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chemistry igcse acapprinted 144 · PDF 144
145 pagesrevision 46934
printed 144 · PDF 144
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450, 200000,iron
(ii) What would be the effect of the following on the yield of ammonia? [2]
Increasing pressure (Increased yield)
Increasing temperature (Decreased yield)
Increasing the concentration of ammonia (Decreased yield)
Increasing the catalyst (No change)
2. Hydrated copper(II) sulfate is a coloured compound. It exists as hydrated crystals which contain water
molecules.
(i) State the term given to water molecules present in hydrated crystals.
....................................................................................................................................... [1]
Water of crystallisation
(ii) State the colour of hydrated copper(II) sulfate crystals.
....................................................................................................................................... [1]
Blue
(iii) Write the formula of hydrated copper(II) sulfate.
....................................................................................................................................... [2]
CuSO4.5H2O
3. Sulphuric acid is made by the Contact process in the following sequence of reactions.
sulphur sulphur dioxide sulphur trioxide sulphuric acid
(a)
(i) How is sulphur dioxide made from sulphur? [1]
By burning sulphur in air
(b) The equation for a stage of the Contact process is 2SO2 + O2 ⇌ 2SO3. The percentage of sulphur trioxide in
the equilibrium mixture varies with:
(i) How does the percentage of sulphur trioxide in the equilibrium mixture vary as the
temperature increases? Circle the correct answer.