Chem& 161
General Chemistry w/Lab I

Chemistry& 161, Exam III
Review Outline

In preparation for the third exam you should be sure to review the following:

  1. Terms/Concepts
    1. Units of pressure in “mm Hg”, “torr” and “atm”
    2. Standard temperature and pressure, STP
    3. Molar volume, 22.4 L/mole, at STP
    4. Gas constant, R, with units of “L•atm/mole•K”
    5. The relationship between temperature, average kinetic energy, and the average velocity of gas particles
    6. The relationship between enthalpy changes, DH, and energy changes, DE, in chemical reactions
    7. Exothermic and endothermic
    8. The sign convention (±) for exothermic and endothermic reactions
    9. Standard heats of formation, DHf°
  2. Skills/Background Knowledge
    1. Boyle’s Law
    2. Charles’ Law
    3. Avogadro’s Law
    4. The Ideal Gas Equation, PV = nRT
    5. The Ideal Gas Model
    6. Deviations from the Ideal Gas Model, and the meaning of van der Waal’s constants “a” & “b”
    7. Dalton’s Law of Partial Pressures
  3. Problem solving abilities
    1. Calculations using the Ideal Gas Equation
    2. Calculations using the equation P1V1/ n1T1 = P2V2/ n2T2
    3. Calculations involving the density of gases
    4. Stoichiometric calculations that involve gases
    5. Use Hess’s Law to combine reaction equations to derive a new equation
    6. Calculation of DHrxn from DHf° values
    7. Draw a reaction coordinate (enthalpy) diagram illustrating Hess’s Law, when given the relevant DHrxn values

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