Carefully detach the last page. It is the Data Sheet.

Transcription

1 VOGRO XM 2013 UNIVRSITY OF WTRLOO PRTMNT OF HMISTRY 16 MY 2013 TIM: 75 MINUTS This exam is being written by several thousand students. Please be sure that you follow the instructions below. We'll send your teacher a report on your performance. Top performers are eligible for a prize. The names of the top 200 students will be published in the September issue of hem 13 News. 1. Print your name here: 2. Print your school name and city on your STUNT RSPONS sheet. 3. Select, and enter on the STUNT RSPONS sheet, one of the following O numbers: ode 1 ode 2 ode 3 ode 4 ode 5 ode 6 ode 7 ode 8 ode 9 Ontario, now studying Grade 11 hemistry in a nonsemestered school Ontario, now studying Grade 11 hemistry in a semestered school Ontario, Grade 11 hemistry already completed ny other Ontario student Manitoba or Saskatchewan high school student Québec high school student not used lberta or ritish olumbia high school student New runswick, Newfoundland, Nova Scotia, or Prince dward Island high school student ode 10 Northwest Territories, Nunavut, or Yukon high school student 4. Print your name (last name, first name and optional middle initial) on the STUNT RSPONS sheet. lso fill in the corresponding circles below your printed name. 5. arefully detach the last page. It is the datasheet. 6. Now answer the exam questions. Questions are not in order of difficulty. Indicate your choice on the STUNT RSPONS sheet by marking one letter beside the question number. Mark only one answer for each question. Questions are all of the same value. There is a penalty (1/4 off) for each incorrect answer, but no penalty if you do not answer. 7. Take care that you make firm, black pencil marks, just filling the oval. e careful that any erasures are complete make the sheet white again. ode 11 High school student outside anada ode 12 Teacher arefully detach the last page. It is the ata Sheet.

2 1 n ion having 18 electrons, 15 protons and 16 neutrons has a mass number of? 5 In which region of the periodic table would you find the elements of highest electronegativity? upper left upper right middle bottom left bottom right 2 Which of the following elements has the greatest density at 25 o and 101 kpa? cesium, s radon, Rn lead, Pb carbon, iron, Fe 6 Which of the following most correctly represents the reaction between hydrochloric acid and water? Hl + H 2 O H 2 + HOl Hl + H 2 O 2 H + + OH + l Hl + H 2 O H 3 O + + l Hl + H 2 O 3 H + + O 2 + l Hl + H 2 O 3 H + + Ol 3 ompared to an electron, a neutron has the same charge and about the same mass 7 ommon table sugar is a compound with the formula 12 H 22 O 11. How many oxygen atoms are present in one mole of 12 H 22 O 11? no charge and a much greater mass the opposite charge and much less mass no charge and much less mass the opposite charge and a much greater mass To which of the following elements does the term metalloid apply most fittingly? hydrogen lithium beryllium boron mercury 8 Which measurement is the most uncertain? 0.10 ± 0.01 g 2.00 ± 0.05 L 1.00 ± 0.01 mm ± ml ± kg 2 / VOGRO XM 2013 UNIVRSITY OF WTRLOO

3 9 compound is 53% carbon and 47% oxygen by mass. What is the empirical formula of the compound? O 2 12 ccording to the following equation, how many moles of O 2 can be produced from 10.0 g Fe 2 O 3 and excess O? 3 Fe 2 O 3 + O 2 Fe 3 O 4 + O 2 O 3.33 moles 2 O 3 3 O 2 53 O moles moles 1.00 moles moles 10 one litre sample of nitrogen gas is compared to a one litre sample of hydrogen gas, both at 25 o and 101 kpa. Which of the following statements is true? Nitrogen and hydrogen molecules have the same average speed. 13 Which of the following is a weak electrolyte in water? HNO 3 KOH On average, nitrogen molecules move more slowly than the hydrogen molecules do. Hydrogen molecules have a greater average kinetic energy than the nitrogen molecules do. HF Hr NH 4 F On average, hydrogen molecules hit the walls of the container with more force than the nitrogen molecules do. On average, nitrogen molecules hit the walls of the container with more force than the hydrogen molecules do. 14 What is the minimum volume of 6.00 mol L 1 H 2 SO 4 (aq) required to neutralize 2.00 L of 2.25 mol L 1 NaOH(aq)? 2 NaOH(aq) + H 2 SO 4 (aq) Na 2 SO 4 (aq) + 2 H 2 O(l) L 11 What is the correct electron arrangement for an arsenic (s) atom? (The first number in each list refers to the number of electrons in the first shell; the second number refers to the number of electrons in the second shell; and so on.) 2, 8, 18, L L 1.50 L 6.75 L 10, 10, 3 2, 8, 2, 8, 2, 8, 2, 1 2, 6, 10, 14, 1 8, 8, 8, 8, 1 15 Which ion does not have the same shape as H 4? + NH 4 F 4 2 SO 4 PF 4 ro UNIVRSITY OF WTRLOO VOGRO XM / 3

4 16 n element occurring in nature as a metal, such as silver or gold, is likely to react readily with oxygen to form a protective coating be at the high end of the activity series of metals 20 The following sequence of reactions is used in the preparation of sodium sulfate, Na 2 SO 4.What is the minimum amount of O 2 required to make 1.0 mole of Na 2 SO 4? S + O 2 SO 2 2 SO 2 + O 2 2 SO 3 react readily with strong acids to release hydrogen gas SO 3 + H 2 O H 2 SO 4 2 NaOH + H 2 SO 4 Na 2 SO H 2 O lose some of its valence electrons easily 0.33 moles undergo oxidation only with difficulty 0.50 moles 17 Which of the following involves a chemical change? crystallization electrolysis 1.0 mole 1.5 moles 2.0 moles distillation sublimation vaporization 18 When a sample of sugar, 12 H 22 O 11, is treated with concentrated H 2 SO 4, a black product (carbon) is obtained. The action of concentrated H 2 SO 4 on sugar illustrates the fact that H 2 SO 4 is 21 The chemical equation representing the decomposition of nitroglycerine, 3 H 5 (NO 3 ) 3, is given below. 4 3 H 5 (NO 3 ) 3 (s) 12 O 2 (g) + 6 N 2 (g) + O 2 (g) + 10 H 2 O(g) What is the total volume of gas produced at 100 o and 2 atm from 454 grams of nitroglycerine? 89.6 L 111 L a powerful dehydrating agent 162 L highly unstable 222 L a strong acid a strong oxidizing agent a strong reducing agent 444 L 22 onsider the following unbalanced equation. (This question can be answered without balancing the equation.) 19 What is the oxidation state of chlorine in NalO 3? s 2 S 5 + HNO 3 H 3 so 4 + H 2 SO 4 + NO 2 Which of the following statements is true? s of s 2 S 5 is oxidized. N of HNO 3 is reduced. S of s 2 S 5 is reduced. s of s 2 S 5 is reduced. s 2 S 5 is acting as an oxidizing agent. 4 / VOGRO XM 2013 UNIVRSITY OF WTRLOO

5 23 If an element X forms the following stable compounds and ions, what is element X? X 2 beryllium, e NX 3 ax SX L sample of wet hydrogen gas was collected over water at a barometric pressure of Torr and a temperature of 21.7 o. The vapour pressure of water at this temperature is Torr. What is the volume of the dry hydrogen gas at STP? carbon, fluorine, F oxygen, O hydrogen, H L L L L 22.4 L 760 Torr = 1 atm STP = 1 atm and 0 o 24 Which of the following statements is not correct? The first ionization energy generally decreases from top to bottom within a group. The atomic radius generally increases from top to bottom within a group. The first ionization energy generally decreases from left to right across a period. The second ionization energy of an atom is always greater than the first ionization energy. The atomic radius generally decreases from left to right across a period. 25 Which of the following atoms has more than two unpaired electrons in its ground electronic state? germanium, Ge selenium, Se scandium, Sc nickel, Ni iron, Fe 28 What mass of impure solid KOH is needed to make up 1.20 L of 0.60 mol L 1 KOH(aq)? ssume the impure KOH is 84% KOH by mass and 16% water g 40.4 g 48.1 g 87.0 g 112 g 29 In an experiment, 4 drops of mol L 1 uso 4 (aq) were added to ml of (NH 4 ) 2 S 2 O 8 solution. What is the resulting concentration of uso 4? ssume that 20 drops is equivalent to 1 ml mol L mol L mol L mol L mol L 1 26 Which of the following molecules has the shortest carbon-carbon bond? 30 For a chemical reaction, the limiting reactant is the one that is H 3 H 3 H 2 H 2 2 H 2 least stable most stable most expensive H 3 OOH still present after the reaction is complete H 3 H 2 OH completely used up 2013 UNIVRSITY OF WTRLOO VOGRO XM / 5

6 31 uring the process K(g) K + (g) + e energy is released and the ion is larger than the atom energy is absorbed and the ion is larger than the atom energy is released but the atom and the ion have the same size energy is absorbed and the ion is smaller than the atom energy is released and the ion is smaller than the atom 32 In the phrase like dissolves like, to what does the word like refer? 35 The ph of an aqueous solution at 25 o is What is the hydrogen ion concentration, [H + ]? 9.8 mol L mol L mol L mol L mol L 1 36 What is the minimum volume of O 2 needed to burn completely 15.0 L H 4 at standard temperature and pressure? 15.0 L densities 7.50 L molar masses 30.0 L heats of formation heats of solution molecular polarities 5.0 L 45.0 L 33 Which of the following salt solutions will have a ph nearest to 7 at 25 o? 0.1 mol L 1 NaNO 3 (aq) 0.1 mol L 1 NH 4 r(aq) 0.1 mol L 1 KHSO 4 (aq) 0.1 mol L 1 NaHO 3 (aq) 0.1 mol L 1 Na 2 O 3 (aq) 34 When grams of a compound is vapourized, its volume is L at 180 o and 84.7 kpa. What is the molar mass of the compound? 23.8 g mol g mol g mol g mol 1 37 Which of the following compounds is ionic? H 2 O af 2 PF 3 Si SiF 4 38 Which of the following has no lone pairs on the underlined atom? OF 2 H 2 S NH 4 + H 3 O + HOF 60.0 g mol 1 6 / VOGRO XM 2013 UNIVRSITY OF WTRLOO

7 39 mixture of Fe 2 O 3 and uo weighing g is reduced in a stream of hot hydrogen gas. The resulting mixture of metallic iron and metallic copper weighs g. What was the percentage by mass of Fe 2 O 3 in the original mixture? 21.7% 48.1% 69.3% 72.1% Molar masses (in g mol 1 ): O, 16.0 Fe, u, Fe 2 O 3, uo, % 40 For the reaction products, the concentration of decreases by a factor of two every 32 minutes. If the initial concentration of is 1.0 mol L 1, what is the concentration of after 48 minutes? 0.33 mol L mol L mol L mol L 0.25 mol L UNIVRSITY OF WTRLOO VOGRO XM / 7

8 T SHT VOGRO XM TH RFULLY H Li Na K Rb s Fr (223) e Mg a Sr a Ra Sc Y La-Lu c-lr Ti Zr Hf Rf V Nb Ta b r Mo W Sg Mn Tc (98) 75 Re h 8 26 Fe Ru Os Hs o Rh Ir Mt Ni Pd Pt s u g u Sg Zn d Hg n l Ga In Tl Si Ge Sn Pb N P s Sb i O S Se Te Po (209) F l r I t (210) He Ne r Kr Xe Rn (222) 57 La c (227) 58 e Th Pr Pa Nd U Pm (145) 93 Np Sm Pu (244) 63 u m (243) 64 Gd m (247) 65 Tb k (247) 66 y f (251) 67 Ho s (252) 68 r Fm (257) 69 Tm Md (258) 70 Yb No (259) 71 Lu Lr (260) onstants: onversion factors: N = mol 1 1 atm = kpa = 760 Torr = 760 mm Hg R = atm L K 1 mol 1 0 o = K = kpa L K 1 mol 1 = J K 1 mol 1 K w = (at 298 K) F = mol 1 quations: PV = nrt k t 1/2 = ph = pk a + log ( [base] / [acid] ) x ± = 2 b b 4ac 2a 8 / VOGRO XM 2013 UNIVRSITY OF WTRLOO