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

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Cambridge IGCSE Chemistry paper 22 October / November 2022, Solved and Explained.

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Introduction: (00:00)
Q 01: (00:11)
The rate of diffusion of three gases, ammonia, carbon dioxide and methane, is measured.
What is the order of the rate of diffusion of the gases from slowest to fastest?
Q 02: (00:57)
Which description of Brownian motion is correct?
Q 03: (01:37)
The chromatogram obtained using four substances, J, K, L and M, is shown.
Q 04: (02:31)
Which statements about isotopes of the same element are correct?
1 They are atoms which have the same chemical properties because they have the
same number of electrons in their outer shell.
Q 05: (03:18)
Which statement about solid magnesium oxide is correct?
Q 06: (04:25)
Which molecule contains only three shared pairs of electrons?
Q 07: (04:50)
Which particles are present in the structure of metals?
1 positive ions
2 negative ions
3 shared pairs of electrons
Q 08: (05:27)
Caffeine is a stimulant found in coffee.
Q 09: (05:58)
Which sample does not contain a number of atoms equal to the Avogadro constant?
Q 10: (09:33)
The electrolysis of concentrated aqueous sodium chloride and molten sodium chloride is shown.
Q 11: (10:44)
When an acid is added to an alkali, the temperature of the reaction mixture rises.
Which words describe this reaction?
Q 12: (11:07)
Some properties of four fuels are shown.
Which fuel is a gas at room temperature and makes two products when it burns in a plentiful
supply of air?
Q 13: (11:43)
The electrical energy, or voltage, of two simple cells is measured.
Q 14: (13:55)
Dilute aqueous sodium chloride is electrolysed using carbon electrodes.
What is the product at the anode?
Q 15: (14:23)
The volume of gas given off in a chemical reaction is measured over time.
The results are shown.
Q 16: (14:55)
Dinitrogen tetroxide, N2O4, is converted into nitrogen dioxide, NO2, in a reversible reaction.
The forward reaction is endothermic.
Q 17: (15:51)
When magnesium is heated with zinc oxide a reaction occurs.
The equation is shown.
Q 18: (16:15)
X and Y are oxides of two different elements.
● X reacts with water to produce aqueous solution Z.
● Z turns universal indicator paper blue.
Q 19: (17:12)
Ethanoic acid reacts with water to produce an acidic solution.
Which row describes the roles of ethanoic acid and water in this reaction?
Q 20: (17:34)
Copper(II) sulfate is a soluble salt.
Calcium sulfate is an insoluble salt.
Q 21: (19:10)
Strontium displaces magnesium from molten magnesium chloride.
Bromine displaces iodine from aqueous potassium iodide.
Q 22: (20:01)
Elements J and K are in the same period in the Periodic Table.
J reacts with acids to produce a salt and hydrogen.
K reacts with sodium to form an ionic compound.
Q 23: (21:14)
Part of the Periodic Table is shown.
Which element has a high density, a high melting point and forms a brown oxide?
Q 24: (21:46)
The reactions of four metals, W, X, Y and Z, are listed.
● Metal W displaces metal X from the oxide of metal X.
● Metal Y has a greater tendency to form positive ions than metal W.
Q 25: (23:14)
Three experiments, J, K and L, are set up to investigate rusting.
Q 26: (23:57)
Silver is below copper in the reactivity series.
Which row describes the reactions of silver?
Q 27: (24:23)
Iron is galvanised by coating it in zinc.
Brass is made by mixing copper with zinc.
Q 28: (25:09)
The diagram shows a stage in the purification of dirty water.
Q 29: (25:44)
Which substance in polluted air damages stonework and kills trees?
Q 30: (26:05)
Ammonium nitrate, NH4NO3, is a fertiliser and is added to fields to help crops grow.
Q 31: (26:51)
The scheme shows four stages in the conversion of sulfur to sulfuric acid.
In which stage is a catalyst used?
Q 32: (27:12)
Which element has an oxide that is used as a food preservative?
Q 33: (27:26)
Which substance gives off carbon dioxide on heating?
Q 34: (27:56)
Which compound has the most –CH2– groups in one molecule?
Q 35: (28:45)
Methane reacts with chlorine in the presence of ultraviolet light.
Which substance is not produced in this reaction?
Q 36: (29:25)
Ethene reacts with both hydrogen and steam.
Which row about these reactions is correct?
Q 37: (30:40)
Which type of reaction occurs when ethanol is converted to ethanoic acid?
Q 38: (30:56)
Hydrolysis of polymer P produces the three compounds shown.
Q 39: (32:00)
Which statement about unsaturated hydrocarbons is correct?
Q 40: (32:48)
The equation shows the formation of a polymer called Kevlar.