Zadanie 1a
Hydrochloric acid, HCl(aq), and hydroiodic acid, HI(aq), ionize completely in water, whereas propanoic acid, CH3CH2COOH(aq), ionizes only partly. 25.0 cm3 of 0.200 mol dm−3 HCl(aq) was titrated with sodium…
Chemistry HL Paper 2, May 2026, TZ2
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
Dodaj cały arkusz do zestawuZadanie 1b
Sulfapyridine is an antibacterial drug. Its structure is shown below. C11H11N3O2S Mr = 249.32 (i) Deduce the hybridization of the nitrogen atom that is part of a ring. (ii) Describe how the sigma (σ) and pi (π) components of an…
- Materiał graficzny
Zadanie 2a
Iodine crystals, I2(s), were sealed in a flask and left until an equilibrium was reached with violet vapour above the crystals. I2(s) ⇌ I2(g) (i) Name the change of state from I2(s) to I2(g) and state the type of force between…
Zadanie 2b
An ‘iodine clock’ experiment can be based on two reactions that occur at the same time. S2O82−(aq) + 2 I−(aq) → 2 SO42−(aq) + I2(aq) slow 2 S2O32−(aq) + I2(aq) → S4O62−(aq) + 2 I−(aq) fast The iodine formed in the slow reaction is removed at…
Zadanie 2c
Use the position of selenium in the periodic table to outline what is known about the electron configuration of its atoms. Give one piece of information from the group number and one from the period number.
Zadanie 3a
(i) Describe the structure of solid magnesium and state the forces that hold it together. (ii) Explain why a piece of magnesium can be hammered into a new shape without breaking. (iii) Explain why the melting point of magnesium is higher than that of sodium.…
Zadanie 3b
An alloy of magnesium and aluminium is used for car wheels and laptop casings. (i) Suggest why adding aluminium produces a material that is harder and less malleable than magnesium alone. (ii) Suggest why a magnesium alloy is a good choice for the casing of a…
Zadanie 3c
Sodium reacts vigorously with water. (i) Write an equation, with state symbols, for the reaction of sodium with water. (ii) Describe one observation from the reaction in (i). (iii) Sketch, on the axes below, an energy profile for this reaction. Label the…
- Materiał graficzny
Zadanie 4a
Compound X is a flavour compound that occurs in many plants. Its structure is shown below. (i) State the IUPAC name of compound X. (ii) State the name of the functional group represented by the C=O bond itself in compound X. (iii) Predict the size of the H–C=O…
- Materiał graficzny
Zadanie 4b
1-Bromobutane, CH3CH2CH2CH2Br, is used as a solvent and as a building block for other organic compounds. (i) Predict the organic compound produced from 1-bromobutane and hydroxide ions. (ii) Deduce the type of reaction in (i) and give a reason for your…
Zadanie 4c
Methane reacts with bromine gas in the presence of UV radiation to produce brominated hydrocarbons. (i) Explain, using an equation, how a bromine molecule undergoes homolytic fission. (ii) Using two equations, explain the propagation steps in the substitution…
Zadanie 4d
Propene can be reduced to propane by hydrogen gas in the presence of a platinum catalyst at 50 °C. Outline how the catalyst increases the rate of this reaction.
Zadanie 4e
Ethene reacts with water in the presence of an acid catalyst at room temperature. C2H4(g) + H2O(l) → C2H5OH(l) ΔH⊖ = −44 kJ mol−1 (i) Calculate the change in entropy, ΔS⊖, for this reaction in…
Zadanie 5a
State the overall reaction of the cycle and determine its enthalpy change, in kJ mol−1.
Zadanie 5b
Use bond enthalpies to calculate the enthalpy change, in kJ mol−1, for the first reaction. Br ∙ (g) + O3(g) → BrO ∙ (g) + O2(g) Use section 12 of the data booklet and the table below.
- Tabela do uzupełnienia
Zadanie 6a
Deduce the order of reaction with respect to NO and with respect to Cl2, and write the rate equation.
Zadanie 6b
Calculate the rate constant, k, for this reaction at this temperature, including its units, using one row of the table.
Zadanie 6c
Outline how the activation energy, Ea, of this reaction could be found, without describing the apparatus or the procedure.
Zadanie 7a
Outline what type of bond joins a ligand to the nickel ion and how this bond forms.
Zadanie 7b
Explain the origin of the colours of the nickel complexes.