Chemistry HL Paper 3, May 2024, TZ2

Chemia IBPaper 3, maj 2024, TZ2wzorowane3 pktotwarteśrednie (szac.)

Zadanie 1a

State one method that could be used to follow the progress of this reaction and explain how its measurements allow the rate, in mol dm⁻³ s⁻¹, to be determined.

Chemia IBPaper 3, maj 2024, TZ2wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 1b

The concentration of hydrogen peroxide in a reaction mixture was followed for 600 s and the results are plotted in the graph. (i) Determine the instantaneous rate of the reaction, to two significant figures, when [H₂O₂] = 0.160 mol dm⁻³.…

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Chemia IBPaper 3, maj 2024, TZ2wzorowane4 pktotwarteśrednie (szac.)

Zadanie 2a

(i) The ideal PMI, which corresponds to the greenest possible process, is 1. Estimate the ideal value of each of the other three metrics. (ii) Identify the metric in the table that cannot be affected by the choice of solvent. (iii) Suggest one reason why the…

Chemia IBPaper 3, maj 2024, TZ2wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 2b

Two methods of making ethyl ethanoate are compared using the Eco-Scale. The penalty points are given in the table. Method 1: ethanoic acid reacts with ethanol, with concentrated sulfuric acid as the catalyst. The mixture is heated in a microwave reactor for 40…

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Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktobliczeniowełatwe (szac.)

Zadanie 4a

Ethenyl ethanoate, CH₃COOCH=CH₂, is the monomer of poly(ethenyl ethanoate). One industrial route makes it from ethene, ethanoic acid and oxygen: $\ce{C2H4(g) + CH3COOH(g) + 1/2O2(g) -> CH3COOCH=CH2(g) + H2O(g)}$ Calculate the percent atom economy for…

Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 4d

The infrared (IR) spectrum of a sample of a polymer used in wood adhesives is shown. Deduce the bonds in the polymer that are responsible for peaks A and B. Use section 20 of the data booklet.

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Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 6a

The amino acids glycine and alanine react together to form a dipeptide. Identify the type of bond that joins the two amino acid residues in the dipeptide.

Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 7d

Pantothenic acid (vitamin B5) is added to some processed foods. Its structure is shown. Predict, giving one reason, whether pantothenic acid is soluble in vegetable oil.

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Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 12b

Bioethanol is made from the sugars that plants produce by photosynthesis. Write the balanced summary equation for photosynthesis, in which glucose is formed.

Chemia IBPaper 3, maj 2024, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 13b

Cyclopentane is a component of petrol. Its specific energy, the energy released per kilogram of fuel burned, is 4.69 × 10⁷ J kg⁻¹. Calculate the enthalpy of combustion of cyclopentane, C₅H₁₀, in kJ mol⁻¹. Use…

Chemia IBPaper 3, maj 2024, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 14c

Lidocaine and procaine are local anaesthetics. Their structures are shown. Deduce the name of one functional group that is present in both molecules and the name of one functional group that is present in procaine only.

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Chemia IBPaper 3, maj 2024, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 16a

A single dose of an antacid tablet contains 1.850 g of sodium hydrogencarbonate, NaHCO₃, and 0.600 g of calcium carbonate, CaCO₃. Stomach acid is hydrochloric acid. M_r(NaHCO₃) = 84.01 and M_r(CaCO₃) = 100.09 Determine the amount of…

Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktotwarteśrednie (szac.)

Zadanie 18a

3-Methylcyclohexanol is a cyclic alcohol. Draw circles around all chiral carbon atoms in the structure.

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Chemia IBPaper 3, maj 2024, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 20a

Identify one absorption range in the IR spectrum of propanoic acid that is not present in the IR spectrum of propan-1-ol. Use section 20 of the data booklet.

Chemia IBPaper 3, maj 2024, TZ2wzorowane2 pktotwarteśrednie (szac.)

Zadanie 20b

A sample is known to be either propan-1-ol or propanoic acid. Its ¹H NMR spectrum is shown. (i) Deduce, giving a reason, whether the sample is propan-1-ol or propanoic acid. Use section 21 of the data booklet. (ii) Predict, giving a reason, the splitting…

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