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I Describing Properties Of Gases
 

I Describing Properties Of Gases

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    I Describing Properties Of Gases I Describing Properties Of Gases Presentation Transcript

    • I. Describing Properties of Gases
    • I. Describing Properties of Gases (don’t copy)
      Objectives:
      know the relationship between pressure and volume of a gas.
      know the relationship between temperature and volume of a gas.
      know the relationship between pressure and temperature of a gas.
      know the relationship between moles of a gas and volume.
    • I. Describing Properties of Gases
      Four properties are needed to completely describe the state or condition of a sample of a gas:
      pressure
      temperature
      volume
      moles
      When any one property of a sample of a gas is changed, other properties change in a predictable way.
    • I. Describing Properties of Gases
      Pressure
      All gases exert pressure on their surroundings.
      pressure – force per unit area
      Pressure is commonly measured in units of atmospheres (atm), millimeters of mercury (mmHg), and Pascals (Pa).
      Conversion Factors
      1 atm = 760 mmHg
      1 atm = 760 torr
      1 torr = 1 mmHg
      1 atm = 101325 Pa
      1 atm = 14.69 psi
    • I. Describing Properties of Gases
      Boyle’s Law
      P1V1 = P2V2
      Interpretation
      describes relationship between pressure and volume
      pressure and volume are inversely proportional
      as one increases the other decreases
    • I. Describing Properties of Gases
      Charles’s Law
      V1 = V2
      T1 T2
      Interpretation
      describes relationship between volume and temperature
      temperature and volume are directly proportional
      as one increases the other increases
    • I. Describing Properties of Gases
      Gay-Lussac’s Law
      P1 = P2
      T1 T2
      Interpretation
      describes relationship between pressure and temperature
      pressure and temperature are directly proportional
      as one increases the other increases
    • I. Describing Properties of Gases
      Avogadro’s Law
      V1 = V2
      n1 n2
      n – is the symbol for amount of gas in units of moles
      Interpretation
      describes relationship between moles of gas and volume
      moles and volume are directly proportional
      as one increases the other increases