Chem. 1C Final Practice Test 1

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1 Chem. 1C Final Practice Test 1 First initial of last name Name Perm Number All work must be shown on the exam for partial credit. Points will be taken off for incorrect or no units. Calculators are allowed. Cell phones may not be used for calculators. On fundamental and short answer problems you must show your work in order to receive credit for the problem. If your cell phone goes off during the exam you will have your exam removed from you. Fundamentals (of 72 possible) Problem 1 (of 16 possible) Problem 2 (of 10 possible) Problem 3 (of 16 possible) Problem 4 (of 26 possible) Multiple Choice (of 60 possible) Extra Credit (of 5 possible) Final Total (of 200 possible) 1

2 Fundamental Questions Each of these fundamental chemistry questions is worth 6 points. You must show work to get credit. Little to no partial credit will be rewarded. Make sure to include the correct units on your answers. 1) 6 pts [Fe(H 2 O) 6 ] 3+ absorbs light =700. nm. What is the value (in ) of Δ o and what color will the complex appear? 2) 6 pts The table below lists information about the radioactive decay of three nuclides. Fill in the missing information. Nuclide Decay Mode Daughter Nuclide Beta Emission Positron Emission 3) 6 pts Match the functional group with the letter of the corresponding molecule. secondary amine primary alcohol carboxylic acid ester aldehyde ether 2

3 4) 6 pts Are the following paramagnetic or diamagnetic? You must show your work to get credit. [CoF 6 ] 3- [Co(CN) 6 ] 3- [Co(CN) 4 ] - 5) 6 pts Draw the Lewis structure, identify the bond angles, molecular shape, and determine if the structure is polar or nonpolar for the following modules: SF 4 IBr 3 6) 6 pts Determine the hybridization of all O and C atoms in the compound below and circle all chiral carbons. 3

4 7) 6 pts A wooden boat discovered just south off the Great Pyramid in Egypt has a carbon-14/carbon-12 ratio that is 72.4% of that found in living organisms. How old is the boat? (The half-life of carbon-14 is 5730yr.) 8) 6 pts Determine the products of the following reaction and name the products of the reaction. + H 2 O + 9) 6 pts What types of solids are the following? (list multiple if applicable) SiO 2 : CH 4 : NaOH: Ru: 10) 6 pts Which has the highest vapor pressure? H 2 O CH 3 CH 2 OH CH 3 CH 2 OCH 2 CH 3 Which of the following liquids freezes at the highest temperature benzenee methanol carbon tetrachloride Which of the following has the highestt surface tension? CH 4 HF C 2 H 6 Which of the following liquids will be the most viscous? C 3 H 8 C 2 H6 CH 4 4

5 11) 6 pts The vapor pressure of ammonia at several different temperatures is shown in the table. Use the data to determine the heat of vaporization and normal boiling point of ammonia? Temperature (K) Pressure (torr) ) 6 pts Calculate the energy release per gram of 7 Li for the following reaction: 7 Li + 1 H 2 4 He , , and 5

6 Short Answer Questions Each of the following short answer questions are worth the noted points. Partial credit will be given. You must show your work to get credit. Make sure to include proper units on your answer. 1a) 8 pts Krypton crystallizes with a face-centered cubic unit cell with side of 559 pm in length. What is the density of solid krypton in? 1b) 8 pts What percentage of krypton s unit cell is empty space if each atom is treated as a hard sphere? 6

7 2) 10 pts The binding energy per nucleon for magnesium-27 is Calculate the atomic mass of magnesium-27. 7

8 3a) 8 pts What is the boiling point of an aqueous solution that is 5.5% by mass NaNO 3. 3b) 8 pts If a new aqueous NaNO 3 solution (not necessarily 5.5% by mass) has a vapor pressure of torr at 25 C, what is the freezing point of the solution? 8

9 4a) 5 pts Draw and name all of the structural isomers of C 3 H 5 Br. Circle any structure that can have geometric isomers. 4b) 4 pts Propose an addition polymer that can form using one of your structural isomers as the monomers. Draw the structure of the polymer. 4c) 6 pts 100. g of the polymer in part b was mixed with enough water to make 500. ml of solution. If the osmotic pressure of the solution is 5.07 atm at 25 C what is the average molar mass of the polymer? 4d) 4 pts How many monomers constitute the average molecule? 4e) 7 pts What would be the vapor pressure of the solution if the vapor pressure of pure water at 25 C is atm? Assume the density of the solution is (Assume that the polymer has negligible vapor pressure.) 9

Multiple Choice Questions Each of the following multiple choice questions are worth 5 points. Your answers need to be filled in on your ParSCORE form.

On the ParSCORE you need to fill in your perm number, test version, and name. Failure to do any of these things will result in the loss of 1 point.

10 Multiple Choice Questions Each of the following multiple choice questions are worth 5 points. Your answers need to be filled in on your ParSCORE form. Note: Your ParSCORE forms will not be returned to you, therefore, for your records, you may want to mark your answers on this sheet. On the ParSCORE you need to fill in your perm number, test version, and name. Failure to do any of these things will result in the loss of 1 point. Your perm number is placed and bubbled in under the ID number. Do not skip boxes or put in a hyphen. In addition, leave bubbles blank under any unused boxes. The version number (A) is bubbled in under the test form. 1. The phase diagram for a pure substance is given below. The substance is stored in a container at 150 atm at 25 C. Describe what happens if the container is opened at 25 C. A) The solid in the container melts. B) The vapor in the container escapes. C) The solid in the container sublimes. D) The liquid in the container freezes. E) None of the above 2. isomers and isomers are classes of structural isomers. A) Geometric, linkage B) Coordination, linkage C) Geometric, optical D) Linkage, geometric E) Coordination, geometric 10

11 Use the following to answer question 3: When the U-235 nucleus is struck with a neutron, the Ce-144 and Sr-90 nuclei are produced, along with some neutrons and beta particles. 3. How many beta particles are emitted? A) 5 B) 2 C) 3 D) 4 E) None of the above 4. Which of the following statements is true of the fission of uranium-235? A) The nuclides produced are individually heavier than the uranium nuclide. B) The ultimate nuclides produced are more stable than the uranium nuclide. C) two of these D) The electron is captured by the nucleus, which becomes unstable. E) The products include neutrons. 5. Which types of processes are likely when the neutron-to-proton ratio in a nucleus is too large? I. decay II. decay III. positron production IV. electron capture A) II, III B) III, IV C) II only D) I, II E) None of the above 6. In the molecular-orbital description of CO, A) six molecular orbitals contain electrons. B) there are two unpaired electrons. C) the bond order is 3. D) the highest energy electrons occupy antibonding orbitals. E) All of these are false. 11

12 7. What is the complementary nucleic acid sequence for the DNA sequence CAC TAC CTT GGC? A) GTG ATG GAA CCG B) CCC AAG GGG TTG C) CAC TAC CTT GGC D) TCA CCA TGC CTA E) CGA GTG CAT CAG 8. Consider the following four compounds: Which of these compounds would have the same physical properties (melting point, boiling point, density, and so on)? A) I and IV B) II and III C) III and IV D) I and II E) I and III 9. For which of the following diatomic molecules would the bond order become greater if an electron were removed, that is, if the molecule were converted to the positive ion in its ground state? A) F 2 B) P 2 C) B 2 D) Na 2 E) C 2 12

13 10. When one mole of trans-tetraamminedichlorocobalt(iii) chloride dissolves in water, how many moles of ions does it produce? A) 1 mole of ions. B) 2 moles of ions. C) 3 moles of ions. D) 4 moles of ions. E) None of the above 11. A polypeptide is A) a part of nucleic acids. B) an addition polymer of amino acids. C) a condensation polymer of amino acids. D) a polymer of sugar molecules. E) None of the above 12. A solution of two liquids, A and B, shows negative deviation from Raoult's law. This means that A) molecules of A interact more strongly with B than with A or and more strongly than B with B. B) molecules of A interact strongly with other A-type molecules. C) the molecules of A hinder the strong interaction between B molecules. D) the two liquids have a positive heat of solution. E) molecules of A interact weakly, if at all, with B molecules. 13

Chem 1C Midterm 2 Practice Test 1

Chem 1C Midterm 2 Practice Test 1 First initial of last name Name Perm Number All work must be shown on the exam for partial credit. Points will be taken off for incorrect or missing units. Calculators