DP Chemistry (first assessment 2025)
Question 19N.2.SL.TZ0.b
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.2.SL.TZ0.b |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Formulate, Suggest | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19N.2.SL.TZ0.b
Another airbag reactant produces nitrogen gas and sodium.
Suggest, including an equation, why the products of this reactant present a safety hazard.
[2]
Markscheme
2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) ✔
hydrogen explosive
OR
highly exothermic reaction
OR
sodium reacts violently with water
OR
forms strong alkali ✔
NOTE: Accept the equation of combustion of hydrogen.
Do not accept just “sodium is reactive/dangerous”.
Syllabus sections
Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.4—Trends in properties of elements down a group include the increasing metallic character of group 1 elements and decreasing non-metallic character of group 17 elements. Describe and explain the reactions of group 1 metals with water, and of group 17 elements with halide ions.