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

Transcription

1 VOGRO XM 009 UNIVRSITY OF WTRLOO PRTMNT OF HMISTRY 1 MY 009 TIM: 75 MINUTS 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. The names of the top 00 students will be published in the September issue of hem 13 News. 1. Print your name here:. 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 ode 3 ode 4 ode 5 ode 6 ode 7 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 ny other Ontario student Manitoba or Saskatchewan high school student Québec high school student not used lberta or ritish olumbia high school student ode 9 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 1 Teacher arefully detach the last page. It is the ata Sheet.

2 1 The lead of a pencil is mostly lead, Pb carbon, 5 Which of the following molecules has the same number of electrons as a water molecule? HF H 3 silicon dioxide, SiO silicon, Si O H S calcium carbonate, ao 3 How many protons, neutrons and electrons are there in a single atom of 09 Po? protons, 84 neutrons, 09 electrons 84 protons, 09 neutrons, 84 electrons 09 protons, 15 neutrons, 09 electrons 15 protons, 84 neutrons, 15 electrons 84 protons, 15 neutrons, 84 electrons 3 The mass of one atom of 1 is exactly 1 atomic mass units. With the assumption that a proton and a neutron are equally massive, what is the total number of protons and neutrons in the body of a 75-kg person? (You may neglect the mass of an electron is negligible compared to that of a proton or neutron.) F 6 Which of the following elements is a liquid at room temperature and atmospheric pressure? chlorine phosphorus sulfur bromine iodine 7 What is the formula of the binary compound formed between Mg and P? MgP Mg P MgP Mg P 3 Mg 3 P 8 Which of the following elements has no known stable compounds? neon, Ne xenon, Xe gold, u platinum, Pt 4 Mercury, Hg(l), has a density of 13.6 g ml 1 at 5. What is the volume of 4.5 grams of Hg(l) at 5 o? ml 3.0 ml ml ml ml uranium, U 9 Which of the following elements is believed to be the most abundant in the earth s crust? hydrogen oxygen carbon nitrogen silicon / VOGRO XM 009 UNIVRSITY OF WTRLOO

3 10 Which of the following has the highest concentration at equilibrium when one mole of Hl is dissolved in 1.0 L of water at 5 o? l l + l H Hl 11 What is the symbol for the atom or ion that results from the addition of two protons to a single atom of 4 0 a? 4 + a 44 + a 4 Ti 14 In an experiment, 16 g of methane and 3 g of oxygen react to produce 11 g of carbon dioxide. balanced chemical equation for the reaction is given below. H 4 (g) + O (g) O (g) + H O(g) What is the percentage yield of carbon dioxide in this experiment? 10% 5% 50% 67% 75% 15 If an oxide of nitrogen contains 5.9% by mass of nitrogen, what is its empirical formula? NO N O 44 + Ti Ti NO N O 4 1 In a mixture of N and O gases, all the N molecules and the O molecules have the same average speed average kinetic energy partial pressure average molecular mass average momentum 13 When ethanol, H 3 H OH, is burned in excess oxygen, carbon dioxide and water are the only products. What is the coefficient of O when the chemical equation representing the combustion reaction is balanced using the smallest whole number coefficients? none of the above N O 5 16 What is the percentage by mass of sodium in a mixture containing 1.00 mol Nal and 1.00 mol NaF? 39.3% 45.8% 47.1% 50.0% 54.8% 17 When the hydrides of the group 16 elements are arranged in order of increasing boiling point, the order is H S H Se H Te H O H O H S H Se H Te H Te H Se H S H O H O H Te H Se H S H S H O H Se H Te 009 UNIVRSITY OF WTRLOO VOGRO XM / 3

4 18 How many unpaired electrons are there in a ground state Mn + ion? zero one two three more than three 19 What is the pressure (in mmhg) of the gas inside the apparatus below if P atm = 750 mmhg, Δh 1 = 40 mm and Δh = 30 mm? 710 mmhg P atm Which of the following molecules or ions is planar? (The central atom is underlined and all other atoms are bonded to it.) NH 3 NH 4 + SF 4 SO 3 SO 3 3 What is the formula of iron(ii) sulfate? Fe S FeS 790 mmhg FeSO 4 70 mmhg FeSO mmhg 80 mmhg Gas Δh 1 Δh Fe (SO 4 ) 3 4 The ph of lemon juice is about.3. What is [H + ] in lemon juice? mercury (Hg) 0.36 mol L 1 0 What is the HH bond angle in a formaldehyde (H O) molecule? hoose the closest value. 45 o 90 o 109 o 10 o 180 o 1 Which of the following diatomic molecules has the strongest bond? 0.83 mol L mol L mol L mol L 1 5 Solid aluminum dissolves in hydrochloric acid solution according to the following chemical equation. l(s) + 6 Hl(aq) ll 3 (aq) + 3 H (g) reaction mixture contains mol Hl and mol l. ssuming the reaction goes to completion, how many moles of the excess reactant remain? N O F l r 4 / VOGRO XM 009 UNIVRSITY OF WTRLOO mol mol mol 0.33 mol mol

5 6 What volume does 11 kg of carbon dioxide occupy at 0 o and kpa? 46 m 3 30 Which of the following gases does not burn, does not support combustion, and has no effect on lime water, a(oh) (aq)? L 11 L 0.5 L hydrogen, H oxygen, O carbon monoxide, O 0. m 3 7 What is the ground state electron configuration of an isolated sulfur (S) atom? 1s s p 3s 3p 4s 3d 4p 1s s p 6 3s 1 3p 3 3d 5 1s s p 6 3s 3p 4 1s s p 6 3s 3p 6 1s s p 6 3s 3d 6 8 What volume of 0.13 mol/l aqueous H SO 4 is needed to neutralize 40.0 ml of mol/l aqueous NaOH? balanced chemical equation for the reaction is given below. H SO 4 (aq) + NaOH(aq) Na SO 4 (aq) + H O(l) 8.5 ml nitrogen, N carbon dioxide, O 31 Which of the following elements would you expect to be the most similar in chemical properties to element 0? element 19 element 1 element 18 element 4 element 38 3 weather balloon filled with helium gas, He(g), has a volume of m 3 at ground level where the atmospheric pressure is atm and the temperature is 7 o. fter the balloon rises high above the earth to a point where the atmospheric pressure is atm, its volume increases to m 3. What is the temperature of the atmosphere at this altitude? 56.9 ml 33 o 114 ml o 80.0 ml 73 o 40.0 ml o 9 Three successive elements, in order of increasing atomic number, have these first ionization energies: kj/mol Which of following sets represents the three elements? N O F 40 o 33 In which of these compounds is the oxidation state of O the highest (i.e., the most positive)? F O O F N Ne Na Mg F Ne Na Na Mg l O O 3 H O H SO UNIVRSITY OF WTRLOO VOGRO XM / 5

6 34 The molar volumes of H 6 (g) and H (g), measured at 300 K and 10.0 atm, are.30 L and.51 L, respectively. Which of the following statements accounts for the observation that the molar volume of H 6 (g) is smaller than that of H (g)? H 6 molecules are larger than H molecules.o The intermolecular attractions in H 6 (g) are weaker than they are in H (g). The intermolecular attractions in H 6 (g) are stronger than they are in H (g). The average kinetic energy of H molecules is greater than that of H 6 molecules. The average kinetic energy of H molecules is less than that of H 6 molecules. 35 When aqueous sodium carbonate, Na O 3, is treated with dilute hydrochloric acid, Hl, the products are sodium chloride, water and carbon dioxide gas. What is the net ionic equation for this reaction? g sample of a hydrate of cobalt (II) fluoride, of x H O, was heated to drive off all of the water of hydration. The remaining solid weighed g. What is the formula of the hydrate? of H O of H O of 3H O of 4H O of 5H O 38 How many isomers are there for 4 H 8? onsider both structural (i.e. constitutional) isomers and stereoisomers. one two Na O 3 (aq) + Hl(aq) Nal(aq) + O (g) + H O(l) O 3 (aq) + Hl(aq) H O(l) + O (g) + l (aq) three four more than four O 3 (aq) + H + (aq) H O(l) + O (g) Na O 3 (s) + H + (aq) Na + (aq) + O (g) + H O(l) 39 Which of the following combinations reagents react to form an insoluble precipitate? HNO 3 (aq) and a(oh) (aq) H + (aq) + OH (aq) H O(l) Zn(s) and Hl(aq) 36 Which of the following is the best Lewis structure (i.e., the best electron dot structure) for the N O molecule? Zn(s) and u(no 3 ) (aq) NaHO 3 (aq) and NaOH(aq) Na O 3 (aq) and al (aq) 40 Which of the following will occur if a 0.10 mol L 1 solution of acetic acid (H 3 OOH) is diluted to mol L 1 at constant temperature? the ph will decrease the dissociation constant of H 3 OOH will increase N O N the dissociation constant of H 3 OOH will decrease the hydrogen ion concentration will decrease to mol L 1 the percentage ionization of H 3 OOH will increase 6 / VOGRO XM 009 UNIVRSITY OF WTRLOO

7 T SHT VOGRO XM 009 TH RFULLY H Li Na K Rb s Fr (3) 4 e Mg a Sr a Ra Sc Y La c Ti Zr Hf Rf V Nb Ta b r Mo W Sg Mn Tc (98) 75 Re h 8 6 Fe Ru Os Hs o Rh Ir Mt 10 8 Ni Pd Pt Uun u g u Uuu 1 30 Zn d Hg Uub l Ga In Tl Uut Si Ge Sn Pb N P s Sb i O S Se Te Po (09) F l r I t (10) 18 8 He Ne r Kr Xe Rn () 58 e Th Pr Pa Nd U Pm (145) 93 Np Sm Pu (44) 63 u m (43) 64 Gd m (47) 65 Tb k (47) 66 y f (51) 67 Ho s (5) 68 r Fm (57) 69 Tm Md (58) 70 Yb No (59) 71 Lu Lr (60) 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 98 K) F = mol 1 quations: PV = nrt k t 1/ = ph = pk a + log ( [base] / [acid] ) b± b 4ac x = a 009 UNIVRSITY OF WTRLOO VOGRO XM / 7