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

Transcription

1 VOGRO XM 2006 UNIVRITY OF WTRLOO PRTMNT OF HMITRY 18 MY 2006 TIM: 75 MINUT This exam is being written by several thousand students. Please be sure that you follow the instructions below. We'll send you a report on your performance. Top performers are eligible for a prize. 1. Print your name here: 2. Print your school name and city on your TUNT RPON sheet. 3. elect, and enter on the TUNT RPON sheet, one of the following O numbers: ode 1 ode 2 ode 3 ode 5 ode 6 ode 8 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 Manitoba or askatchewan high school student Québec high school student lberta or ritish olumbia high school student ode 9 New runswick, Newfoundland, Nova cotia or Prince dward Island high school student ode 10 Northwest Territories, Nunavut, or Yukon high school student ode 11 High school student outside anada ode 12 Teacher 4. Print your name (last name, first name and optional middle initial) on the TUNT RPON sheet. lso fill in the corresponding circles below your printed name. 5. arefully detach the last page. It is the atasheet. 6. Now answer the exam questions. Questions are not in order of difficulty. Indicate your choice on the TUNT RPON 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. arefully detach the last page. It is the ata heet.

2 1 How many neutrons, protons and electrons are there in one 17 O 2 ion? 8 5 Which of the following has the same number of electrons as an argon atom, r? 17 protons, 8 electrons and 8 neutrons 8 protons, 6 electrons and 17 neutrons 8 protons, 10 electrons and 9 neutrons 9 protons, 10 electrons and 8 neutrons 8 protons, 6 electrons and 9 neutrons P 3+ a + Ne 2 r 2 sample of an unidentified element has the properties below. It is a conducting solid at room temperature. It forms an acidic oxide. Its only chloride is a colourless, non-polar liquid. The element is most likely carbon sodium magnesium phosphorus bromine 6 Which group contains the elements with the highest melting points? group 13 group 14 group 15 group 16 group 17 7 What is the correct Lewis symbol for the sulfur atom? 3 In which one of the following is a wrong symbol given for the name of one element? zinc Zn; nickel Ni iron Fe; potassium K phosphorus P; silver g boron ; beryllium e magnesium Mn; sodium Na 4 Which of the following is a chemical property of chlorine? It is yellowish green. It burns in sodium vapour. It dissolves in carbon tetrachloride. It has a density of 3.2 g L 1 at 0 o and 101 kpa. It boils at 34 o UNIVRITY OF WTRLOO VOGRO XM /2

3 8 What is the missing product in the reaction below? 12 What is the chemical formula for iron (II) oxide? 16 8 O O? He FeO 12 6 Fe 2 O Mg i P FeO 2 Fe 3 O 2 Fe 2 O 3 13 Which of the following is not an ionic compound? ammonium nitrate, NH 4 NO 3 9 Which of the following atoms has the largest first ionization energy? potassium fluoride, KF hydrogen fluoride, HF r magnesium oxide, MgO K lithium hydride, LiH a l 10 The properties of element 12 will most resemble those of element 10 element 11 element 13 element 19 element Which of the following processes is not possible? Mg(g) + energy Mg 2+ (g) + 2e Na(g) + e Na + (g) + energy H 2 (g) + energy 2 H + (g) + 2e 14 Which of the following compounds has the highest boiling point? H 3 l H 2 =H 2 H 3 -O-H 3 HO-H 2 H 2 -OH PH 3 15 What is the value of x when the following equation is balanced? 1 3 H 8 (g) + x O 2 (g) y O 2 (g) + z H 2 O(g) F(g) + e F (g) + energy Ne + (g) + e Ne(g) + energy UNIVRITY OF WTRLOO VOGRO XM /3

4 16 Which of the following molecules contains a triple bond? O 2 20 Which one of the following will react appreciably with water at room temperature to produce hydrogen gas? HN H 2 HOF H 4 N 2 H 2 ah 2 H 2 O NH 3 Hl 17 Which of the following produces the greatest number of ions when one mole of the substance dissolves in water? 21 How many litres of O 2 are required to burn one litre of 2 H 2 if the products are exclusively O 2 and Kl NH 4 l H 2 O? ssume that the volumes of O 2 and 2 H 2 are measured at the same temperature and pressure. NH 4 NO 3 Na 2 O 4 H 2 O 4 18 gas is generally most soluble in water at low pressure and low temperature low pressure and high temperature high pressure and low temperature high pressure and high temperature medium pressure and medium temperature 22 What is the coefficient of Fe 2+ (aq) when the equation below is balanced using the smallest whole number coefficients? Fe 3+ (aq) + Fe(s) Fe 2+ (aq)? 1 19 The bubbles that can be seen in boiling water are mainly 2 3 hydrogen oxygen hydrogen and oxygen air water vapour UNIVRITY OF WTRLOO VOGRO XM /4

5 23 How many moles of water are there in L of water at 25 o and 101 kpa? The density of water is 1.0 g ml 1 at 25 o and 101 kpa mol 55.6 mol 31.3 mol 29.4 mol 27.8 mol 24 If 6.50 grams of Zn(s) dissolves completely in excess dilute Hl solution, then what is the mass of Znl 2 produced? 26 What is [H + ] in a solution for which the ph is 3.87? mol L mol L mol L mol L mol L If the percent yield of the reaction below is 98.5%, then what mass of O 2 is needed to produce 49.0 grams of NO 2? N 2 H 4 (g) + 3 O 2 (g) 2 NO 2 (g) + 2 H 2 O(g) 6.50 g 50.4 g 7.82 g 51.9 g 10.8 g 25.9 g 13.5 g 23.1 g 27.3 g 11.5 g 25 Metallic copper, u, is made from chalcopyrite, ufe 2, according to the following chemical reactions. 2 ufe 2 + 9/2 O 2 u 2 + Fe 2 O O 2 28 What is the concentration of a sodium chloride solution if 1.00 g of sodium chloride, Nal, is dissolved in water to make 415 ml of solution? u 2 + 3/2 O 2 u 2 O + O 2 u u 2 O 6 u + O mol L 1 How many kilograms of copper can be obtained from one kilogram of chalcopyrite? mol L kg mol L kg mol L kg 1.00 mol L kg 1.04 kg 2006 UNIVRITY OF WTRLOO VOGRO XM /5

6 29 stable organic compound has the following composition by mass: 52.1% 13.1% H 34.8% O The molar mass of the compound is 45 ± 2 g mol 1. Which of the following molecular formulae is consistent with these data? HO 2 2 H 4 O 2 H 5 O H 2 O 2 2 H 6 O 32 The reaction NH 3 (aq) + Hl(aq) NH 4 l(aq) is an example of a precipitation reaction an acid-base reaction a decomposition reaction an oxidation-reduction reaction an isomerization reaction 33 The Lewis structure (i.e. electron dot) structure for the O 3 molecule is given below. O O O The bond angle is nearest to 30 The average atomic mass of boron,, is oron has only two stable isotopes, 10 and with masses of and 11.00, respectively. What is the percentage abundance of 11? 5 60 o 90 o 105 o 120 o 180 o 81% 96% 84% 73% 91% 31 Which piece of apparatus is the most appropriate for measuring and transferring ml of dilute acid solution from one container into another? 34 neutral atom whose lowest electronic configuration is [Rn] 7s 2 5f 14 6d 10 7p 4 belongs to the same group as oxygen (O) beryllium (e) carbon () titanium (Ti) chromium (r) a pipette a burette an rlenmeyer flask a graduated cylinder a test tube 35 What are the so-called spectator ions when solutions of Hl(aq) and KOH(aq) are mixed? H + and K + OH and l H + and OH K + and l H + and O UNIVRITY OF WTRLOO VOGRO XM /6

7 36 How many moles of gas are there in a volume of 1.00 L at 1.00 MPa and 500 K? ssume ideal gas behaviour mol 0.55 mol 1 MPa = Pa 39 xactly moles of hydrogen gas (H 2 ) is collected over water at 298 K using the apparatus shown below. The total pressure of the gas collected is kpa. What is the total volume of gas collected? 4.2 mol 9.9 mol 22.4 mol H 2 (g) water The vapour pressure of water is 3.17 kpa at 298 K g sample of an unknown gas occupies a volume of L at o and 50.0 kpa. What is the molar mass of the gas? 160 g mol g mol g mol ml 239 ml 245 ml 251 ml 259 ml 29 g mol g mol If the kelvin temperature of a sample of ideal gas doubles (e.g. from 200 K to 400 K), then the average molecular velocity of the molecules in the sample increases by a factor of 2 increases by a factor of 2 decreases by a factor of 2 increases by a factor of 4 40 Plants use the process of photosynthesis to convert carbon dioxide, water and energy into glucose and oxygen. The process of photosynthesis can be represented by the following chemical equation. 6 O H 2 O kj 6 H 12 O O 2 It is estimated that the sun provides about 2.1 J on each square centimetre of the earth s surface every minute. How long would it take for ten identical leaves to make 1.8 grams of glucose if the area of each leaf is 10 cm 2 and if only 10% of the energy received is used in the photosynthesis reaction? decreases by a factor of hours 2.2 hours 4.4 hours 18 hours 22 hours 2006 UNIVRITY OF WTRLOO VOGRO XM /7

8 T HT VOGRO XM 2006 TH RFULLY H Li Na K Rb s Fr (223) e Mg a r a Ra c Y La c Ti Zr Hf Rf V Nb Ta b r Mo W g Mn Tc (98) 75 Re h 8 26 Fe Ru Os Hs o Rh Ir Mt Ni Pd Pt Uun u g u Uuu Zn d Hg Uub l Ga In Tl Uut i Ge n Pb N P s b i O e Te Po (209) F l r I t (210) He Ne r Kr Xe Rn (222) 58 e Th Pr Pa Nd U Pm (145) 93 Np m 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) Ideal Gas equation: PV = nrt 2006 UNIVRITY OF WTRLOO VOGRO XM /8