1) A) 18 B) 0.55 C) 1.8 D) 5.5 E) 55 2) A) 59 B) 2.4 C) 1.8

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1 Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A gas at a pressure of 10.0 Pa exerts a force of N on an area of ) A) 18 B) 0.55 C) 1.8 D) 5.5 E) 55 2) A gas at a pressure of 325 torr exerts a force of N on an area of ) A) 59 B) 2.4 C) 1.8 D) E) 2.4 3) A pressure of 1.00 atm is the same as a pressure of of mmhg. 3) A) B) 193 C) 101 D) E) ) A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 12.2 cm. Atmospheric pressure was 783 mmhg. The pressure of the argon in the container was mmhg. A) 882 B) 661 C) 771 D) 795 E) 122 5) A gas vessel is attached to an open-end manometer containing a nonvolatile liquid of density g/ml as shown below. 4) 5) The difference in heights of the liquid in the two sides of the manometer is 43.4 cm when the atmospheric pressure is 755 mmhg. Given that the density of mercury is 13.6 g/ml, the pressure of the enclosed gas is atm. A) B) C) D) E) ) A sample of gas (24.2 g) initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant temperature. After the compression, the gas pressure was atm. A) 8.00 B) 16.0 C) 4.00 D) 2.00 E) ) A balloon originally had a volume of 4.39 L at 44 C and a pressure of 729 torr. The balloon must be cooled to C to reduce its volume to 3.78 L (at constant pressure). A) 38 B) 273 C) 72.9 D) 546 E) 0 6) 7) 8) If g of a gas occupies 10.0 L at STP, g of the gas will occupy L at STP. 8) A) 50.8 B) 12.9 C) 5.08 D) 25.5 E) ) A gas vessel is attached to an open-end manometer filled with a nonvolatile liquid of density g/ml as shown below. The differenc e in heights of the liquid in

2 the two sides of the manome ter is 32.3 cm when the atmosph eric pressure is 765 mmhg. Given that the density of mercury is 13.6 g/ml, the pressure of the enclosed gas is atm. 9) A) B) 1.08 C) 1.01 D) 1.04 E) ) A sample of an ideal gas (3.00 L) in a closed container at 25.0 C and 76.0 torr is heated to 300 C. The pressure of the gas at this temperature is torr. A) 76.5 B) 39.5 C) 146 D) 912 E) ) 11) The molecular weight of a gas that has a density of 5.75 g/l at STP is g/mol. 11) A) 3.90 B) 141 C) 1.73 D) 129 E) ) The reaction of 50 ml of gas with 150 ml of gas to form ammonia via the equation: 12) will produce ml of ammonia if pressure and temperature are kept constant. A) 50 B) 100 C) 250 D) 200 E) ) The density of chlorine ( ) gas at 25 C and 60. kpa is g/l. 13) A) 4.9 B) 0.58 C) 0.86 D) 1.7 E) 20

3 14) CO (5.00 g) and C (5.00 g) were placed in a ml container at 50.0 C. The partial pressure of CO in the container was atm. A) 4.02 B) 10.3 C) 1.60 D) E) ) Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 14) 15) 2Na (s) 2Na (s) + 3 (g). What mass (g) of Na is required to provide 40.0 L of at 25.0 C and 763 torr? A) 1.64 B) 71.1 C) 160 D) 1.09 E) ) The mass of nitrogen dioxide contained in a 4.32 L vessel at 48 C and Pa is g. 16) A) 70.5 B) 5.35 C) 9.46 D) 53.5 E) ) A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of HF to the rate of effusion of HBr is. A) B) C) 4.04 D) 16.3 E) ) 18) The molar volume of a gas at STP is L. 18) A) 22.4 B) C) 14.7 D) E) ) Of the following, is a correct statement of Boyle's law. 19) A) B) C) D) PV E) 20) Of the following gases, will have the greatest rate of effusion at a given temperature. 20) A) N B) HCl C) Ar D) HBr E) C 21) Which one of the following is a valid statement of Avogadro's law? 21) A) B) V P C) V n D) PV E)

4 22) Of the following, is a valid statement of Charles' law. 22) A) B) V P C) V n D) E) PV 23) For a molecule with the formula A the molecular shape is. 23) A) linear or T-shaped B) linear or bent C) T-shaped D) trigonal planar E) linear or trigonal planar 24) According to VSEPR theory, if there are five electron domains in the valence shell of an atom, they will be arranged in a(n) geometry. A) trigonal bipyramidal B) trigonal planar C) linear D) tetrahedral E) octahedral 24) 25) The molecular geometry of is square planar. 25) A) Xe B) C C) Xe D) P E) I 26) The molecular geometry of the CH molecule is. 26) A) T-shaped B) trigonal planar C) bent D) tetrahedral E) trigonal pyramidal 27) The Cl-Si-Cl bond angle in the Si molecule is approximately. 27) A) B) 60 C) 120 D) 180 E) 90 28) The O-S-O bond angle in S is slightly less than. 28) A) 90 B) C) 60 D) 120 E) ) The electron-domain geometry of a sulfur-centered compound is trigonal bipyramidal. The hybridization of the central nitrogen atom is. A) B) sp C) D) d E) 30) The hybridization of orbitals on the central atom in a molecule is sp. The electron-domain geometry around this central atom is. A) octahedral B) tetrahedral C) trigonal planar 29) 30)

5 D) trigonal bipyramidal E) linear 31) The electron-domain geometry of the As ion is octahedral. The hybrid orbitals used by the As atom for bonding are orbitals. A) B) C) D) d E) 31) 32) There are σ and π bonds in the C C C molecule. 32) A) 2, 2 B) 6, 2 C) 2, 6 D) 6, 4 E) 4, 2 33) There is/are π bond(s) in the molecule below. 33) A) 0 B) 1 C) 2 D) 4 E) 16 34) The molecular geometry of the Br ion is. 34) A) tetrahedral B) trigonal planar C) trigonal pyramidal D) T-shaped E) bent 35) How many equivalent resonance structures can be drawn for the molecule of S without having to violate the octet rule on the sulfur atom? A) 2 B) 3 C) 1 D) 5 E) 4 36) Using the table of average bond energies below, the ΔH for the reaction is kj. 35) 36) H-C C-H (g) + H-I (g) C CHI (g) Bond: C C C=C H-I C-I C-H D (kj/mol): A) -506 B) -129 C) -931 D) +129 E) +506 The diagram below is the Born-huber cycle for the formation of crystalline potassium fluoride.

6 37) Which energy change corresponds to the electron affinity of fluorine? 37) A) 5 B) 2 C) 4 D) 6 E) 1 38) Which energy change corresponds to the first ionization energy of potassium? 38) A) 5 B) 2 C) 4 D) 6 E) 3 39) Using the Born-Haber cycle, the Δ of KBr is equal to. 39) A) Δ [K (g)] - Δ [Br (g)] + (K) - E(Br) + Δ B) Δ [K (g)] + Δ [Br (g)] + (K) + E(Br) + Δ C) Δ [K (g)] + Δ [Br (g)] + (K) + E(Br) - Δ D) Δ [K (g)] - Δ [Br (g)] - (K) - E(Br) - Δ E) Δ [K (g)] + Δ [Br (g)] - - E(Br) + Δ 40) Using the table of average bond energies below, the H for the reaction is kj. 40) C O (g) + 2 (g) C-O-H (g) Bond: C-O C=O C O C-H H-H O-H D (kj/mol): A) -116 B) -276 C) +276 D) +735 E) ) How many equivalent resonance forms can be drawn for C - (carbon is the central atom)? 41) A) 2 B) 3 C) 1 D) 0 E) 4 42) Of the molecules below, the bond in is the most polar. 42) A) HI B) HCl C) HF D) HBr E) 43) Of the bonds C-N, C N, and C N, the C-N bond is. 43) A) weakest/shortest B) intermediate in both strength and length C) weakest/longest D) strongest/longest E) strongest/shortest 44) The formal charge on sulfur in S is, where the Lewis structure of the ion is:

7 44) A) 0 B) -4 C) +2 D) +4 E) -2 45) The formal charge on carbon in the molecule below is. 45) A) +3 B) +1 C) -1 D) 0 E) +2 46) Given the electronegativities below, which covalent single bond is most polar? Element: H C N O Electronegativity: A) O-N B) C-H C) N-H D) O-C E) O-H 46) 47) A double bond consists of pairs of electrons shared between two atoms. 47) A) 1 B) 2 C) 3 D) 4 E) 6 48) A covalent bond between the same two atoms is the longest. 48) A) double B) single C) triple D) They are all the same length. E) strong 49) Which one of the following species has the electron configuration [Ar]3? 49) A) B) C) D) E) 50) For a given arrangement of ions, the lattice energy increases as ionic radius and as ionic charge. A) decreases, decreases B) decreases, increases C) increases, increases D) increases, decreases E) This cannot be predicted. 50) 51) How many unpaired electrons are there in an ion? 51) A) 0 B) 1 C) 2 D) 3 E) This cannot be predicted. 52) There are paired and unpaired electrons in the Lewis symbol for a phosphorus atom. A) 2, 3 B) 4, 3 C) 2, 4 D) 0, 3 E) 4, 2 52)

8 53) The bond angle marked a in the following molecule is about. 53) A) B) 180 C) 120 D) 90 E) 60 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 54) Draw a Lewis Structure of actelyne (C2H2). Now draw the sigma & pi bonds based on 54) the hybridization of the orbitals. (Balloon diagrams)

9 1) E 2) B 3) D 4) E 5) D 6) B 7) E 8) D 9) D 10) C 11) D 12) B 13) D 14) E 15) B 16) E 17) E 18) A 19) D 20) E 21) C 22) D 23) B 24) A 25) C 26) D

10 27) A 28) D 29) D 30) E 31) E 32) B 33) C 34) C 35) B 36) B 37) C 38) E 39) C 40) A 41) B 42) C 43) C 44) A 45) D 46) E 47) B 48) B 49) C 50) B 51) A 52) A

11 53) C 54) See page 339 in book

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