15. Calculate the [H⁺] in a solution that has a pH of 9.00.
(A) M
(B) M
(C) M
(D) M
(E) none of these

16. Choose the correct equilibrium expression for the following reaction.  (A) (B) (C) (D) (E) none of these

17. Order the intermolecular forces (dipole-dipole, London dispersion, ionic, and hydrogen- bonding) from weakest to strongest. (A) dipole-dipole, London dispersion, ionic, and hydrogen-bonding (B) London dispersion, dipole-dipole, hydrogen-bonding, and ionic (C) hydrogen-bonding, dipole-dipole, London dispersion, and ionic (D) dipole-dipole, ionic, London dispersion, and hydrogen-bonding (E) London dispersion, ionic, dipole-dipole, and hydrogen-bonding

18. What volume of a 0.687 M solution of CaCl2 contains 1.28 g of solute? (A) 59.6 mL (B) 16.8 mL (C) 1.86 mL (D) 7.92 mL (E) 83.2 mL

19. Which of the following is a conjugate acid/base pair? (A) HCl/OCl– (B) H2SO4/SO42– (C) NH4+/NH3 (D) H3O+/OH– (E) more than one of these

20. Which form of electromagnetic radiation has the longest wavelengths? (A) gamma rays (B) microwaves (C) radio waves (D) infrared radiation (E) x-rays

21. Which of the following best describes an orbital? (A) space where electrons are unlikely to be found in an atom (B) space which may contain electrons, protons, and/or neutrons (C) the space in an atom where an electron is most likely to be found (D) small, walled spheres that contain electrons (E) a single space within an atom that contains all electrons of that atom

22. Based on electronegativities, which of the following would you expect to be most ionic? (A) N2 (B) CaF2 (C) CO2 (D) CH4 (E) CF4

23. A solid acid HX is mixed with water. Two possible solutions can be obtained. Which of the following is true?  (A) In case I, HX is acting like a weak acid, and in case II, HX is acting like a strong acid. (B) In case I, HX is acting like a strong acid, and in case II, HX is acting like a weak acid. (C) In both cases, HX is acting like a strong acid. (D) In both cases, HX is acting like a weak acid. (E) HX is not soluble in water.

24. What is the hybridization of the oxygen atom? (A) sp (B) sp2 (C) sp3 (D) dsp3 (E) d2sp3

25. A salt solution sits in an open beaker. Assuming constant temperature and pressure, the vapor pressure of the solution (A) increases over time (B) decreases over time (C) stays the same over time (D) need to know which salt is in the solution to answer this (E) need to know the temperature and pressure to answer this

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