Chem 1 Exam Basic Skills Section 1. What is the chemical formula for aluminum nitrate? a) Al(N ) b) AlN c) Al(N ) d) Al (N ) e) Al (N ). What are the spectator ions in the solution after the complete neutralization reaction occurs when mixing the strong acid HN (aq) and the strong base Ba(H) (aq)? a) H + (aq), N (aq), Ba + (aq), and H (aq) b) H (aq) and Ba + (aq) c) H + (aq) and H (aq) d) H (aq) and N (aq) e) Ba + (aq) and N (aq). When 41.00 ml of a stock solution containing 0.65 M Al is diluted to 141.00 ml, how many moles of Al + (aq) are in the new solution? a) 0.01 mol b) 0.067 mol c) 0.0800 mol d) 0.189 mol e) 0.567 mol 4. Which of these ions has the largest radius? a) b) Ca + c) S d) K + e) They all have the same radius. 5. What is the proper electron configuration for a 5 Br atom? a) 1s s p 6 s p 6 4s d 10 4p 5 b) 1s s p 6 s p 6 d 10 4p 6 5s 1 c) 1s s p 6 s p 6 4s d 8 4p 6 5s 1 d) 1s s p 8 s p 8 d 10 4s 4p 5 e) 1s s p 4 s p 6 d 8 4s 4 f 5 1
6. Which of the following represents a proper Lewis structure for N? A. N B. N C. N D. N E. N End of Basic Skills Section 7. Which point on the phase diagram below corresponds to the critical point? P #1 # a) 1 b) c) d) 4 e) 5 # T
8. Iodine (I ) is a crystalline solid at room temperature. This solid can best be described as a) an ionic solid b) a molecular solid c) a network covalent solid d) a metallic solid e) an amorphous solid 9. What is the molality of KBr in a solution made by dissolving.1g of KBr in 897g of water? a).46m b) 0.0167m c) 0.007m d).46 10 m e).07 10 5 m 10. The enthalpy of fusion of water is 6.0 kj/mol and the heat capacity is 75 J/mol C. How many kj of heat would it take to convert 50g of ice at 0 C to liquid water at C? a) 4.6kJ b) 17kJ c) 1kJ d) 78kJ e) 4600kJ 11. Which one of the following would have hydrogen bonding contributing to its intermolecular forces? a) b) c) C C CH CF H H CH H N H d) H e) CH C F H F F C C F F
1. 0.5 moles of a salt is dissolved in a kg of water. The solution freezes at 4.65 C. Which one of the following salts could produce the solution with this freezing point? K f for water = 1.86 C/m a) NaN b) Ca c) K C d) Li e) Fe (S 4 ) 1. The equilibrium constant at 100 C for the following reaction is.19 10 10. C (g) C(g) + (g) The equilibrium mixture should be a) mostly C (g) b) mostly C (g) c) mostly (g) d) an equal mixture of C(g) and (g) with almost no C (g) e) There is not enough information to determine anything about the equilibrium mixture. 14. What is the equilibrium constant expression for the following reaction? S (g) S (g) + S(s) a) b) c) (d) (e) [ S ] K c = [ S ] [ S] [ S ] [ S ] K c = [ S ] [ S ] K c = [ S ] [ S ] K c = [ S ] [ S] K c = [ S ] 4
15. The value of K C for the following reaction is 0.5. S (g) + N (g) S (g) + N(g) What is the value of Kc for the reaction shown below? S (g) + N (g) S (g) + N(g) a) 0.50 b) 0.06 c) 0.15 d) 0.5 e) 4.0 16. If 1.00 mole of C 6 H 6 and.00 moles of H are put into a 00L vessel and allowed to reach equilibrium after reacting as follows, the resulting mixture contains 0.17mol of C 6 H 1. What is the equilibrium amount of H in moles? a) 0.0457 mol b) 0.17 mol c) 0.411 mol d).59 mol e).86 mol C 6 H 6 (g) + H (g) C 6 H 1 (g) 17. A.1L vessel contains 6.89 10 1 mol of C, 9.78 10 11 mol of C and 8.45 10 15 mol of. The equilibrium constant for the following reaction is K C = 1. 10 1.Which one of the following statements is true? C (g) C(g) + (g) a) The system is at equilibrium. b) The system is not at equilibrium. [C] and [ ] must increase and [C ] must decrease for the system to reach equilibrium. c) The system is not at equilibrium. [C] and [ ] must decrease and [C ] must increase for the system to reach equilibrium. d) The system is not at equilibrium. More C(g) must be present for the system to be at equilibrium. e) The system is not at equilibrium. There is no way for it to get to equilibrium at this temperature. 5
18. The following reaction is endothermic. Which of the following actions will bring about an increase in the production of C (g) from CaC (s)? CaC (s) Ca(s) + C (g) a) adding more CaC to the reaction mixture. b) adding more Ca to the reaction mixture. c) adding more C to the reaction mixture. d) increasing the temperature of the reaction mixture. e) increasing the pressure of the reaction mixture. 19. Determine the equilibrium constant (K C ) for the following reaction if the initial concentration of N 4 (g) is 0.0400M and the equilibrium concentration of N 4 (g) is 0.0055M. (Assume that there is no N (g) present initially.) N 4 (g) N (g) a) 0.87 b) 1.15 c) 0. d) 0.0 e) 1 0..5 mol of He occupies 57.9L at 00K and 1.00 atm. What is its volume at 4K and 1.00 atm? a) 0.709L b) 41.1 L c) 81.6L d) 1.41L e) 57.9 L 1. What volume of H gas is required to react with excess magnesium metal to produce 6.8L of hydrogen gas at.19 atm and 5 C? a) 1.18L b).19l c) 4.8L d) 6.8L e) 1.6L 6
. A 1.L vessel containing N (g), Ar(g), He(g) and Ne(g) has a total pressure of 987 torr. If the partial pressures of nitrogen, argon, and helium are 44 torr, 486 torr, and 18 torr respectively, what is the partial pressure of neon in the vessel? a) 4.4 torr b) 51 torr c) 19.4 torr d) 9 torr e) it cannot be determined unless the temperature is known.. The following reaction that produces chlorine atoms occurs in the upper atmosphere. If the enthalpy needed to break the C bond is 8kJ/mole, determine the wavelength of light absorbed in this process. a) 47 nm b) 44 nm c) 65 nm d) 47 nm e) 494 nm CF (g) + hν CF (g) + (g) 4. There are different gases in three connected, but separate containers, under the conditions given below. Which one of the following statements about the gases in the different containers is true? He Ar N Volume 1.5L 0.5L 1.0L Pressure.5atm 0.5atm 1.0atm Temperature 98K 98K 98K a) He has the greatest average kinetic energy. b) N has the smallest rms speed. c) Ar undergoes more collisions than the other two gases. d) All of these statements (a, b, and c) are true. e) None of these statements are true. 5. The atmosphere is primarily composed of N (g) and (g). If the mole fractions of these gases are 0.80 and 0.0 respectively, what is atmospheric pressure in a region where the partial pressure of (g) is 11 mm Hg? a).4 mm Hg b) 89.6 mm Hg c) 140 mm Hg d) 560 mm Hg e) 75 mm Hg 7
6. The solubility of N gas in water will increase if the temperature of the solution increases. 7. Carbon tetrachloride (C 4 ) will be more soluble in benzene (C 6 H 6 ) than ammonia. (NH ). 8. At 5 C, the average molecular speed of C is higher than the average molecular speed of N. 9. A real gas is most likely to behave ideally at high temperatures and low pressures. 0. Carbon dioxide produced in the combustion of hydrocarbons (fuels) is a greenhouse gas. 8
Answer Key 1. a. e. b 4. c 5. a 6. a 7. e 8. b 9. c (1/ credit for e) 10. c (1/4 credit for a, b) 11. c 1. e 1. a 14. d 15. b 16. d (1/ credit for c) 17. c 18. d 19. a 0. c 1. e. d. c 4. e 5. d 6. b 7. a 8. b 9. a 0. a 9