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The Gas Laws

The Gas Laws. Boyle’s Law Charles’ Law Gay-Lussac’s Law Combined Gas Law. COPY THIS CHART!!!!. Units used to describe gas samples:. Volume Liter (L) Milliliter (mL) 1000 mL = 1L. Temperature Kelvin ONLY. Pressure Atmosphere (atm) Kilopascale (kPa) 1 atm = 101.3 kPa

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The Gas Laws

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  1. The Gas Laws • Boyle’s Law • Charles’ Law • Gay-Lussac’s Law • Combined Gas Law

  2. COPY THIS CHART!!!!

  3. Units used to describe gas samples: Volume Liter (L) Milliliter (mL) 1000 mL = 1L Temperature Kelvin ONLY Pressure Atmosphere (atm) Kilopascale (kPa) 1 atm = 101.3 kPa 1 atm = 760 mm Hg 1 atm = 760 torr

  4. Boyle’s Law Boyle’s Law – at constant temperature, the volume of the gas increases as the pressure decreases. The volume of the gas decreases and the pressure increases. V↑ P↓ Volume L P1V1 = P2V2 If you squeeze a gas sample, you make its volume smaller. Pressure (kPa)

  5. Now . . . a container where the volume can change (syringe) Moveable piston ↕ Same temperature Volume is 100 mL at 25°C Volume is 50 mL at 25°C In which system is the pressure higher? (Which has the greater number of collisions with the walls and each other?)

  6. Boyle’s Law—WATCH THIS https://safeshare.tv/x/ss5b9936b500d30#

  7. Charles’ Law Charles’ Law – at a constant pressure, the volume of a gas increases as the temperature of the gas increases and the volume decreases when the temperature decreases. V1V2 T1 T2 = • increase AKE • increase the speed of the particles • the walls of a flexible container expand – think of hot air balloons! Volume L Temperature (K)

  8. A B Steel cylinder (2L) contains 500 molecules of O2 at 400 K Steel cylinder (2L) contains 500 molecules of O2 at 800 K • In which system do the O2 molecules have the highest average kinetic energy? • In which system will the particles collide with the container walls with the greatest force? • In which system is the pressure higher? B B B

  9. Charles’ Law—WATCH THIS! https://safeshare.tv/x/ss5b9936e1da6fb#

  10. Gay-Lussac’s Law Gay-Lussac’s Law – the pressure of a gas is directly proportional to its absolute temperature at a constant volume. P1P2 T1 T2 Pressure (atm) = Temperature (K)

  11. To remember how these work. . . P T V Think “Public Tele Vision”

  12. Gay-Lussac’s Law—WATCH THIS! https://safeshare.tv/x/ss5b9936feaebce#

  13. To remember which constants go with which law . . . Boyle’s Law – Temperature is constant Charles’ Law – Pressure is constant Gay-Lussac’s Law – Volume is constant BLT Cheese Pizza Green Veggies

  14. Combined Gas Law P1V1P2V2 T1 T2 = The equation is found on Table T. Note that all temperatures must be in Kelvin!

  15. Combined Gas Law-WATCH THIS! https://safeshare.tv/x/ss5b99373c95590#

  16. MORE VIDEOS https://safeshare.tv/x/ss5b99376aeafe9# https://safeshare.tv/x/_EWd0DuN43E#

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