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Chemistry > Gas > Flashcards

Gas Flashcards

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1
Q

General properties of gases

A
  • There is a of “free” space in a gas
  • Can be expanded indefinetly
  • Occupy containers uniformly and completely
  • Diffuse and mix rapidly
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2
Q

Gases:

motion

temperature

interaction between particles

collisions

volume

A
  • Motion: random, follow straight lines
  • Temp: proportional to ave KE (kinetic energy)
  • Interaction between particles: no attraction/repulsion
  • Collisions: elastic (no energy lost/gained with container wall)
  • Volume: about 0
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3
Q

Real vs. ideal gases

A
  • Real gases act ideally except in situations where intermolecular forces kick in
  • Ex:
    • O2, N2, CO2 non polar (ideal)
    • H2O polar (real)
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4
Q

Pressure

A

Force divided by the area

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5
Q

Atmospheric pressure

A
  • Measured with barometer
  • mmHg or torr
  • Hg rises in tube until force of Hg balances the force of atmosphere (pushing up)
  • P of Hg pushing down related to
    • Hg density
    • Column height
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6
Q

Standard pressure units

A
  • 101.3 kPa
  • 760 mmHg / torr
  • 1 atm
  • 14.7 psi
  • 29.92 inches
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7
Q

Manometers

A
  • Measures the pressure of a sample gas, man made gas
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8
Q

Pressure vs temperature

A
  • Pressure increase temperature increase
  • P/T=P/T
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9
Q

Volume vs pressure

A
  • Volume increase pressure decrease
  • PV = PV
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10
Q

Volume vs temperature

A
  • Volume increase temperature increase
  • V/T=V/T
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11
Q

Pressure vs number of particles (n)

A
  • Pressure increase n increase
  • Collisions increase
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12
Q

Volume vs number of particles (n)

A
  • Volume increase n increase
  • V/N=V/N
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13
Q

Combined gas law

A
  • PV/T=PV/T
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14
Q

STP

A
  • 0o C = 273.15 K
  • 1 atm
  • 22.4 L = 1 mol
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15
Q

Ideal Gas Law

A
  • PV = nRT
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16
Q

Dalton’s Law

A
  • The total pressure is the sum of the partial pressures
  • The total pressure in a container is the sum of the pressure each gas would exert if it were alone in the container
17
Q

If 2 gases at same temp and same pressure

A
  • Avogadro’s law
  • V/n = V/n
18
Q

If gas at STP

A
  • 22.4 L / mol
19
Q

If gas non-STP

A
  • PV=nRT
20
Q
A

Chemistry (10 decks)

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