + Pn O 2 + CO 2 + N 2 PCO 2 = 0. 70 PN 2 = 0. 12 Ptotal = 0. 97 atm Find PO 2 = 0. 97 – 0. 70 – 0. 12 = 0. 15 atm

Textbook page 409 # 4, 5, 6 Textbook page 409 # 4, 5, 6

p. 409 # 4, 5, 6 4. PH 2 = 161 mm. Hg 5. p. 409 # 4, 5, 6 4. PH 2 = 161 mm. Hg 5. Ptotal = 13. 78 k. Pa 6. PCO 2 = 10. 2 k. Pa

Explain how a person can break a board, like in Karate? Explain how a person can break a board, like in Karate?