DP Chemistry (last assessment 2024)

Test builder »

Question 18M.2.hl.TZ1.5b

Select a Test
Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.hl.TZ1.5b
Level hl Paper 2 Time zone TZ1
Command term State Question number b Adapted from N/A
b.
[Maximum mark: 1]
18M.2.hl.TZ1.5b

Limescale, CaCO3(s), can be removed from water kettles by using vinegar, a dilute solution of ethanoic acid, CH3COOH(aq).

(b)

Dissolved carbon dioxide causes unpolluted rain to have a pH of approximately 5, but other dissolved gases can result in a much lower pH. State one environmental effect of acid rain.

[1]

Markscheme

Any one of:

corrosion of materials/metals/carbonate materials

destruction of plant/aquatic life

«indirect» effect on human health

 

Accept “lowering pH of oceans/lakes/waterways”.

[1 mark]

Syllabus sections