Chemistry SL Paper 2, November 2023, TZ2

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 1a

Outline the meaning of the term “homologous series”, with reference to the carboxylic acids.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 1b

Draw a Lewis (electron dot) structure of ethanoic acid, CH₃COOH.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane2 pktobliczeniowełatwe (szac.)

Zadanie 1c

Calculate the mass percentage of oxygen in ethanoic acid.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane6 pktotwarteśrednie (szac.)

Zadanie 1d

Ethanoic acid and propanone, CH₃COCH₃, both contain a carbonyl group and have similar molar masses. (i) Explain, in terms of the strongest intermolecular forces present in each liquid, why propanone boils at a much lower temperature than ethanoic acid.…

Chemia IBPaper 2, listopad 2023, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 2a

Explain why there has been so much recent research into this process.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 2b

State the expression for K_c for this reaction.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 2c

Bond enthalpies give an estimate of the enthalpy change of a reaction. Assume that all species are gases. (i) Use bond enthalpies from section 12 of the data booklet to determine the standard enthalpy change, ΔH^⊖, of the forward reaction. (ii)…

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 2d

Using your answer to part 2c(i), deduce how the value of K_c changes when the temperature is raised.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane4 pktotwarteśrednie (szac.)

Zadanie 2e

The conversion of carbon dioxide to methanol is usually carried out over a catalyst containing copper and zinc oxide. (i) Sketch energy profiles for the forward reaction, with and without the catalyst, on the axes shown. Label ΔH and the two activation…

• Materiał graficzny

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 2f

Determine the oxidation state of carbon in methanol, CH₃OH.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 3a

State the name of the reagent that is heated with propanoic acid to form this ester.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 3b

A student heated 3.85 g of propanoic acid with an excess of the second reagent and isolated 3.12 g of the ester. Determine the percentage yield.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 3d

State the class of organic compounds to which CH₃CH₂COOCH₃ belongs.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 3e

Draw the full structural formula of a carboxylic acid that is a structural isomer of the ester CH₃CH₂COOCH₃.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 3f

State the name of a compound that would form the carboxylic acid you drew in part 3e when it is heated under reflux with an excess of an oxidizing agent.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 4a

The enthalpy changes of two reactions of the gases involved are known: $\ce{COS(g) + 3/2O2(g) -> CO2(g) + SO2(g)}$   ΔH₁ = −548.8 kJ mol⁻¹…

Chemia IBPaper 2, listopad 2023, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 4b

Deduce the shapes of the CO₂ and H₂O molecules and explain why they differ.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane4 pktobliczenioweśrednie (szac.)

Zadanie 4c

Iron has a number of natural isotopes. A sample of iron was enriched in $\ce{^{58}Fe}$ to produce a mixture with the following composition: (i) Calculate the relative atomic mass of the enriched sample, giving your answer to two decimal places. (ii) Natural…

• Tabela do uzupełnienia

Chemia IBPaper 2, listopad 2023, TZ2wzorowane3 pktotwartełatwe (szac.)

Zadanie 5a

Aluminium is a low-density metal that is used in lightweight alloys. Aluminium is produced by the electrolysis of molten aluminium oxide (in industry dissolved in molten cryolite to lower the operating temperature). A simplified cell is shown in the diagram.…

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