DP Chemistry (first assessment 2025)

Test builder »

Question 19N.1B.SL.TZ0.b(ii)

Select a Test
Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.1B.SL.TZ0.b(ii)
Level SL Paper 1B Time zone TZ0
Command term Explain Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
19N.1B.SL.TZ0.b(ii)

Explain why the rate of reaction of limestone with nitric acid decreases and reaches zero over the period of five days.

[2]

Markscheme

acid used up
OR
acid is the limiting reactant ✔

concentration of acid decreases
OR
less frequent collisions ✔

NOTE: Award [1 max] for "surface area decreases" if the idea that CaCO3 is used up/acts as the limiting reactant” is conveyed for M1.

Do not accept “reaction reaches equilibrium” for M2.

Syllabus sections