2. Choose the electron dot formula that most accurately describes the bonding in CS₂.
(A)
(B)
(C)
(D)
(E)

1. Iron oxide can be reduced to iron by a reaction with carbon to form carbon monoxide Fe2O3(s) +3C(s) → 2Fe(s) + 3CO(g) If 95.0 grams of iron oxide is reacted with excess carbon yields 63.0 g of iron, what is the percent yield of this reaction? (A) 12% (B) 60% (C) 75% (D) 85% (E) 95%

3. An electron in a 10.0-nm one-dimensional box is excited from the ground state into a higher energy state by absorbing a photon with wavelength 1.374 x m. Determine the final energy level for this transition. (A) n=2 (B)n = 3 (C)n = 4 (D) n = 5 (E)n = 6

4. For H2, which of the following statements is not true? (A) Its HOMO is the orbital. (B) Its LUMO is the orbital. (C) Its lowest-energy excited state electron configuration is (σ1s)¹(σ18*)1. (D) The bond order for Its lowest-energy excited state is 1. (E) Its ground state electron configuration is (σ1s)2.

5. Which of the following statements is(are) true? I. An excited atom can return to its ground state by absorbing electromagnetic radiation.  II. The energy of an atom is increased when electromagnetic radiation is emitted from it.  III. The energy of electromagnetic radiation increases as its frequency increases. IV. An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency. V. The frequency and wavelength of electromagnetic radiation are inversely proportional to each other. (A) II, III, IV (B) III, V (C) I, II, III (D) I, II, IV (E) III, IV, V

6. Rank from smallest to largest in terms of atom/ionic radii. (A) (B) (C)(D) (E)

7. Which of the following statements is true concerning ideal gases? (A) The temperature of the gas sample is directly related to the average velocity of the gas particles. (B) At STP, 1.0 L of Ar(g) contains about twice the number of atoms as 1.0 L of Ne(g) because the molar mass of Ar is about twice that of Ne. (C)A gas exerts pressure as a result of the collisions of the gas molecules with the walls of the container. (D) The gas particles in a sample exert attraction on one another. (E) All of these statements are false.

8. A Lewis dot structure for benzene, CH would give two equivalent resonance structures for this cyclic molecule with alternating single and double bonds A combined LCAO and MO picture for the bonding of the carbon atoms in benzene would be (A) 10(Csp²-Csp²) bonds between each C atom, and 3π MO delocalized over the C's (B) 20(Csp3-Csp³) bonds between each C atom, and 1 7π MO delocalized over the C's (C) 10(Csp³ Csp³) bonds between each C atom, and 1tMO delocalized over the C's (D)1(Csp2-Csp²) bonds between each C atom, and 21 MO delocalized over theC's (E) 30(C2p-C2p) bonds between each C atom 

9. Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is 5.144°C. Pure benzene freezes at 5.444°C and has a value for the molal freezing-point-depression constant of of 5.12°C/m. What is the molar mass of thyroxine? (A) 7770 g/mol (B) 777 g/mol (C) 2330 g/mol (D) 285 g/mol (E) 3760 g/mol

10. Which of the following shows these molecules in order from most polar to least polar? (A) CH4＞ CF2Cl2 ＞ CF2H2 ＞ CC14 ＞ CCl2H2 (B) CH4 ＞ CF2H2 ＞ CF2Cl2 ＞ CC14＞ CC2H2 (C) CF2H2 ＞ CCl2H2 ＞ CF2Cl2 ＞ CH4 = CC14 (D) CF2Cl2 ＞ CF2H2 ＞ CCl2H2 ＞ CH4 = CC14 (E) CF2Cl2 ＞ CF2H2 ＞ CCl4 ＞ CCl2H2 ＞ CH4

11. Which of the following statements are true about starch? I. The monomers are fructose and glucose. II. The monomer is glucose. III. It is the main carbohydrate reservoir in plants. IV. It is the main carbohydrate reservoir in animals. V. It is an addition polymer. VI. It is a condensation polymer. (A) I, III, IV, V (B) II, IV, VI (C) II, III, VI (D) I, III, V (E) I, IV, V

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