CHEM 13 NEWS EXAM Answers

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1 HM 13 NWS XM nswers 1 Which of the following is most similar in its properties to element 12? element 4 element 10 4 Of the following compounds, which one contains nitrogen in an oxidation state of +5? * NO 2 F N 2 O 3 element 11 NH 4 l element 13 * element 20 Mg 3 N 2 KNO 2 2 ach of two identical containers holds one mole of gas, all at the same temperature. 5 To which process does the term sublimation refer? solid to liquid H 4 SO 2 liquid to solid Which of following statements is true? The SO 2 gas has a higher pressure. The H 4 gas has a greater density. The SO 2 molecules move, on average, faster than the H 4 molecules. * eviations from ideal gas behaviour are smaller for the H 4 gas. The average kinetic energy of SO 2 molecules is greater than that of H 4 molecules. * solid to gas gas to solid gas to liquid 6 Sulfuric acid, H 2 SO 4, is a diprotic acid. t 298 K, K a1 is much greater than 1, and K a2 = Which of the following has the highest concentration at equilibrium at 298 K in 0.10 mol L 1 H 2 SO 4 (aq)? * H + H 2 SO 4 3 What is K c for the reaction below? 4 u(s) + O 2 (g) 2 u 2 O(s) 2 4 K = [ ] ([ ] [ ] 2 2 ) c u O u O HSO 4 SO 4 2 OH 4 2 Kc = [ u] [ O ] [ u O ] 2 2 = [ ] ([ ][ ]) K 2 2 c u O u O = [ ] Kc O 2 * Kc = 1 /[ O ] 2 7 What is the maximum mass of a(n) 2 that can be obtained from 3.52 g of HN and 1.77 g of a(oh) 2? 2 HN(aq) + a(oh) 2 (aq) a(n) 2 (aq) + 2 H 2 O(l) 1.37 g * 2.20 g 2.66 g 5.99 g Molar masses (in g mol 1 ) HN, a(oh) 2, a(n) 2, H 2 O, g 2 /HM 13 NWS XM 2013 UNIVRSITY OF WTRLOO

2 8 Which of the following has the same number of electrons as a water molecule? H 2 S H 3 * OH eh 2 Ne 2+ 9 Which of the following ions has the smallest ionic radius? K + * a The bond angle in O 3 is closest to 60 o 90 o 109 o * 120 o 180 o 13 What is the formula of magnesium sulfate? MgS MgS 2 Mg 3 S 2 l r MgSO 2 * MgSO 4 P 3 10 In the reaction H 3 NH 2 + H 2 PO 4 H 3 NH HPO What is the final temperature when ml of water at 90.0 and ml of water at 10.0 are mixed? (hoose the closest value.) ssume no heat is lost to the surroundings, and that the density and specific heat of water are constant. the H 2 PO 4 ion acts as 120 o * an acid * 40 o a base 50 o an oxidizing agent 70 o a reducing agent 80 o a catalyst 15 Which of the following has the lowest boiling point? 11 ompared to pure water, a 0.1 mol L 1 solution of sodium chloride has a higher ph a lower electrical conductivity HF * Hl Hr HI a lower boiling point LiF * a lower freezing point a higher vapour pressure 2013 UNIVRSITY OF WTRLOO HM 13 NWS XM / 3

3 16 substance R can react to form product P 1 or product P 2. The reaction profiles for the two reactions are shown below. 19 For gl, K sp = at 298 K. What is [g + ] at equilibrium in a solution prepared by completely dissolving 0.25 moles of gno 3 and 1.0 mole of Nal in 1.0 L of water at 298 K. ssume there is no change in volume. Potential nergy P mol L mol L 1 R P 2 Reaction progress * mol L mol L mol L 1 ompared to the reaction R P 1, the reaction R P 2 is * slower and less endothermic faster and more endothermic slower and more endothermic faster and less endothermic faster and highly exothermic 17 The activation energy for the elementary reaction X Y is exactly 100 kj mol 1 and the enthalpy change is H = 25 kj mol 1. What is the activation energy for the reverse reaction, Y X? * 125 kj mol 1 75 kj mol kj mol 1 25 kj mol kj mol 1 18 Which of the following is a product of the reaction between H 2 SO 4 (aq) and NaOH(aq)? H 2 (g) H + (aq) * H 2 O(l) O 2 (g) SO 2 (g) 20 For mol L 1 Hl(aq), which of the following is true at equilibrium? ph = 8.0 * [l ] = mol L 1 [H + ] = [l ] [Hl] = mol L 1 [H + ] < [l ] 21 Which of the following contains only single bonds? HN H 2 HH 3 H 3 HO * H 3 NH 2 HNNH 22 In their pure form, at 25 o and kpa, most of the elements are network covalent solids * metallic solids molecular solids gases liquids 4 /HM 13 NWS XM 2013 UNIVRSITY OF WTRLOO

4 23 Some standard reduction potentials are given below. Half Reaction Fe 3+ (aq) + e Fe 2+ (aq) Which of the following is the strongest reducing agent under standard conditions? o V I 2 (s) + 2e 2 I (aq) V 2 H + (aq) + 2e H 2 (g) 0.0 V Zn 2+ (aq) + 2e Zn(s) l 3+ (aq) + 3e l(s) 0.76 V 1.66 V 26 Given: l(s) l 2(g) ll 3 (s), H = kj 2 l(s) O 2(g) l 2 O 3 (s), H = 1676 kj 1 2 l 2(g) + O 2 (g) lo 2 (g), H = kj What is the enthalpy change for the reaction below? (hoose the closest value.) 2 ll 3 (s) O 2(g) l 2 O 3 (s) + 3 l 2 (g) 1830 kj Fe kj I * 268 kj H 2 l kj 972 kj * Zn 24 mixture of Znl 2 and dl 2 weighs g. Treatment with gno 3 (aq) converts all of the chloride into g of gl. What is the percent by mass of Znl 2 in the original mixture? (hoose the closest value.) 15.0% 50.0% 53.9% * 62.6% Molar masses (in g mol 1 ) l, Zn, g, d, For an electrochemical cell in which the reaction is Zn(s) + u 2+ (aq) Zn 2+ (aq) + u(s), the voltage is related to concentration by = 1.10 volts volts log ( [Zn 2+ ] / [u 2+ ] ) The cell is set up with 1.0 mol L 1 u 2+ (aq) and excess Zn(s) in a volume of 1.00 L and allowed to run until equilibrium is reached. What is [u 2+ ] at equilibrium? slightly less than 1.0 mol L 1 about 0.50 mol L 1 about mol L % between mol L 1 and mol L 1 * much less than mol L 1 25 onsider the elements in the second period of the p-block. The first ionization of these elements increases steadily from to Ne decreases steadily from to Ne increases from to O, decreases for F, and then increases for Ne decreases steadily from to N and increases steadily from N to Ne * increases steadily from to N, decreases for O and increases steadily from O to Ne 28 flask of volume 2.38 L contains O 2 at a partial pressure of 48.2 kpa and N 2 at a partial pressure of 37.6 kpa. If the temperature is 27 o, how many molecules of N 2 are present? * UNIVRSITY OF WTRLOO HM 13 NWS XM / 5

5 29 Which of the following is a nonpolar molecule with one or more polar bonds? * SO 3 SO 2 33 When the following equation is balanced and written with the smallest whole number coefficients, what is the coefficient of l? 2 Fe 3 O 4 + l l 2 O 3 + Fe H 2 O 3 H 2 O 2 NH 3 30 How many moles of r are in ml of a solution that is mol L 1 with respect to Nar and mol L 1 with respect to ar 2? mol mol * mol mol mol 31 urrently, the last element in group 18 is radon, Rn (Z=86). ased on the building-up principle, what would be the abbreviated ground-state electron configuration for the next element in group 18 should it be discovered or synthesized? [Rn] 7s 2 6f 14 6d 10 7p 6 [Rn] 6s 2 4f 14 5d 10 6p 6 [Rn] 7s 2 6d 10 7p 6 * [Rn] 7s 2 5f 14 6d 10 7p * 8 34 The enthalpy change, ΔH, for the reaction below, is 276 kj per mole of O 2. 4 Hr(g) + O 2 (g) 2 H 2 O(g) + 2 r 2 (g) Which of the following actions, when applied to a reaction mixture at equilibrium, will cause net reaction to the right? adding a catalyst transferring the mixture to a reaction vessel of larger volume decreasing the external pressure * removing some r 2 (g) increasing the temperature 35 What is ph, the change in ph, that occurs when 0.10 ml of 6.0 mol L 1 Hl(aq) is added to 20.0 ml of a solution which is initially 0.12 mol L 1 HOOH and 0.15 mol L 1 NaHOO? hoose the closest value. [Rn] 7s 2 7f 14 7d 10 7p 6 32 The following pairs of solutions are mixed in equal volumes. Which combination does not produce a buffer solution? 0.50 mol L 1 HOOH and 0.40 mol L 1 NaOH * 0.10 mol L 1 NH 3 and 0.10 mol L 1 Hl ph = 0.1 ph = +0.1 * ph = 0.2 ph = 1.5 ph = +1.5 For HOOH, K a = mol L 1 NaHOO and 0.10 mol L 1 HNO mol L 1 HOOH and 0.40 mol L 1 NaHOO 1.00 mol L 1 NH 3 and 1.00 mol L 1 NH 4 l 6 /HM 13 NWS XM 2013 UNIVRSITY OF WTRLOO

6 36 Which of the following species is not linear? * O 3 HN 2 H 2 NNO eh 2 37 cetic acid, H 3 OOH is a weak monoprotic acid with pk a = 4.74 at 298 K. Which of the following should be added to 1.0 L of 1.0 mol L 1 H 3 OOH to obtain a solution with ph = 4.74? ssume that the addition causes no change in volume. (Note: pk a = log 10 K a ) 39 What is the conjugate base of OH? H + H 2 O H 3 O + * O 2 Na + 40 Which of the following compounds has the greatest ionic character? Ir * sf HI HF mol Hl 1.0 mol NaOH OF 2 * 0.50 mol NaOH 0.50 mol NaH 3 OO mol Hl 38 If the reaction W + X Y + Z is exothermic in the forward direction, then what is the effect of an increase in temperature on the forward rate, the reverse rate and the equilibrium constant? Forward Reverse quilibrium Rate Rate onstant increases increases increases increases decreases increases decreases decreases decreases decreases increases decreases * increases increases decreases 2013 UNIVRSITY OF WTRLOO HM 13 NWS XM / 7

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