Atomic mass:a) Simplest formulaLAST NAME, FirstNameFormulaPhosphoric acidCHEM 107 (Fall-2006)Exam 1 (104 pts)Name: ------------------------------------------------------------------------, Clid # ------------------------------- LAST NAME, First(Circle the alphabet segment of your LAST NAME): A-C D-H I-L M-O P-Z Please answer the following questions:Part I: Multiple Choices (48 pts: 12 @ 4 pts each + 4 pts bonus). Circle the ONE best answer:1. An atom containing 34 protons, 43 neutrons, and 34 electrons would have the symbol:a) 77Se b) 77Irc) 43Se d) 43Tc2. Oxygen is the third most abundant element in the universe and makes up about two thirds of the human body. Which of the following statements is classified as an extensive property?a) Liquid oxygen boils at 90.2 K.b) Liquid oxygen is pale blue.c) Oxygen has a density of 1.43 g/L at 0º C.d) A volume of 22.4 L of oxygen gas weighs 32 g 0º C.3. Perform the indicated operations and give the answer in cm with the proper number of significant figures.(28.1 cm – 5.30 mm + 0.75321 m)/(5.0 cm) = ?a) 20.8 b) 6.8c) 21 d) none of the above4. Which name is incorrect?a) Mg(NO3)2: magnesium nitrate b) CoSO4: cobalt(II) sulfatec) Fe2S3: diiron trisulfide d) S2F4: disulfur tetrafluoride 5. Predict the product of the reaction of gallium, Ga with selenium, Se.a) Ga2Se3 b) Ga3Se2 c) GaSe2 d) Ga2Se26. Which of the following statements is incorrect?a) A proton carries a +1 charge and an electron carries -1 charge.b) A neutron is an uncharged particle with a mass slightly greater than a proton.c) More than 99.9% of an atom’s mass is concentrated in the nucleus in which protons and neutrons are located.d) None of the above17. Naturally occurring neon consists of two isotopes Ne-20 and Ne-22. The atomic mass of Ne is approximately 20.2. What are the reasonable estimates of the relative percentages of Ne-20 and Ne-22, respectively?a) 10, 90 b) 90, 10 c) 80, 20 d) 50, 50 8. How many electrons, protons, and neutrons are found in a 208Pb2+ ion? a) 82 electrons, 82 protons, 126 neutronsb) 80 electrons, 82 protons, 126 neutrons c) 84 electrons, 82 protons, 126 neutrons d) 80 electrons, 82 protons, 46 neutrons9. What is the number of moles of Br2 that contain 6.022 x 1021 molecules of Br2?a) 0.01 b) 3.768 x 1019c) 1.598 d) no answer was given10. Calculate the percent of nitrogen by mass in ammonium nitrate.a) 35 b) 17.5c) 22 d) no answer was given11. What mass of phosphorus trichloride, PCl3 in grams that can be made from 35.0 g Cl2 (g) according to the following equation?2 P (s) + 3 Cl2 (g) 2 PCl3 (l)a) 45.2b) 67.8c) 90.4d) 15.112. Which of the following could be a simplest formula?a) N2O4b) N2 c) C6H5Br d) C6H3F313. (Bonus: 4 pts) When 0.225 mol butane, C4H10, is burned with excess oxygen how many molecules of oxygen are consumed? 2 C4H10 (g) + 13 O2 (g) 8 CO2 (g) + 10 H2O (l)a) 1.46 b) 8.87 x 1023c) 5.42 x 1023d) no answer was given2Part II. Names, formulas and properties (28 pts: 14 @ 2 pts each) – NO Partial Credits1. (16 pts) Complete the following table with the formula or the name of the compoundName FormulaCu(NO3)2Chromium(III) oxideMagnesium nitridePhosphoric acidFe3(PO4)2S2F4Potassium chlorateHBr (g)2. (12 pts) Consider the following substances: SO3, XeOF4, N2, ScCl3, AsCl3, NiSO4 and NO2.a) Which are diatomic? ------------------------------------b) Which are ionic? ------------------------------------c) Which are molecular (covalent)? ------------------------------------d) Which compound is derived from a noble gas? ------------------------------------e) Which compound(s) is derived from a transition metal? ------------------------------------f) Which compound is derived from a metalloid element? -------------------------------------Part III. Calculations (24 pts): Show all work for full credit. Please express all answers with theproper units and correct number of significant figures.1. (8 pts) Copper (Cu), an excellent conductor of heat is composed of two isotopes. One of theisotopes has an atomic mass of 62.9208 amu and 69.09 % abundance. What is the atomic mass ofthe other isotope and what is its mass number?3Atomic mass: 64.9278Mass number:652. (16 pts) Caffeine is the compound that found in coffee, tea, and cola drinks and has a marked stimulatory effect on mammals. Chemical analysis of caffeine shows that it contains 49.38% C, 5.26% H, 28.76% N, and 16.60% O by mass, and its experimentally determined molar mass is 196 g/mol. Calculate:a) the simplest formula andb) the molecular formula of caffeine4a) Simplest formulaC4H5N2Ob) Molecular formulaC8H10N4O2Exam 1 – Fall 2006You will have 50 minutes to complete this exam. The exam has 4 pages plus the Periodic Table Reference page.When you are told to do so, tear off the Periodic Table cover sheet and use as required during the exam.1.11H1.01Periodic Table of the Elements2He4.0023Li6.944Be9.015B10.816C12.017N14.018O16.009F19.0010Ne20.18311Na22.9912Mg24.3013Al26.9814Si28.0815P30.9716S32.0617Cl35.4518Ar39.95419K39.120Ca40.0821Sc44.9622Ti47.8823V50.9424Cr52.0025Mn54.9426Fe55.8527Co58.9328Ni58.6929Cu63.5530Zn65.3831Ga69.7232Ge72.5933As74.9234Se78.9635Br79.9036Kr83.80537Rb85.4738Sr87.6239Y88.9140Zr91.2241Nb92.9142Mo95.9443Tc(98)44Ru101.145Rh102.946Pd106.447Ag107.948Cd112.449In114.850Sn118.751Sb121.852Te127.653I126.954Xe131.1655Cs132.956Ba137.357La138.972Hf178.573Ta181.074W183.875Re186.276Os190.277Ir192.278Pt195.179Au197.080Hg200.681Tl204.482Pb207.283Bi209.084Po(209)85At(210)86Rn(222)787Fr(223)88Ra226.089Ac227.0104Rf(261)105Db(262)106Sg(263)107Bh(262)108Hs(265)109Mt(266)110Uun(269)111Uuu(272)112Uub(277)58Ce140.159Pr140.960Nd144.261Pm(145)62Sm150.463Eu152.064Gd157.265Tb158.966Dy162.567Ho164.968Er167.369Tm168.970Yb173.071Lu175.090Th232.091Pa231.092U238.093Np237.094Pu(244)95Am(243)96Cm(247)97Bk(247)98Cf(251)99Es(252)100Fm(257)101Md(258)102No(259)103Lr(260)5PREFERENCE SHEET FOR CHEM 107Useful Information:T (˚F) = 1.8 T (˚C) + 32˚ d = m / VAvogadro’s Number, NA = 6.022 x