VCE Past Exam Questions
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Section B, Question 6(d)Question part (d)
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d. The mass spectrum of compound Q, C 9 H 8 O, is shown below. 25 50 75 100 125 relative intensity m/z 0 20 40 60 80 100 Source: Adapted from NIST Chemistry WebBook <webbook.nist.g
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i. State the m/z value of the molecular ion peak. 1 mark
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ii. Suggest what fragment has been lost from compound Q to form the peak at m/z = 77. 1 mark
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e. The information from the low-resolution 1 H NMR spectrum for compound Q, C9 H 8 O, is shown below. Chemical shift (ppm) Integration curve 6.6 1 7.5–7.6 5 7.7 1 9.7 1 Source: Che
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i. What do the integration curve values of 1, 5, 1 and 1 indicate about the number of H atoms in each environment? 1 mark
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ii. Identify the type of proton that could be responsible for the peaks at 7.5–7.6 ppm in the low-resolution 1 H NMR spectrum. 1 mark
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iii. The high-resolution 1 H NMR spectrum shows that the peak at 9.7 ppm is a doublet. What information does this provide about the structure of the molecule? 1 mark
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f. The 13 C NMR spectrum above shows a single peak around 190 ppm. Name the class of compound responsible for the peak. Reference item 19 in the Data Book. 1 mark
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g. Use the information in parts c–f to identify which one of the structures from structures 1–6 on page 30 is compound Q, C 9 H 8 O. 1 mark
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Question 7 (16 marks) Compounds containing hydrogen, such as solid metal hydrides, are safe sources for generating hydrogen gas, H 2 (g), for use in fuel cells. There are various m
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a. Using the equation above, calculate the maximum theoretical amount of H 2 (g), in mol, produced from 150 mg of MgH 2 (s) (M = 26.3 g mol−1 ). 1 mark Amy conducted an experimenta
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b. Provide one safety reason for using a very small amount of MgH 2 (s) in Method A. 1 mark The graph below shows the data produced using Method A. 0.0 5.0 10.0 15.0 20.0 25.0 30.0
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