DP Chemistry (last assessment 2024)

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Question 19N.2.sl.TZ0.b

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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

Automobile air bags inflate by a rapid decomposition reaction. One typical compound used is guanidinium nitrate, C(NH2)3NO3, which decomposes very rapidly to form nitrogen, water vapour and carbon.

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”.

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