DP Chemistry (first assessment 2025)
Question 19M.2.SL.TZ1.8a
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.SL.TZ1.8a |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Draw | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
19M.2.SL.TZ1.8a
(a)
Draw a circle around the functional group formed between the amino acids and state its name.
Name:
[2]
Markscheme
Name:
amide/amido/carboxamide [✔]
Note: Accept “peptide bond/linkage”.
Examiners report
Many candidates correctly circled the bond between the amino acid residues, though in some cases their circle missed out key atoms. Many correctly identified it as a peptide or amide linkage.
Syllabus sections
Structure 3. Classification of matter » Structure 3.2—Functional groups: Classification of organic compounds » Structure 3.2.3—A homologous series is a family of compounds in which successive members differ by a common structural unit, typically CH2. Each homologous series can be described by a general formula. Identify the following homologous series: alkanes, alkenes, alkynes, halogenoalkanes, alcohols, aldehydes, ketones, carboxylic acids, ethers, amines, amides and esters.