Final Exam Review hem 110 MJ Bojan EM 110 EXAM Final Exam Fri. May 3 10:10am noon Locations are assigned by section and are posted on the Web. (IGNORE e-lion listings) http://courses.chem.psu.edu/chem110spring! 40 multiple choice questions.! comprehensive (35-30% on material since exam 3. See sample practice exams on the hem 110 Web page: select andouts. Final Exam Review
EM 110 EXAM Final Exam Fri. May 3 10:10am - noon Bring #2 pencils PSU Photo ID alculator may NOT be text programmable! Know: your hem 110 section # Your PSU Student ID number Do NOT BRING: cell phones, PDAs, or any other electronic devices. AFTER TE EM 110 FINAL EXAM Fri. May 3, 10:10am noon Answer Key will be posted on the Web by ~2pm on Friday.! If you self grade your final, you can determine your grade instantly using the cutoffs in the syllabus (and posted on Web).! UTS will send score reports via e-mail: summary score is used to assign grades (cutoffs given in syllabus). heck your grades (RQ, Quiz, ALEKs grades too)! If there are problems, see Mike in 210 Whitmore.! Summary grade cutoffs (including +/-) will be posted on the Web (hem 110 Web page, under News and Updates). DO NOT ASK FOR UT-OFFS VIA E-MAIL Final Exam Review
48.6 g Mg reacts with 11.2 L O 2 at STP. A What is the expected yield (theoretical yield) of MgO (in grams) B Which reactant is the limiting reagent, and which is in excess? ow much of the excess reagent remains after the reaction goes to completion? D What is being oxidized? What is being reduced? E. When you react Mg with O 2 in lab, you get 32.2 g. What is your percent yield? The arsenic in a 1.22 g sample of a pesticide was converted to AsO 4 3 by suitable chemical treatment. It was then titrated using Ag + to form Ag 3 AsO 4 as a precipitate. A What is the oxidation state of As in AsO 4 3? B If it took 25.0 ml of 0.102 M Ag + to reach the equivalence point in this titration, what is the mass percentage of arsenic in the pesticide?
The reaction below is used to produce methanol: O (g) + 2 2 (g) 3 O (!) rxn = 128 kj A. alculate the bond energy, given the bond enthalpy date in the table. B. What is the hybridization of the in the reactant? In the product?. What is the maximum wavelength of the photon needed to break the bond in O? Bond D/kJ/mol O 1072 436 =O 614 O 358 347 = 620 O 463 onsider the chemicals shown below: O O MgI 2 l O A. Which are strong electrolytes? B. 10 g of one of these compounds is dissolved in 100 g if water (density = 1 g/ml). The freezing point of the water is now 10. Which of the above compounds was used? (K f = 1.86 /m). 10g of a solute is dissolved in 100g of water and the temperature changes as indicated on the phase diagram to the right. Is the dissolution process endothermic or exothermic? 60 80 D. ow much energy is involved in this process? Assume a specific heat of 4.186 J/g. Temperature E. If ethanol has a! vap of 38.6 kj/mol how many moles of ethanol must be evaporated to cool down the above solution by 20? Pressure
onsider the molecules shown below. A. Rank them in terms of increasing boiling point. B. Rank them in terms of increasing vapor pressure.. Rank them in terms of increasing solubility in water. D. A sample of one of these compounds was burned and found to produce 1.08 g 2 0 and 5.28 g O 2. Which of the above compounds was burned? E. Does the burned compound display delocalized bonding? onsider the container shown (gas over water). 100 g 2 O Total volume = 1 L T = 65 Gas 2 O If we assume that the gas above the liquid contains 14 g N 2 and 16 g O 2, and the partial pressure of 2 O at 65 is 200 torr then: A. What is the partial pressure of N 2 and O 2 in this container? B. What would the total pressure of the system be at 20?. Is there more N 2 dissolved in the water at 65 or at 5?
onsider the three atoms fluorine, chlorine, and bromine: A. Assuming all of these are in the gas phase in their pure elemental form at the same temperature, rank the gases in terms of increasing density. B. If we make molecular compounds between each of these atoms and hydrogen: rank these compounds in order of increasing boiling point.. If we make ionic compounds between each of these atoms and lithium, rank these compounds in order of increasing melting point? A 2.50 g sample of benzoic acid (shown below) is completely combusted in air. What mass of O 2 will be collected in the analysis? A. 0.369 g O B. 0.779 g O. 1.11 g D. 1.72 g E. 6.31 g