18. A 0.15 M solution of a weak acid is 3.0% dissociated. The K_a of the acid is calculated to be .
(A) 3.5 × 10^-4
(B)4.2 × 10^-3
(C) 1.4 × 10^-4
(D) 2.4 × 10^-2
(E)3.6 × 10^-3

1. Which of the following statement in regard to unit conversions is correct? (A) One kilogram is equal to 10-9 teragrams. (B)Twenty-five femtograms are equal to 2.5 × 10-14 kilograms. (C) Eight liters are equal to 80 cubic decimeters. (D) 294.5 nm are equal to 2.945 × 107 centimeters. (E)One microliter is equal to 10-6 milliliters.

2. Which one of the following statements is correct? Assume the acids are dissolved in water. (A) The systematic name for H2SO4 is hydrosulfuric acid. (B)The systematic name for ICl is iodine chloride. (C) The systematic name for NH4NO3 is nitrogen tetrahydrogen nitrate. (D) The systematic name for Sr3N2 is tristrontium dinitrogen. (E)The systematic name for KClO3 is potassium chlorite.

3. Which one of the following statements is correct? (A) The systematic name for TeO32- is tellurate ion. (B)The systematic name for Hg2Cl2 is mercury chloride. (C) The systematic name for Mg3(SbO4)2 is magnesium antimonate. (D) The systematic name for GaAs is gallium arsenate. (E)The systematic name for Na2O2 is sodium oxide.

4. A spherical glass container of unknown volume contains helium gas at 25°C and 1.960 atm. When a portion of the helium is withdrawn and adjusted to 1.00 atm at 25°C, it is found to have a volume of 1.75 cm3 . The gas remaining in the first container shows a pressure of 1.710 atm. The volume of the spherical container is L. (A) 7 × 10-4 (B)7 × 10-3 (C) 7 × 10-2 (D) 0.7 (E)7

5. Which one of the following statements is correct? (A) For a 1.0-L container of neon gas at STP, its frequency of collision with the container walls will increase when the temperature is decreased to -50°C. (B)Real gas behaves most ideally when a container volume is relatively small and the gas molecules are moving relatively slow. (C) For separate 1.0-L gaseous samples of H2, Xe, Cl2 and O2 all at STP, H2 has the highest average velocity. (D) For separate 1.0-L gaseous samples of H2 and O2 that all have the same average velocity, O2 has a lower temperature. (E)For separate 1.0-L gaseous samples of H2, Xe, Cl2 and O2 all at STP, Xe has the highest average kinetic energy.

6. The Ostwald process for the commercial production of nitric acid from ammonia and oxygen involves the following steps:  4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) 2NO(g) + O2(g) → 2NO2(g)  3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g). The values of ∆Hf o for some chemicals are the following: NO(g), 90 kJ/mol; H2O(g), -242 kJ/mol; NH3(g), -46 kJ/mol; NO2(g), 34 kJ/mol; HNO3(aq), -207 kJ/mol; H2O(l), -286 kJ/mol. Use the provided values of ∆Hf o to calculate the value of ∆Ho for the last reaction, 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) to be . (A) -908 kJ (B)-112 kJ (C) -140 kJ (D) -826 kJ (E)-220 kJ 

7. Using the Heisenberg uncertainty principle, please calculate the ∆x for a baseball (mass = 145 g) with ∆v = 0.100 m/s to be . (A) 3.64 × 10-4 m (B)5.79 × 10-4 m (C) 3.64 × 10-33 m (D) 5.79 × 10-33 m (E)3.64 × 10-18 m

8. Which of the following statements is correct? (A) Argon has ionization energy higher than bromine. (B)Among Na- , Na, and Na+ , Na- has the smallest radius. (C) For Rb, Na, and Be, the order of increasing atomic size is Rb < Na < Be. (D) In the ground state of mercury, Hg, its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d104p6 5s2 4d10. (E)In the ground state of element 115, Uup, it has 24 electrons occupying atomic orbitals with l = 3.

9. Please use the following data to estimate ∆Hfo for potassium chloride to be__________ kJ/mol. K(s) + (1/2)Cl2(g) → KCl(s); lattice energy, -690. kJ/mol; ionization energy for K, 419 kJ/mol; electron affinity of Cl, -349 kJ/mol; bond energy of Cl2, 239 kJ/mol; ethalpy of sublimation for K, 90. kJ/mol.(A)-161(B)-1085 (C) 161 (D) 1085 (E)-411 

10. Which of the following statements is correct? (A) F2 + has its bond order of 1.5. (B)CN- is paramagnetic. (C) Between O22+ and N2 2+, O2 2+ would most likely gain an electron. (D) The predicted molecular structure and expected hybrid orbitals on the central atom of TeF4 are see-saw and d2 sp 3 , respectively. (E)The predicted molecular structure and expected hybrid orbitals on the central atom of IF4 is trigonal bipyramid and d2 sp 3 , respectively.

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