28 Which one is always true for a spontaneous process at constant temperature?
(A)ΔSsystem+ΔSsurroundings=q/T
(B)ΔS＞0
(C)ΔS=q/T
(D)ΔSsystem+ΔSsurroundings＞0

(E)ΔS＜q/T

26 What mass of propane needs to be burned to provide 2580 kJ of heat? The standard enthalpy of combustion of propane at 298 K is -2220 kJ·mol⁻¹.(A)25.6 g(B)51.2 g(C)102 g(D)75.9 g(E)37.9 g

27 What type of process is the formation of solid magnesium chloride from gaseous magnesium ions?(A)a state function(B)an adiabatic process(C)an endothermic process(D)an exothermic process(E)not enough information is given to permit an answer

29 The sublimation of solid carbon dioxide is a spontaneous process. Predict the sign (+, -, or 0) of ΔGr°, ΔHr°, and ΔSr°, respectively.(A)-,0,+(B)-,-,-(C)-,+,+(D)0,+,+(E)-,+,-

30 Which of the following is the weakest acid?(A)HNO₃(B)HBr(C)HCl(D)HF(E)HI

31 Which of the following is not a Lewis base(A)OH⁻(B)H₂O(C)SO₃(D)Br⁻(E)NH₃

32 Which of the following has the highest pKa value?(A)HClO(B)HClO₃(C)HClO₄(D)HBrO(E)HIO

33 What is the pH of an aqueous solution containing 0.12 M C₆H₅NH₂ (Kb=4.3×10⁻¹⁰) and 0.018 M C₆H₅NH₃Cl?(A)5.46(B)10.19(C)4.63(D)3.81(E)8.54

34 Which of the following is the strongest reducing agent?(A)Fe²⁺(B)Cr²⁺(C)F⁻(D)H₂(E)Co²⁺

35 A reaction that has a very low activation energy exhibits which of the following characteristics?(A)The rate is very sensitive to temperature.(B)The rate does not change significantly with temperature.(C)It must be second order.(D)It produces a curved Arrhenius plot.(E)It must be first order.

36 Which of the following statements regarding the effect of a catalyst on a reaction is not true?(A)A catalyst has no effect on the equilibrium composition of the reaction.(B)A catalyst provides a lower activation energy for the reaction.(C)When a reaction is catalyzed, both forward and reverse reactions are accelerated.(D)A catalyst speeds up a reaction by providing an alternate pathway for the reaction.(E)When a catalyst speeds up a reaction, the rate law remains the same.

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