DP Chemistry (last assessment 2024)
Question 21N.2.hl.TZ0.a(i)
| Date | November 2021 | Marks available | [Maximum mark: 2] | Reference code | 21N.2.hl.TZ0.a(i) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Distinguish | Question number | a(i) | Adapted from | N/A |
a(i).
[Maximum mark: 2]
21N.2.hl.TZ0.a(i)
Hybridization of hydrocarbons affects their reactivity.
Distinguish between a sigma and pi bond.
[2]
Markscheme
Sigma (σ) bond:
overlap «of atomic orbitals» along the axial / intermolecular axis / electron density is between nuclei
OR
head-on/end-to-end overlap «of atomic orbitals» ✔
Pi (π) bond:
overlap «of p-orbitals» above and below the internuclear axis/electron density above and below internuclear axis
OR
sideways overlap «of p-orbitals» ✔
Accept a suitable diagram.
