required to completely react with 5.00 cm3 of 0.500 mol dm–3 of CuSO solution.
Question
Mathematics
Edexcel2023
(1)
(iii) Calculate the amount of NH , in moles, present in the volume of NH (aq) in (b)(ii).
Question
Mathematics
Edexcel2023
2 2 3 2
In order to maintain the correct percentage of oxygen in the air, any excess carbon
dioxide could be removed by using sodium oxide.
Na O + CO → Na CO
Question
Mathematics
Edexcel2023
2 2 3
(a) Calculate the mass of sodium oxide that would be required to remove the excess
carbon dioxide when exactly 880 g of sodium superoxide is reacted per day.
You can assume that an astronaut oxidises 2 mol of glucose each day.
(4)
2 2
The hydrogen peroxide solution reacted with exactly 24.85 cm3 of a 0.420 mol dm–3
solution of cerium(IV) ions, Ce4+.
Deduce the formula of the cerium ion present in the final solution. Support your
answer with a calculation.
(4)
(Total for Question 6 = 10 marks)
Question
Mathematics
Edexcel2023
200 mol of CO(g) and 0.400 mol of H (g) are mixed in a sealed container of volume
Question
Mathematics
Edexcel2018
An inorganic salt A contains one cation and one anion.
The results of two tests on salt A are shown in the table.
Test Observation
Add aqueous sodium hydroxide to solid A.
Warm the mixture. A gas was evolved.
Test any gas evolved with damp red The gas turned red litmus paper blue.
litmus paper.
Add dilute nitric acid followed by aqueous
A cream precipitate formed.
silver nitrate to an aqueous solution of A.
(a) Deduce the name of salt A.
(2)
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(b) Describe additional tests, with the results, that will confirm the identity of the
anion in the cream precipitate.
(2)
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(Total for Question 1 = 4 marks)
Question
Mathematics
Edexcel2018
mol dm−3
Cu2+(aq)
..............................................................
salt
..............................................................
bridge
(a) Complete the diagram by adding labels on the dotted lines provided.
(3)
(b) A salt bridge is used to connect the two half-cells.
(i) State what chemical is contained in the salt bridge.
(1)
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(ii) Give a possible reason why the salt bridge cannot be replaced by an
unreactive metal wire.
(1)
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