Chemistry · BGCSE / Air, water and the environment
StructuredPast exam questionForm 5 · BGCSE
A student is given two samples of water: pure water, labelled Y, and rain water containing dissolved calcium hydrogencarbonate, labelled Z.
- aWrite the formula for calcium hydrogencarbonate. [1]
- bExplain how calcium hydrogencarbonate is dissolved in the water. [2]
- cState the observation when a few drops of soap solution are shaken with each sample, and explain. [3]
- dState the observation when a portion of each sample of water is boiled, and explain. [3]
- eState two properties which when determined can prove that sample Y is pure water. [2]
You'll mark your own answer against the marking guide when you hand it in.
Source: BEC BGCSE Chemistry 2011, Paper 3, Question 1(b)
Report a problem
More like this
- About what percentage of air is nitrogen?
- Which test shows that a liquid is water?
- Acid rain is mainly caused by…
- Water containing dissolved carbon dioxide reacts with limestone, CaCO₃, forming hard water as shown by the equation. H₂O(l) + CO₂(g) + CaCO₃(s) → Ca(…
- Nitrogen dioxide is one of the pollutants found in car exhaust fumes.
- Pollutant gases such as carbon monoxide and oxides of nitrogen are produced by a car engine and are emitted through the exhaust pipe.
- Carbon dioxide, nitrogen and oxygen are all present in clean air.
- Carbon monoxide is a poisonous gas emitted from car exhausts. It can be detected using the reaction: CO + Pd²⁺ (orange) + H₂O → CO₂ + Pd (black) + 2H…