chapter 12 notes student gas laws (1).docx

# chapter 12 notes student gas laws (1).docx - CHAPTER...

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CHAPTER 12-PHYSICAL CHARACTERISTIC OF GASES Kinetic-Greek for moving Kinetic Energy- energy of movement Kinetic theory of gases 1) Gases consist of tiny particles 2) These particles are in constant motion 3) Collision between particles are elastic. There is no loss of Kinetic energy. 4) There are no forces of attraction or repulsion between particles of an ideal gas 5) Ke= m(v²) ⅟₂ Kinetic theory of gases apply to all “ideal gases” or how most gases behave most of the time. Under conditions of low temperature and high pressure attraction between molecules becomes apparent. The kinetic energy is directly proportional to the Kelvin temperatures of gas. All gases at the same temperature have the same amount of Kinetic energy. Formula: Ke= m(v²) ⅟₂ 1) example 1 : You have 1 molecule of H at 300 K and 1 molecule of O at 300 K. a) If the Kinetic energy of O is 6.22 X 10 -21 J what is the kinetic energy of H ? b) What is the velocity of O 2 ? c) What is the velocity of H 2 ? a) KE= 6.22 X 10 -21 J for O . So if H is also at 300 K then H also has a KE= 6.22 X 10 -21 J b) Formula: KE= m(v²) for O ⅟₂ 2 6.22 X 10 -21 J = (32 u)(1.66 × 10 ⅟₂ −27 kg/u)(v²) 234186.7 m 2 /s 2 =v² Now you will take the square root of v² which makes V=484 m/s of O What is the velocity of H ? Since Hydrogen and Oxygen are at the same temperature, they have the same KE. KE= m(v²) for H ⅟₂ 2 6.22 X 10 -21 J = (2 u)(1.66 × 10 ⅟₂ −27 kg/u)(v²) 3746987.9 m 2 /s 2 =v² V=1936 m/s of H

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2) example : You have 1 molecule of He at 300 K and 1 molecule of N at 300 K. a) If the Kinetic energy of He is 6.22 X 10 -21 J what is the kinetic energy of N 2 ? b) What is the velocity of N 2 ? c) What is the velocity of He?
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