DP Chemistry (last assessment 2024)
Question 20N.3.hl.TZ0.14a
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.3.hl.TZ0.14a |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
20N.3.hl.TZ0.14a
(a)
Doping of silicon increases the conductivity in semiconductors.
Describe the doping in p-type and n-type semiconductors.
[2]
Markscheme
p-type:
«small amount of» Group 13 element produces holes ✔
n-type:
«small amount of» Group 15 element adds extra electrons ✔
Award [1 max] for correct element type for p AND n OR p-type: “produces holes” AND n-type: adds extra electrons”.
Examiners report
The description of doping in p- and n-type semiconductors was well expressed and the majority scored both marks.