IGCSE CHEMISTRY SOLVED past paper 0620/42/O/N/22 - October / November 2022 Paper 42

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This video solves and explains Cambridge IGCSE Chemistry paper 42 October / November 2022.

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Intro: (00:00)
Question1: (00:11)
Diamond and graphite are different solid forms of carbon. The carbon atoms in diamond and
graphite are arranged in different ways.
(a) State the number of covalent bonds each carbon atom has in diamond.

Question2: (02:39)
Sodium is a reactive metal.
(a) Suggest why sodium is stored under oil.

Question3: (10:30)
Sulfuric acid is manufactured by an industrial process. Sulfur is obtained from sulfur-containing
metal ores.
The sulfur in the metal ore is converted to sulfur dioxide which is then oxidised to sulfur trioxide as
shown.
2SO2(g) + O2(g) 2SO3(g)
(a) Name a metal ore which contains sulfur.

Question4: (14:45)
A student prepares magnesium sulfate crystals, MgSO4, by adding excess magnesium to dilute
sulfuric acid.
(a) Write the chemical equation for this reaction.

Question5: (19:07)
Ethane is an alkane which undergoes a photochemical reaction with chlorine as shown.
C2H6(g) + Cl 2(g) → C2H5Cl(l) + HCl(g)
(a) Write the general formula of alkanes.

Question6: (22:30)
A carboxylic acid Y has the structure shown.
(a) State the general formula of carboxylic acids.
(b) Name carboxylic acid Y.
(c) Write the molecular formula of carboxylic acid Y.

Facebook page:

[DaniElle-jipb]

when drawing an ester is it a must to start with the carboxylic acid

[jomanaMohammedhassan]

in question 3(d)(iv) there's supposed to be 3 before the OH, 30H
in the ionic equation

[judymokhtar]

in 6 d can i give the hydrogen electrons another symbol other than dot and cross in order not to repeat

[TinkerBell-kzvs]

In 4ii shouldn't we divide to find mr 2.40÷120??