DP Chemistry (last assessment 2024)
Question 20N.2.hl.TZ0.3c
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.2.hl.TZ0.3c |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Justify, Predict | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
20N.2.hl.TZ0.3c
An equation for the combustion of propane is given below.
C3H8(g) + 5O2(g) 
3CO2(g) + 4H2O(g)
(c)
Predict, giving a reason, whether the entropy change, , for this reaction is negative or positive.
[1]
Markscheme
positive AND more moles «of gas» in products ✔
Examiners report
Most knew that entropy increased however some lost the mark by not including an explanation based on increase number of mol of gaseous products.
