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1 VOGRO XM 2014 UNIVRSITY OF WTRLOO PRTMNT OF HMISTRY 15 MY 2014 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. 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 3. Print your name (last name, first name and optional middle initial) on the STUNT RSPONS sheet. 4. arefully detach the last page. It is the datasheet. 5. 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. 6. Take care that you make firm, black pencil marks. ode 11 High school student outside anada ode 12 Teacher arefully detach the last page. It is the ata Sheet.
2 1 What is the SI unit for amount of substance? 5 Which of the following has the largest covalent radius? gram carbon, kilogram fluorine, F mole silicon, Si millilitre sulfur, S litre chlorine, l 2 Mercury has a density of 13.6 g ml 1 at 0 o and 101 kpa. For this condition of temperature and pressure, what is the volume of 50.0 grams of mercury? 6 Which of the following statements concerning Hl is not correct? It is a strong acid in water ml The oxidation state of chlorine is ml It is a stronger acid than HF ml 63.6 ml 36.4 ml The bond between hydrogen and chlorine is primarily ionic. It is a gas at 25 o and 101 kpa. 3 How many protons, neutrons and electrons are there in a single 3 H ion? 7 Treatment of 12 H 22 O 11 (table sugar) with excess concentrated H 2 SO 4 yields a black residue (pure carbon) and water vapour. What is the maximum mass of carbon that can be obtained from exactly one gram of 12 H 22 O 11? one neutron, one proton, one electron g two neutrons, one proton, two electrons g one neutron, three protons, two electrons 0.12 g three neutrons, one proton, one electron 0.27 g three neutrons, one proton, two electrons 0.42 g 4 Which of the following exists as an atomic gas at 25 o and 101 kpa? hydrogen chlorine bromine sulfur krypton 8 There are only two naturally-occurring isotopes of gallium. gallium-69: u gallium u If the weighted atomic mass of gallium is u, then what is the percent abundance of gallium-71? 33.8% 39.9% 50.7% 60.1% 2 / VOGRO XM 2014 UNIVRSITY OF WTRLOO 66.2%
3 9 Which pair of compounds are most similar in their physical and chemical properties? Hl and Hr H 2 O and H 2 S 13 oth HlO 4 and Hl are strong acids. Which of the following provides evidence that HlO 4 is a stronger acid than Hl? When dissolved in water, both HlO 4 and Hl ionize completely. O 2 and SiO 2 H 3 OH and (OH) 3 Hl and NaOH The boiling point of HlO 4 is higher than that of Hl. ommercial preparations of concentrated HlO 4 are typically 70% HlO 4 by mass whereas commercial preparations of Hl are about 38% Hl by mass. 10 When the Kelvin temperature of a fixed amount of an ideal gas is doubled and the pressure is doubled, what is the combined effect on the volume of the gas? The volume remains constant. When dissolved in acetic acid (H 3 OOH), HlO 4 ionizes to a greater extent than does Hl. opper metal dissolves readily in a concentrated solution of HlO 4 but not in concentrated Hl solution. The volume increases by a factor of two. The volume increases by a factor of four. 14 What is the general formula of the hydrides formed by the elements () of group 15? The volume decreases by a factor of two. H The volume decreases by a factor of four. H 2 11 What is the correct electron arrangement for a nickel (Ni) 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, 6, 10, 10 10, 10, 8 2, 8, 2, 8, 2, 6 2, 8, 16, 2 2, 8, 8, 8, 2 12 Which set of coefficients properly balances the equation below? Zn(s) + g + (aq) Zn 2+ (aq) + g(s) 1, 1, 1, 1 2, 1, 2, 1 1, 2, 1, 2 2 H H 3 H 4 15 Which second-period atom has the greatest number of unpaired electrons in its lowest energy state? nitrogen, N oxygen, O fluorine, F carbon, boron, 16 Which of the following equations is not correct? r 2 + energy 2 r IF + energy l + + F F + e F + energy all of the above none of the above O 2 (g) O 2 (s) + energy O 2 + energy O + O 2014 UNIVRSITY OF WTRLOO VOGRO XM / 3
4 17 Which combination of elements will most likely form an ionic compound? 21 What volume does 11.0 kg of carbon dioxide occupy at 0 o and kpa? hydrogen and fluorine L sodium and magnesium L magnesium and oxygen 11.0 L oxygen and chlorine 577 L silicon and oxygen 247 L 18 solid sample of impure carbon is 84% by mass. How many carbon atoms are there in a 71.0 g sample? 22 In the reaction below, which element is reduced? 8 KI + 9 H 2 SO 4 4 I KHSO 4 + H 2 S + 4 H 2 O potassium (K) iodine (I) hydrogen (H) sulfur (S) oxygen (O) 19 What gas is produced when ammonium nitrate, NH 4 NO 3, is added to NaOH(aq) and the solution gently heated? hydrogen peroxide, H 2 O 2 oxygen, O 2 dinitrogen tetroxide, N 2 O 4 ammonia, NH 3 nitric oxide, NO 20 What is the maximum amount of HNO 3 that can be obtained from 4.50 moles of NO 2 and 3.00 moles of H 2 O according to the following equation? 23 When 25 ml of 0.10 mol L 1 Hr(aq) is mixed with 25 ml of 0.20 mol L 1 KOH(aq), what is the ph of the final solution at 25 o? What is the formula of copper(ii) nitride? 3 NO 2 + H 2 O 2 HNO 3 + NO 3.00 moles 6.00 moles 7.50 moles 6.75 moles 5.00 moles u 3 N 2 u 2 N u(no 3 ) 2 u 2 NO 3 u 2 N 3 4 / VOGRO XM 2014 UNIVRSITY OF WTRLOO
5 25 What is the pressure of the gas in the apparatus below if the atmospheric pressure is 764 mmhg? 28 In an experiment, a 1.52 gram sample of solid KlO 3 is decomposed by heating to produce Kl and 310 ml of O 2 gas at 25.0 o and 103 kpa. What is the percent yield for this experiment? Gas 48 mm 59% 69% 78% 87% mercury (Hg) 22 mm 96% 26 mmhg 70 mmhg 738 mmhg 790 mmhg 834 mmhg 29 nalysis of a solution of o 2 (SO 4 ) 3 establishes that the concentration of SO 4 2 is mol L 1. What is the concentration of o 3+ in this solution? mol L mol L mol L 1 26 Suppose the atomic mass scale had been set up with calcium (a) assigned a mass of 10 u. What would be the approximate atomic mass of oxygen? mol L mol L u 4.0 u 8.0 u 64 u 160 u 30 Which of the following is an isomer of diethyl ether, H 3 H 2 OH 2 H 3? butanal, H 3 H 2 H 2 HO dimethyl ether, H 3 OH 3 t-butyl alcohol, (H 3 ) 3 OH 27 n unidentified metal X forms a compound with chlorine in which g of X are present for every g of chlorine. The empirical formula of the compound is Xl 2. What is the atomic symbol for X? Hg Mg a Rh Pb butanoic acid, H 3 H 2 H 2 OOH butan-2-one, H 3 H 2 OH 3 31 Which compound contains oxygen in the highest (most positive) oxidation state? KO 3 K 2 O 2 F 2 O K 2 O NO UNIVRSITY OF WTRLOO VOGRO XM / 5
6 32 Which of the following statements is not correct? eviations from ideal gas behaviour are more significant at high pressures. ttractive intermolecular forces cause a decrease in the observed pressure of a gas compared to what is predicted for an ideal gas. 35 Which of the following is the Lewis structure (i.e., the best electron dot structure) for the N 3 ion? N N N N N N eviations from ideal gas behaviour are more significant at very low temperatures. N N N t very high pressures, the observed molar volume of a gas is smaller than what is predicted for an ideal gas. For low to moderate pressures, attractive intermolecular forces are the primary cause of deviations from ideal gas behaviour. N N N N N N 33 solution has [H + ] = mol L 1. What is the ph of this solution? container of helium gas, initially at 217 kpa and 5.00 o, is heated to 80.0 o. The container is opened briefly to allow some gas to escape and then it is closed. If the final pressure is 93.0 kpa, what fraction of the helium gas remains in the container? gaseous compound contains hydrogen, carbon and nitrogen. If combustion of 1.0 L of the compound in oxygen yields 2.0 L O 2, 3.5 L of H 2 O and 0.50 L of N 2, all measured at the same temperature and pressure, what is the empirical formula of the compound? HN H 2 N 2 4 H 7 N H 4 N 7 2 H 7 N 37 In a well-insulated container, an endothermic reaction takes place. When the reaction is done, the temperature of the contents will be higher than before the reaction began higher or lower than at the start of the reaction depending on the masses of reactants used independent of the heat capacities of the substances involved the same as before the reaction began be lower than before the reaction began 6 / VOGRO XM 2014 UNIVRSITY OF WTRLOO
7 38 Which of the following is less soluble in hot water than in cold water? glucose, 6 H 12 O 6 methane, H 4 silver chloride, gl silver nitrate, gno 3 sodium hydroxide, NaOH 39 t high temperatures, hydrogen iodide (HI) reacts reversibly according to the following equation. 2 HI(g) H 2 (g) + I 2 (g) In an experiment, an initial reaction mixture containing mol each of HI, H 2 and I 2 at room temperature is prepared and then heated to a high temperature. fter some time has passed, the amount of HI in the system is found to be moles. What is the amount of H 2 in the system at that time? moles moles moles moles moles mol L 1 aqueous solution of sl is 58.0% sl by mass. What is the density of this solution? Molar masses g/ml (in g/mol) H 2 O, g/ml sl, g/ml 1.74 g/ml 16.3 g/ml 2014 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] ) 8 / VOGRO XM 2014 UNIVRSITY OF WTRLOO
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