DP Chemistry (first assessment 2025)
Question 22M.1A.SL.TZ2.12
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1A.SL.TZ2.12 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | State | Question number | 12 | Adapted from | N/A |
12.
[Maximum mark: 1]
22M.1A.SL.TZ2.12
What is the main interaction between liquid CH4 molecules?
A. London (dispersion) forces
B. Dipole–dipole forces
C. Hydrogen bonding
D. Covalent bonding
[1]
Markscheme
A
Examiners report
56% of the candidates were able to identify London (dispersion) forces as the main interaction between liquid CH4 molecules. Covalent bonding was the most commonly chosen distractor. Good performance on this question correlated well with candidates who scored well overall.
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.8—The nature of the force that exists between molecules is determined by the size and polarity of the molecules. Intermolecular forces include London (dispersion), dipole-induced dipole, dipole–dipole and hydrogen bonding. Deduce the types of intermolecular force present from the structural features of covalent molecules.