Zadanie 1a
Determine the molecular formula and the empirical formula of cresolphthalein.
- Materiał graficzny
Chemistry SL Paper 2, May 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 19 zadań z tego arkusza, razem 50 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Empirical and molecular formulas (2), Avogadro's law and molar volume of gases (2), Limiting reactant and theoretical yield (2).
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Dodaj cały arkusz do zestawuZadanie 1b
Cresolphthalein is manufactured from 2-methylphenol, CH3C6H4OH. State an equation that shows 2-methylphenol acting as a Brønsted–Lowry acid.
- Materiał graficzny
Zadanie 2
The kinetic molecular theory describes matter as particles in constant motion. State and explain two physical properties of a gas using this model.
Zadanie 3a
An equilibrium mixture in a 25.0 dm3 reactor at 500 °C contains 15.0 mol N2, 22.5 mol H2 and 5.25 mol NH3. Calculate the equilibrium constant, K, for the reaction.
Zadanie 3b
The volume of the reactor containing the equilibrium mixture described in 3a is suddenly increased at constant temperature. Sketch, on the axes below, how the concentration of hydrogen changes with time until the new equilibrium is established.
- Materiał graficzny
Zadanie 4a
State the IUPAC name of compound Y.
Zadanie 4b
Calculate the percentage by mass of hydrogen in compound Y, giving your answer to four significant figures. Use section 7 of the data booklet.
Zadanie 4c
Draw the structural formula of one structural isomer of compound Y.
Zadanie 4d
Compound Y undergoes nucleophilic substitution with a hydroxide nucleophile. (i) Describe the movement of electron pairs during the reaction using curly arrows. (ii) Contrast homolytic and heterolytic fission of the C–Cl bond in compound Y. (iii) Explain,…
Zadanie 5a
90.0 cm3 of buta-1,3-diene and 150.0 cm3 of hydrogen are mixed in a container at 450 K and 101 kPa and react to form butane only. Determine the maximum volume of butane that can be formed, measured at the same temperature and pressure.
Zadanie 5b
Determine the total volume of gas present in the container at the end of the reaction described in 5a, under the same conditions of temperature and pressure.
Zadanie 6a
Sodium ions are produced at the anode from the sodium atoms stored in the hard carbon. (i) State the half-equation for the reaction occurring at the anode while the battery discharges. (ii) The battery is rechargeable. Annotate the diagram below to show the…
- Materiał graficzny
Zadanie 6b
Suggest why banks of sodium-ion batteries are often installed alongside wind turbines.
- Materiał graficzny
Zadanie 7a
(i) State the electron configuration of a nitrogen atom. (ii) Draw the Lewis formula of ammonia. (iii) Deduce the electron domain geometry and the molecular geometry of the ammonia molecule. (iv) Explain why the ammonia molecule is polar.
Zadanie 7b
Nitrogen dioxide reacts with rain water and oxygen to form nitric acid. (i) State an equation for this reaction, including state symbols. (ii) Explain, with reference to the oxidation states of two elements, why this is a redox reaction. (iii) Describe the…
Zadanie 7c
Nitric acid can form hydrogen bonds with water. Annotate the structures below to show the formation of a hydrogen bond between a molecule of nitric acid and a molecule of water. Use a dotted line to represent the hydrogen bond.
- Materiał graficzny
Zadanie 7d
Discuss the melting points in the table below in terms of the bonding and/or intermolecular forces present in each substance.
- Tabela do uzupełnienia
Zadanie 8a
(i) State the equation for the formation of glucose by photosynthesis. (ii) Outline two advantages of using biobutanol rather than petrol (gasoline) as a fuel for vehicles.
Zadanie 8b
Calculate the rise in temperature of 400.0 cm3 of water heated by the complete combustion of 2.00 g of butan-1-ol, assuming that all the energy released is transferred to the water. Use sections 2 and 14 of the data booklet.