Zadanie 1a
Outline why compound A cannot be a hydrocarbon.
Chemistry SL Paper 2, May 2024, 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
Determine the empirical formula of A.
Zadanie 1c
At 150.0 °C and a pressure of 1.00 × 105 Pa, the vapour of A has a density of 2.45 × 103 g m−3. Determine the molar mass of A and hence its molecular formula. Use sections 1 and 2 of the data booklet.
Zadanie 1e
When A is refluxed with excess acidified potassium dichromate(VI), K2Cr2O7, the product is compound E, whose molar mass is greater than that of A. From this information alone, identify one functional group in E.
Zadanie 2a
Give the full electron configuration of a nitrogen atom in its ground state and state how many of its electrons are unpaired.
Zadanie 2b
(i) Draw a Lewis (electron dot) structure of the nitrite ion. (ii) Predict the shape of the ion and the size of the O-N-O bond angle.
Zadanie 2d
Atmospheric carbon dioxide and the pH of surface seawater were measured at a monitoring station over nineteen years. The graph shows the annual mean values. (i) Outline the relationship between the carbon dioxide mixing ratio and the pH of the seawater. (ii)…
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Zadanie 3a
(i) State one environmental problem caused by acid rain. (ii) Write an equation for the reaction of sulfur trioxide, SO3, with water in the atmosphere, in which an acid forms.
Zadanie 3b
Potassium oxide, 0.0150 mol, was dissolved in water and the solution was made up to a final volume of 250.0 cm3. (i) Write a balanced equation for the reaction of potassium oxide with water. (ii) Calculate the pH of the solution.
Zadanie 3c
Hydrogen fluoride, HF, released by aluminium smelters, dissolves in water to form a weak acid. HF(aq) + H2O(l) ⇌ H3O+(aq) + F−(aq) (i) State the equilibrium constant expression, Kc, for this reaction. (ii) State, with a reason, the…
Zadanie 3d
Outline why the ionic radius of the sulfide ion, S2−, is greater than that of the chloride ion, Cl−.
Zadanie 4a
Suggest how the parts of the IUPAC name prop-2-enal match the structure of the compound.
Zadanie 4b
Butane, C4H10, and propenal have similar molar masses, yet propenal is the less volatile. Compare and contrast the intermolecular forces in the two substances to account for this difference.
Zadanie 4c
Propenal can be made by the dehydration of propane-1,2,3-triol (glycerol): CH2(OH)CH(OH)CH2OH(l) → CH2=CHCHO(g) + 2 H2O(g) Two related reactions were studied separately. Reaction 1:…
Zadanie 4e
20.0 cm3 of propane is mixed with 150.0 cm3 of oxygen and burnt completely. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) Determine the total volume of gas present once the products have cooled to the starting temperature and…
Zadanie 4f
State one reason why real gases such as butane and ammonia deviate more from ideal behaviour as the pressure increases.
Zadanie 4g
Butanone can be made by the oxidation of butan-2-ol. Butan-2-ol can be synthesised in two ways: from an alkene H by the addition of water, or from a halogenoalkane J by a substitution reaction with aqueous sodium hydroxide. Draw the structure of H and state…
Zadanie 5a
Outline why the estimated rate calculated from the preliminary experiment is not the initial rate of the reaction.
Zadanie 5b
The student then followed the reaction with a spectrophotometer, which records the light absorbed by the mixture and so gives the concentration of the dye throughout the reaction. The graph shows [D+] against time for experiment 3. (i) Use the graph to…
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Zadanie 6a
Molten potassium iodide is electrolysed. Write the half-equation for the reaction at each electrode: the positive electrode (anode) and the negative electrode (cathode).
Zadanie 6b
Potassium permanganate reacts with potassium iodide in alkaline solution. 6 MnO4−(aq) + I−(aq) + 6 OH−(aq) → 6 MnO42−(aq) + IO3−(aq) + 3 H2O(l) Identify the species oxidized and the number of electrons transferred in the equation as written.