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Practice+Final chem 107A

Practice+Final chem 107A - 1 If the following statements...

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1.) If the following statements are True, Place a T in the line before the statement. If False, place an F. When heat is absorbed by the system during a process, the sign of q is negative. A system undergoing a reversible process may be regarded as being at equilibrium. The energy of an isolated system is constant. When water freezes spontaneously, its entropy must increase. The entropy of mixing two gases increases as the concentration approaches a mole fraction of 1.0. For a spontaneous process at constant T and P , ± G ° must be negative. The chemical potential is the same as its partial molar Gibbs energy. For an ideal solution, μ A is smaller than μ A ° upon adding a solute B To determine a protein's molecular weight, freezing point depression is more accurate than measuring its osmotic pressure. The biochemist's standard state differs from a physical chemist's in that the concentration of all products and reactants is 10 -7 M . The standard state EMF of a redox reaction ( E °) does not change with temperature. According to Le Chatelier's principle, adding more reactant in the following reaction will help shift the equilibrium towards more product formation in a closed reaction vessel. CaCO 3 (s) ± CaO (s) + CO 2 (g) At equilibrium, ± r G ° = 0. Electrons travel through the salt bridge in a Daniell cell to complete the circuit.
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For questions 2 - 10, circle the correct answer. 2.) The equation below that best describes the first law of thermodynamics is: a.) ± H = C P ± T b.) ± U = C V ± T c.) ± H = ± U + P ± V d.) ± U = q + w e.) ± G = ± H - T ± S 3.) The statement below that best describes the second law of thermodynamics is: a.) The entropy of vaporization is 88 kJ K -1 mol -1 b.) Mixed second partial derivatives are independent of the order in which the derivatives are taken c.) At equilibrium, the entropy of an isolated system reaches a maximum d.) A spontaneous process is characterized by a decrease in entropy between the initial and final states e.) The entropy change between any two states of a system requires calculation along an irreversible path between two states
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