Name the process used to: (a) produce ammonia from nitrogen .......................................................................................................................................... (b) produce lead from molten lead(II) bromide .......................................................................................................................................... (c) separate an insoluble solid from a mixture of an insoluble solid and a solution .......................................................................................................................................... (d) produce ethanol from ethene .......................................................................................................................................... (e) identify the components of a mixture of soluble coloured substances .......................................................................................................................................... (f) separate a mixture of several liquids with different boiling points .......................................................................................................................................... (g) determine the volume of an acid required to neutralise a given volume of an alkali. ..........................................................................................................................................
Exam No：0620_s24_qp_43 Year：2024 Question No：1
Answer:
Knowledge points:
11.5.1. State that the bonding in alkenes includes a double carbon–carbon covalent bond and that alkenes are unsaturated hydrocarbons
11.5.2. Describe the manufacture of alkenes and hydrogen by the cracking of larger alkane molecules using a high temperature and a catalyst
11.5.3. Describe the reasons for the cracking of larger alkane molecules
11.5.4. Describe the test to distinguish between saturated and unsaturated hydrocarbons by their reaction with aqueous bromine
11.5.5. State that in an addition reaction only one product is formed
11.5.6.1. bromine or aqueous bromine
11.5.6.2. hydrogen in the presence of a nickel catalyst
11.5.6.3. steam in the presence of an acid catalyst and draw the structural or displayed formulae of the products
12.2.1.1. burette
12.2.1.2. volumetric pipette
12.2.1.3. suitable indicator
12.2.2. Describe how to identify the end-point of a titration using an indicaton
12.4.1.1. a suitable solvent
12.4.1.2. filtration
12.4.1.3. crystallisation
12.4.1.4. simple distillation
12.4.1.5. fractional distillation
12.4.2. Suggest suitable separation and purification techniques, given information about the substances involved
12.4.3. Identify substances and assess their purity using melting point and boiling point information
4.2.1. State that a hydrogen–oxygen fuel cell uses hydrogen and oxygen to produce electricity with water as the only chemical product
4.2.2 Describe the advantages and disadvantages of using hydrogen–oxygen fuel cells in comparison with gasoline / petrol engines in vehicles
9.6.1. Describe the ease in obtaining metals from their ores, related to the position of the metal in the reactivity series
9.6.2.1. the burning of carbon (coke) to provide heat and produce carbon dioxide
9.6.2.2. the reduction of carbon dioxide to carbon monoxide
9.6.2.3. the reduction of iron(III) oxide by carbon monoxide
9.6.2.4. the thermal decomposition of calcium carbonate / limestone to produce calcium oxide
9.6.2.5. the formation of slag Symbol equations are not required
9.6.3. State that the main ore of aluminium is bauxite and that aluminium is extracted by electrolysis
9.6.4.1.
9.6.4.2.
9.6.4.3.
9.6.4.4.
9.6.4.5.
9.6.5.1. the role of cryolite
9.6.5.2. why the carbon anodes need to be regularly replaced
9.6.5.3. the reactions at the electrodes, including ionic half-equations
Solution:
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