Zadanie 1a
Outline one reason why SO2 is considered a pollutant.
Chemistry SL Paper 2, November 2025, TZ3
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 17 zadań z tego arkusza, razem 50 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Reacting masses, volumes and concentrations (2), Nucleophilic substitution of halogenoalkanes (2), Isotopes and relative atomic mass (2).
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Dodaj cały arkusz do zestawuZadanie 1b
A sample of flue gas has a volume of 2.5 × 10−3 m3 at 150 °C and 1.2 × 105 Pa, and contains 0.20 % SO2 by volume. Using sections 1 and 2 of the data booklet, calculate the amount, in moles, of SO2 present.
Zadanie 1c
Sulfur dioxide can also be removed from flue gas by reaction with hydrogen peroxide, forming sulfuric acid. SO2(g) + H2O2(aq) → H2SO4(aq) Deduce which element is reduced in this process, indicating the initial and final oxidation states.
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Zadanie 2a
(i) In aqueous solution sulfuric acid transfers a proton to a water molecule, forming the hydroxonium ion, H3O+. Annotate the structure of the hydroxonium ion to indicate the coordination bond. (ii) Write an equation for the reaction between excess…
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Zadanie 2b
(i) For the carbonate ion, draw its Lewis formula. (ii) Write the chemical formula of ammonium carbonate.
Zadanie 3a
(i) If the reaction has a percentage yield of 80 %, calculate the mass, in g, of benzene that would be produced from 2.0 kg of cyclohexane. (ii) Calculate the atom economy for this reaction, as a percentage.
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Zadanie 3b
The forward reaction is endothermic, uses platinum as a catalyst, and takes place at 800 K. Sketch the reaction's energy profile both with and without the catalyst present, labelling the activation energies and ΔH.
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Zadanie 3c
(i) Sketch the Maxwell–Boltzmann distribution curve for 298 K on the same axes as the 800 K curve. (ii) On the graph, annotate the position corresponding to the activation energy, Ea. (iii) With reference to the graph, explain why a lower…
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Zadanie 3d
Hex-1-ene, CH2=CHCH2CH2CH2CH3, is used to manufacture poly(hex-1-ene). (i) Complete the diagram to show the repeating unit of poly(hex-1-ene). (ii) State the type of polymerization that occurs.
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Zadanie 3e
A compound used to make polymers, hexanedioic acid, can be produced by a series of reactions starting from cyclohexane. (i) Deduce how reactant A is related to hex-1-ene. (ii) For the C=O functional group present in intermediate C, state its structural…
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Zadanie 3f
Hexanoic acid, CH3(CH2)4COOH, is a weak acid. The graph shows how the pH changes during the titration of a 20.0 cm3 aqueous solution of hexanoic acid with aqueous sodium hydroxide. (i) Deduce an expression for the equilibrium constant, K,…
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Zadanie 4a
State what type of reaction this is.
Zadanie 4b
Using curly arrows to show the movement of electron pairs, sketch the mechanism of this reaction.
Zadanie 4c
Determine the standard enthalpy change of the reaction, in kJ mol⁻¹. Use section 12 of the data booklet. Ignore interactions between ions and the solvent.
Zadanie 5a
Contrast the two isotopes in terms of atomic structure.
Zadanie 5b
Calculate the relative atomic mass of chlorine from the sample, giving your answer to two decimal places.
Zadanie 5c
(i) Deduce the condensed electron configuration of chlorine. (ii) Describe the bonding in a molecule of chlorine in terms of valence electrons. (iii) Explain why chlorine has a much lower boiling point than bromine, although both exist as simple diatomic…
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