Zadanie 1a
Deduce the ionic equation, including state symbols, for the reaction of hydrogen bromide gas with water.
Chemistry SL Paper 2, May 2023, TZ1
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
Calculate the pH of 0.25 mol dm−3 hydrobromic acid.
Zadanie 1c
Explain why a solution of methanoic acid has a higher pH than hydrobromic acid of the same concentration.
Zadanie 1d
A pH probe can be used to distinguish between the two acids. Identify another simple instrumental method that could be used in a school laboratory to tell them apart.
Zadanie 1e
Outline how the method identified in part 1d distinguishes between the two acids.
Zadanie 2a
(i) Annotate and label the ground state orbital diagram of carbon below, using arrows to represent electrons. (ii) Sketch the shapes of the two types of occupied orbital identified in part (i) on the axes below, and state the orbital type for each.
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Zadanie 2b
Explain why the first ionization energy decreases from beryllium to barium in group 2.
Zadanie 2c
(i) State the electron domain geometry of the water molecule. (ii) Deduce the Lewis (electron dot) structure of water and sketch its 3D molecular shape. (iii) Explain, with reference to the forces between molecules, why water has a higher boiling point than…
Zadanie 2d
Sulfur trioxide is manufactured industrially by the oxidation of sulfur dioxide. 2 SO2(g) + O2(g) ⇌ 2 SO3(g) ΔH⊖ = −198.0 kJ mol−1 (i) Outline what is meant by dynamic equilibrium. (ii) Deduce the Kc expression for this…
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Zadanie 3a
Halogenoalkanes form a homologous series. (i) Outline the meaning of homologous series. (ii) State the preferred IUPAC name of each of the two compounds shown. (iii) But-1-ene can be polymerized. Draw a section of the resulting polymer showing two repeating…
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Zadanie 4a
State the oxidation state of manganese in the permanganate ion, MnO4−.
Zadanie 4b
A voltaic cell was constructed from an iron(II) sulfate/iron half-cell and a copper(II) sulfate/copper half-cell, connected by a salt bridge and, externally, by a wire. (i) Outline why electrons flow from the iron half-cell to the copper half-cell when the two…
Zadanie 5a
(i) Calculate the percentage of oxygen present in the double salt. (ii) Determine the empirical formula of the double salt. Use section 7 of the data booklet. (iii) The molar mass of the empirical formula is the same as the molar mass of the formula unit.…
Zadanie 5b
A 1.50 g sample of the double salt was dissolved in distilled water. Aqueous barium chloride was then added in excess, so that all the sulfate ions were precipitated as barium sulfate. (i) Formulate an ionic equation, including state symbols, for…
Zadanie 6a
Hydrogen sulfide, H2S, is removed from natural gas in the Claus process. Part of the hydrogen sulfide is burned in air to form sulfur dioxide, which then reacts with the remaining hydrogen sulfide to form sulfur. (i) Determine the enthalpy change, in…
Zadanie 6b
The enthalpy change of combustion of ethanol was investigated in a school laboratory. A spirit burner containing ethanol was used to heat water in a metal can. A total of 0.0250 mol of ethanol was burned. The following data were recorded. (i) Calculate the…
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