Assessment Schedule 2016 Chemistry: Demonstrate understanding of the properties of organic compounds (91391)
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1 NCEA Level 3 Chemistry (91391) 2016 page 1 of 6 Assessment Schedule 2016 Chemistry: Demonstrate understanding of the properties of organic compounds (91391) Evidence Statement Q Evidence Achievement Achievement with Merit Achievement with Excellence ONE (a) Two correct. (b) 1. Hydroxyl (alcohol). 2. Amine / amino. 3. Amide / peptide. 4. Carboxylic acid. Three correct.
2 NCEA Level 3 Chemistry (91391) 2016 page 2 of 6 (c)(i) Attempts to draw two 3-D structures but with careless error ONE correct 3-D structure. TWO correct 3-D images. Glycine. It does NOT have a chiral C, i.e. it needs four different groups around the central C atom, glycine only has three. Glycine plus one relevant statement. Glycine plus explanation of chiral / asymmetric carbon. (iii) Dipeptides: Correct peptide linkage shown, but the structure is incorrect. One correct dipeptide. Both dipeptides are correctly shown. (iv) Condensation. Two larger molecules are joined together with the elimination of a smaller molecule. Correct reaction type explanation. Correct reaction type AND explanation. (v) Acidic hydrolysis leaves COOH group intact and NH 2 group becomes protonated to form NH + 3. H 3 N + CH(CH 3 )COOH H 3 N + CH 2 COOH Recognises COOH forms, but incorrect structure Recognises NH 3 + formed. Correct structure for one amino acid AND a partial explanation Correct hydrolysis products given. Correct hydrolysis products given, with explanation. NØ N1 N2 A3 A4 M5 M6 E7 E8 No response; no relevant evidence 1a 2a 4a 6a 3m 4m 1e + 3m 2e
3 NCEA Level 3 Chemistry (91391) 2016 page 3 of 6 Q Evidence Achievement Achievement with Merit Achievement with Excellence TWO (a)(i) Sodium borohydride / NaBH 4 (accept LiAlH 4 ) Correct name or formula of reagent. Correct name or formula of reagent. Pentanal will produce a primary alcohol / pentan-1-ol. CH 3 CH 2 CH 2 CH 2 CH 2 OH Pentan-2-one will produce a secondary alcohol / pentan-2-ol. EITHER one correct classification one correct structure. AND Both alcohols classified. AND Both structures are correct.
4 NCEA Level 3 Chemistry (91391) 2016 page 4 of 6 (b)(i) A: Propan-1-amine. (1-propanamine) B: Propanal. C: Propanoyl chloride. D: Propan-2-one. (propanone) THREE correct names. A: Propan-1-amine (a primary amine) CH 3 CH 2 CH 2 NH 2 (propan-1-amine) will turn moist red litmus paper blue as it is basic. CH 3 CH 2 CH 2 NH 2 + H 2 O CH 3 CH 2 CH 2 NH OH Water: Dissolves in water. Benedict s solution will stay blue as primary amines do not react with Benedict s reagent. B: Propanal (An aldehyde) Damp Litmus: No colour change. Water: Dissolves in water. Propanal will react with Benedict s reagent, with the blue solution forming a (copper mirror) / brick red precipitate. Propanoic acid is formed. CH 3 CH 2 CHO CH 3 CH 2 COOH C: Propanoyl chloride (An acyl chloride) Damp Litmus: Turn blue litmus red Water: Propanoyl chloride will react vigorously with water to produce propanoic acid and hydrogen chloride. CH 3 CH 2 COCl + H 2 O CH 3 CH 2 COOH + HCl Benedict s solution will stay blue as the acyl chloride does not react with the Benedict s, but instead reacts with the water present in the Benedict s solution. Correct reagent chosen for two substances with incomplete observations. ONE substance correctly identified with equation. TWO substances from A, B and C correctly identified with accurate observations. TWO correct equations. All FOUR substances are correctly identified, with accurate observations and ONE correct equation. All chemicals are correctly identified with accurate observations. AND TWO appropriate symbol equations given. D: Propan-2-one (A ketone) CH 3 COCH 3 (propan-2-one) Damp Litmus: No colour change. Water: Dissolves in water. Benedict s solution: No reaction, so stays blue. NØ N1 N2 A3 A4 M5 M6 E7 E8 No response; no relevant evidence 1a 2a 3a 4a 2m 3m 1e with minor error / omission 1e
5 NCEA Level 3 Chemistry (91391) 2016 page 5 of 6 Q Evidence Achievement Achievement with Merit Achievement with Excellence THREE (a) Structures: S1: CH 3 COOCH 2 CH 2 CH 3 S2: CH 3 CH 2 CH 2 OH Any THREE correct structures. At least SEVEN correct including ONE fully correct reagent. All structures and reagents correct. S3: CH 3 CH=CH 2 S4: CH 3 CH 2 CH 2 Cl Any ONE fully correct reagent. S5: CH 3 CH(Cl)CH 3 S6: CH 3 COCl S7: CH 3 CONHCH 2 CH 2 CH 3 Reagent 1 = H 2 O / H + (dilute acid) Reagent 2 = conc. H + (H 2 SO 4 or H 3 PO 4 ) Reagent 3 = NH 3 (alc) or conc. (b) Step 1: Butan-1-ol to but-1-ene. Dehydration reaction (elimination reaction) using conc H 2 SO 4. ONE correct reagent. Workable scheme, with at least one fully correct reagent. All correct with full understanding. ONE correct conversion step. Step 2: But-1-ene to butan-2-ol. Hydration reaction (addition reaction) using dil. H 2 SO 4 (H + /H 2 O) Step 3: Butan-2-ol (Major product) to butan-2-one. Oxidation reaction of secondary alcohol to from a ketone using Cr 2 O 7 2 / H + under reflux. Other workable scheme are possible.
6 NCEA Level 3 Chemistry (91391) 2016 page 6 of 6 (c)(i) One of these groups circled: Ester functional group indicated. ONE correct product for hydrolysis reaction. All THREE products correct. NØ N1 N2 A3 A4 M5 M6 E7 E8 No response; no relevant evidence 1a 2a 4a 5a 2m 3m 2e BOTH with minor error / omission 2e ONE with a minor error / omission 2e Cut Scores Not Achieved Achievement Achievement with Merit Achievement with Excellence
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