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[Exam Tutorial] CHMA11 2013 Midterm Questions

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University of Toronto Scarborough

CHMA 11 Mid Term Test- Yellow Multiple Choice. Choose the one alternative that best completes he statement or answers the question. 1) What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 128 pm? a) 362 pm b) 1020 pm c) 512 pm d) 181pm - 2) Which of the following best describes ClF ? 2t has a molecular geometry that is A) Nonlinear with no lone pairs on the Cl atom B) linear with no lone pairs on the Cl atom c) Linear with lone pairs on the Cl atom. D) nonlinear with lone pairs on the Cl atom ∆ 3) Determine H Vapfor a compound that has measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K a) 13 kJ/mol b) 79 kJ/mol c) 41 kJ/mol d) 34kJ/mol E)24kJ/mol 4) What are the units of k I the following rate law? Rate = k[X][Y]1/2 1/2 -1 -1 -1/2 -1/2 -1 -1-1 a) M s B) M S c) M/s D) M s E) M S 5) At a certain temperature the equilibrium constant , K eqcals 0.11 for the reaction: 2 ICl(g) ↔ I (g) + Cl (g) 2 2 What is the equilibrium concentration of ICl when 0.45 mol of I a2d 0.45 mol of Cl are2initially mixed in a 2.0-L flask and the mixture is allowed to come to equilibrium? A) 0.34 M b)0.17M c) 0.14M d) 0.27M 6) What data should be plotted to show that experimental concentration data fits a first- order reaction? a) Ln(k) vs E a b) Ln(k) vs 1/T c) Ln[reactant] vs. time d) 1/[reactant] vs time e) [reactant] vs time o -4 7) The henry’s law constant for helium gas in water at 30 C is 3.70 x 10 M/atm. When the partial pressure of helium above a sample of water is 0.650 atm, the concentration of helium in the water is __________ M. a) 1.30 B) 3.70 x 10 -4 c) 1.76 x 10 3 D) 2.41 x 10 -4 e) 5.69 x 10-4 8) How much energy is required to vaporize 98.6 g of ethanol (C H OH 2W 5 46.0 g/mol) Δ at its boiling point, if its H vapis 40.5 KJ/mol? a) 18.9 KJ B) 11.5 kJ c) 86.7 kJ D) 52.8KJ e) 39.9KJ 9) The equilibrium constant is equal to 5.00 at 1300 K for the reaction: ↔ 2SO (2) + O (2) 2SO (3). If initial concentrations are [SO2] = 6.00 M [O2] = 0.45 M, and [SO ]3= 9.00 M, the system is a) Not at equilibrium and will shift to the right to achieve an equilibrium state. b) Not a equilibrium and will remain in an equilibrated state. c) Not at equilibrium and will shift to the left to achieve an equilibrium state. d) At equilibriums 10)The decomposition of dinitrogen pentoxide is described by the chemical equation 2N 2 5g) → 4NO (2) + O (2) If the rate of appearance of NO i2 equal to -.560 mol/min at a particular moment, what is the rate of appearance of O a2 that moment? A) 0.280 mol/min B) 2.24 mol/min C) 1.12 mol/min D) 0.140 mol/min 11)The aquation of trist(1,10-phenanthroline) iron(ii) acid ___________ Fe(phen) 32++ 3H O3+ 3H O 2 → Fe(H 2)6 + 3phenH + If the activation energy, E , 12a kJ/ mol and the rate constant at 30 C is 9.8 x 10 min , -3 -1 what is the rate constant at 35 C? o 1 -1 -2 -1 -3 -1 2 -1 a) 4.5 x10 min b) 2.2 x 10 min c) 4.4 x 10 min D) 2.3 x 10 min 12)Choose the substance with the lowest surface tension. a) C H 6 6 b) CH CH 3H CH2 2 3 c) (CH ) CO 3 2 d) CH SH 3 e) H O 2 13)Determine the rate law and the value of K for the following reaction using the data provided. 2- - → 2- - S 2 (8q) + 3I (aq) 2SO 4 (g) + I3(aq) [S O ] (M) [I] (M) Initial Rate (M S )1 -1 2 8 I I 0.30 0.42 4.
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