chem1201-test-2-s2-2022

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Nov 24, 2024

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Studocu is not sponsored or endorsed by any college or university CHEM1201 Test 2 S2 2022 Chemistry 2 (Australian National University) Studocu is not sponsored or endorsed by any college or university CHEM1201 Test 2 S2 2022 Chemistry 2 (Australian National University) Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
ANU ID: ____________________ EXAMINATION Semester 2 – TEST 2 2022 CHEM1201 Semester 2 Chemistry 2 (TEST 2) This paper is 100 marks total Examination Duration: 150 minutes (in addition there is 15-minute upload time.) This is an open book exam, but not open to the internet. Answers are to be all your own work. Any evidence that you have copied material from any source will result in an academic integrity inquiry, which may result in penalties including an outright fail for this exam. A Periodic Table and Data Sheets will be provided. Instructions to students: The 40 multiple choice questions are accessed via Wattle. Please answer the short answer questions on the test paper or on the pre-printed answer book or on your device. Once the 2.5 hours has elapsed, you have 15-minutes to upload your answers (as one PDF document) to Wattle. Save and name your answer paper: u1234567_Your Name_Chem Test 2. Mark Ellison will be available via zoom (see last page) to answer any questions during the test. Question Mark Question Mark Q26/3 C1/3 Q27/2 C2/1 Q28/3 C3/2 Q29/2 C4/4 Q30/6 C5/3 Q31/5 C6/8 Q32/2 C7/3 Q33/7 C8/4 C9/2 Total SB/30 Total SC/30 Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 2 of 13 Section B: Organic Chemistry 30 marks Question 26 [3 marks] One of the compounds 1-5 has the 13 C NMR spectrum shown below. Draw a circle around the structure of the compound that corresponds to the spectrum. If you are using the answer book, give the number of the structure. O 1 2 3 4 OH OH O O O 5 Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
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2022 CHEM1201 TOPIC TEST 2 Page 3 of 13 Question 27 [2 marks] One of the compounds 6-9 has the 1 H NMR spectrum shown below. Draw a circle around the structure of the compound that corresponds to the spectrum. If you are using the answer book, give the number of the structure. O O O O O O 6 7 8 9 Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 4 of 13 Question 28 [3 marks] Use arrows to show the movement of electrons to complete the mechanism drawn below for the reaction of an alcohol with HBr. Question 29 [1+1=2 marks] (a) Draw a circle around the structure of one of the compounds 10-13 to show which one would be expected to have the highest boiling point. If you are using the answer book, give the number of the structure. (b) Write two words that explain your answer to the above question (part (a)). R R O R H .. .. H + R R O R H H + -H 2 O R R R + oxonium ion carbocation Br - R R Br R O 10 11 12 13 OH O Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 5 of 13 Question 30 [1+1+2+2=6 marks] One of the bromides would be expected to be the major product of the reaction shown below. Draw a circle around the structure of that product (1 mark) and explain your answer by naming the rule that describes this preference (1 mark), as well as by drawing the structure of the intermediate that would be involved in the formation of each product (2 marks), and by explaining in a few words which one of the intermediates would form more easily (2 marks). HBr Br + Br Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
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2022 CHEM1201 TOPIC TEST 2 Page 6 of 13 Question 31 [5 marks] Explain why phenol has a p K a of around 10, whereas the p K a of ethanol (CH 3 CH 2 OH) is around 16. Your answer should be illustrated with at least one equation and at least two resonance contributors. Question 32. [2 marks] Use a few words to briefly explain the chemical basis of why polyamide carpets are more durable (resistant to degradation or less likely to break down) than those made from polyesters. OH phenol Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 7 of 13 Question 33 [7 marks] Draw a reaction scheme showing the reagents and intermediate products required to carry out the following transformation. More than one reaction will be required. + O O OH Br Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 8 of 13 Section C: Inorganic and Transition Metal Chemistry 30 marks Question C1 [3 marks] SeO 2 reacts with water to form H 2 SeO 3 . Draw a plausible mechanism for this reaction. In general terms, what type of compound is H 2 SeO 3 ? Question C2 [1 mark] Ionisation energies generally increase going from left to right across the periodic table. Very briefly explain why this is. Question C3 [2 marks] The ionisation energy of B, however, is less than that of Be. Explain why this is. Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
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2022 CHEM1201 TOPIC TEST 2 Page 9 of 13 Question C4 [4 marks] Draw the d xy and d x2–y2 orbitals on the axes provided below. Label the axes and show on your diagram where the ligands in a square planar complex are located. If you are using the answer booklet please copy the axes into your answer booklet. Question C5 [3 marks] Draw all possible isomers of diiodidobis(ethylenediamine)zinc(II). Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 10 of 13 Question C6 [3+2+1+2=8 marks] Draw a labelled d-orbital energy diagram for the metal ion in the following complex. Label the d-orbitals and include correctly positioned d-electrons. Give the systematic name, molar conductivity and crystal field stabilization energy for this complex. Systematic name: Molar conductivity: Crystal Field Stabilisation energy: Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 11 of 13 Question C7 [3 marks] What is the spin of the following complex? What would you expect its magnetic susceptibility to be? Spin: Magnetic susceptibility: Question C8 [1+2+1=4 marks] An octahedral complex absorbs light at 593 nm. What colour will it appear? What is the energy required to excite one electron from the t 2g orbitals to the e g orbitals? Question C8 continues on the next page Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
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2022 CHEM1201 TOPIC TEST 2 Page 12 of 13 What is the energy difference between the t 2g orbitals and e g orbitals in one mole of this complex? Question C9 [1+1=2 marks] Iron(III) forms a complex with the empirical formula FeCl 3 . Suggest a possible structure for this complex. Briefly explain why you have drawn this structure. Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319
2022 CHEM1201 TOPIC TEST 2 Page 13 of 13 Mark Ellison is inviting you to a scheduled Zoom meeting. Topic: Test 2 Time: Nov 10, 2022 09:00 AM Canberra, Melbourne, Sydney Join Zoom Meeting https://anu.zoom.us/j/89152303964?pwd=RnRKZkZrTW4yQVlmYVZ2 L2FFZHhVZz09 Meeting ID: 891 5230 3964 Password: 743480 END OF EXAMINATION Downloaded by Timothy Handoko (hantimo210@gmail.com) lOMoARcPSD|23633319