VCE Past Exam Questions
Search 14,316 indexed VCE questions and parts across 19 subjects. Filter by topic, year, sitting and paper, then open the original source.
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Section B, Question 5
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Question 5 (8 marks) In 2025, South Australia experienced a harmful algal bloom along its coast. Algae produce toxins hazardous to marine life and can cause health issues. Algae pr
Search excerpt only. Open the original question for exact equations and diagrams.Source: 2026 VCE (NHT) Chemistry examination (PDF, 2.83 MB)Section B, Question 5(a)Question part (a)
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a. Identify the chiral centre(s) on the DHPS molecule below using an asterisk(s). 1 mark HO OH SO3 – To develop strategies to reduce the algal blooms, Fred, a researcher, investiga
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b. State the new functional group in structure Y formed from structure X. 1 mark
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c. When trying to isolate structures X and Z, Fred needs to ensure that the isolated compound is pure and not a mixture. Explain why a melting point determination would not disting
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d. The DHPS reaction pathway shown on page 26 requires a protein-based enzyme. Fred found that the amino acid alanine, Ala, is part of the enzyme.
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i. Draw the expected structure of Ala in a neutral aqueous solution. 1 mark
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ii. The enzyme also contains the amino acid arginine, Arg. Both the Ala and Arg residues interact with DHPS in an aqueous solution. Discuss why the Arg residue has a stronger inter
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e. Fred is examining ways to reduce the size of the algal bloom by stopping the enzyme from functioning in the pathway. What could disrupt the functioning of an enzyme? 1 mark
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Question 6 (12 marks) Cinnamon is a spice commonly used around the world in cooking as well as in traditional and herbal medicine. It is made from the dried inner bark of the cinna
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a. Name one method that can be used to extract these natural plant compounds from the bark. 1 mark
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b. Using the HPLC chromatograms above, compare the relative amount of coumarin in samples V and W. Justify your response. 2 marks Compound Q has a molecular formula of C 9 H 8 O. S
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c. Select the two structures from structures 1–6 that can be excluded using the information from the IR spectrum. Justify your selections. 2 marks
Search excerpt only. Open the original question for exact equations and diagrams.Source: 2026 VCE (NHT) Chemistry examination (PDF, 2.83 MB)How to use ClassConnect past exam questions
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