1 2 CHEM 1311H 1411 Final Exam Fall 2000 13 December 2000 Use Pencil Do Not Use Pen Circle Your Answer Only the Letter In the reaction A2 aq B s B2 aq A s A A2 is oxidized B B2 is reduced C B is the reducing agent D A is reduced E All of the above Only 2 5 x 105 g of tetrahydrocannabinol THC the active ingredient in marijuana is required to produce intoxication How many molecules of THC C21H30O2 314 5 g mol are required for intoxication A 25 x 105 molecules B 7 95 x 108 molecules C 8 0 x 108 molecules D 6 022 x 1023 molecules E 4 8 x 1016 molecules The volume of a gas is doubled while the temperature is held constant The pressure of the gas A is reduced by one half B is increased by one forth C doubles D varies depending upon the nature of the gas E remains unchanged 5 6 Student Number CH3 COOH aq NaOH aq Na CH3COO aq H2O aq You find that a 25 00 mL sample of vinegar requires 28 33 mL of a 0 953 M solution of NaOH for titration to the equivalence point Calculate the molar concentration of the acetic acid in the vinegar A 1 068 M B 2 14 M C 0 127 M D 0 190 M E 1 62 M 10 11 12 How many grams of Na2CO3 106 0 g mol are required to prepare 2 0 L of a 1 5 M Na2CO3 solution A 80 0 B 106 6 C 160 0 D 240 0 E 320 0 13 14 3 4 Name Arrange the following ions in order of decreasing size A Mg2 Ca2 Ca B Mg2 Ca Ca2 C Ca Ca2 Mg2 2 D Ca Mg Ca2 E Ca2 Mg2 Ca 7 What is the correct formula for ammonium cyanide A Al CN 3 B NH4NO3 C NH4CN D NaNO3 E NH3N3 8 What is the oxidation number of oxygen in the major reaction product resulting from the interaction of potassium metal with an excess of oxygen A 0 B 1 2 C 1 D 1 E 1 2 9 Vinegar contains acetic acid 60 05 g mol and reacts with sodium hydroxide 40 0 g mol according to the reaction given below 15 1 H2 O 2 HF 3 BCl3 Which of the following is true A 3 is polar B 1 and 3 are polar C 1 is polar D 2 and 3 are polar E 1 2 and 3 are polar 16 The empirical formula of maleic acid is CHO Its molar mass is 116 1 g mol Its molecular formula is A CHO B C2H2 O2 C C4 H4O4 D C5 H5O5 E C6H6 O6 17 Butylated hydroxytoluene BHT below is widely used as a food preservative CH3 H H CH3 CH3 H3C C CH3 C CH3 OH CH3 According to valence bond theory what is the total number of bonds present in BHT A 23 B 15 C 30 D 52 E 43 18 19 Consider the two similar compounds below Cl Pt 28 Cl NH3 Cl Cl Pt NH3 NH3 NH3 I II Compound I cisplatin is used in cancer therapy The molecular structure of both compounds is square planar Which would be expected to be soluble in pentane C5H12 A I B II C Neither D Both E Depends upon pH level 29 How many unpaired electrons are present in Zn2 A 0 B 1 C 2 D 3 E 4 30 Which of the following has delocalized electrons H H H H H H H H H H H H H 22 Two 2 000 moles of Ni atoms have the same mass as 1 223 moles of atoms of which other element A Sn B Pd C Ga D Mo E Pt 23 Consider the following reaction Fe2O3 s 3CO g 2Fe s 3CO2 g If you begin with 150 g of Fe2O3 159 7 g mol as the limiting reagent calculate the theoretical yield of iron 55 6 g mol A 105 g Fe B 300 g Fe C 75 g Fe D 50 g Fe E 120 g Fe 24 According to Valence Bond Theory predict the hybridization of the central atom in XeF4 A sp B sp2 C sp3 D sp3d E sp3d2 25 Molecule X effuses twice as fast as Molecule Y Thus the molecular mass the molecular mass of X is of Y A twice B one fourth C four times D one half E the same as 26 Which is the largest bond angle A angle O S O in SO3 B angle Cl C Cl in HCCl3 C angle F Be F in BeF2 D angle H O H in H2 O E angle H S H in H2S 27 Which is planar A PCl3 D NH3 B ClO3E PH3 C CO32 H H H H H C H H H H H H H H H H H B H 21 Determine the oxidation number of phosphorus in Mg2P2O4 A 1 B 2 C 3 D 4 E 5 H H A 20 Commercial concentrated nitric acid is 69 HNO3 63 01 g mol by weight and has a density of 1 42 g mL What is the molarity of this solution A 2 0 M B 4 0 M C 8 0 M D 16 M E 32 M H H H H H H D H H E 31 32 In the balanced equation describing the complete combustion of dodecane C12H26 what is the oxygen coefficient A 1 B 2 C 37 D 24 E 26 33 What is the molecular structure of IF5 A sea saw B pyramidal C octahedral D square pyramidal E trigonal bipyramidal 34 The following reaction gave a 60 yield of NaOH How many milligrams of NaOH were produced in this reaction 2 Na 2 H2 O 2 NaOH H2 23 0 mg 36 0 mg A 12 0 mg D 45 0 mg B 20 0 mg E 80 0 mg C 24 0 mg 35 A solution of NaOH 40 0 g mol is standardized against potassium hydrogen phthalate KHP 204 2 g mol H O C O H NaOH C O K H O H O C O Na H C O K H H H H 2O H O From the following data calculate the molarity of the NaOH solution mass of KHP 0 8407 g buret reading before titration 0 23 mL buret reading after titration 38 78 mL A 0 1068 M B 0 214 M C 0 320 M D 0 427 M E 0 534 M CHEM 1311H 1411 Final Exam Grade Calculation There are 35 problems with a value of 3 points each Your grade is simply based upon the number of correct answers multiplied by three Thus it is possible to score 105 out of 100 CHEM 1311H 1411 Final Grade Calculation Your Final Grade in this course may be derived as described in the course syllabus Average of Best Three Hour Exams 65 …