| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.sl.TZ2.9 |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Identify | Question number | 9 | Adapted from | N/A |
Question
A chemical reaction occurs when a phospholipid is heated with excess sodium hydroxide.
Glycerol is one product of the reaction. Identify the two other organic products.
Identify the type of reaction which occurs.
Markscheme
C17H31COONa
[(CH3)3NCH2CH2OH]OH
Accept “NaC17H31COO”.
Accept “(CH3)3N+CH2CH2OH OR [(CH3)3NCH2CH2OH]+” if positive charge is shown.
Accept suitable names (eg, sodium linoleate, choline hydroxide etc.) OR correct molecular formulas.
[2 marks]
hydrolysis
Accept “nucleophilic substitution/displacement / SN/SN2 /saponification”.
Do not accept “acid hydrolysis”.
[1 mark]
Examiners report
Syllabus sections
-
18M.3.sl.TZ1.6c.i:
State the name of the process used to break down the insulin protein into its constituent amino acids.
- 16N.3.sl.TZ0.9a: State the raw materials and source of energy used in the process described above.
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17N.3.sl.TZ0.9a:
Describe what is meant by a condensation reaction.
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18M.3.sl.TZ2.6a:
Identify the type of chemical reaction that occurs between fatty acids and glycerol to form lipids and the by-product of the reaction.
- 18N.3.sl.TZ0.5a: The formation of proteins from amino acids is an example of an anabolic reaction in the human...
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17M.3.sl.TZ1.13a:
Identify the type of metabolic process that occurs in the hydrolysis of the peptide during digestion.
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19M.3.sl.TZ2.7a(ii):
Identify the type of reaction in (a).
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19M.3.hl.TZ2.11a(ii):
Identify the type of reaction in (a).
-
19M.3.hl.TZ1.8b:
Formulate the equation for the complete hydrolysis of a starch molecule, (C6H10O5)n.
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17M.3.sl.TZ1.12c.ii:
Biodegradable boxes made from polylactic acid, PLA, disintegrate when exposed to water.
State the formula of the product formed when water reacts with PLA.
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19M.3.sl.TZ1.7b:
Formulate the equation for the complete hydrolysis of a starch molecule, (C6H10O5)n.
