Zadanie 1a
Determine the coefficients needed to balance the equation for the reaction between sodium and water. Na(s) + H2O(l) → NaOH(aq) + H2(g)
Chemistry SL Paper 2, May 2022, TZ2
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Dodaj cały arkusz do zestawuZadanie 1b
A 0.460 g piece of sodium was placed in 250.0 cm3 of water. (i) Calculate the molar concentration of the sodium hydroxide solution formed. Assume that the volume of the solution is 250.0 cm3. (ii) Calculate the volume of hydrogen gas…
Zadanie 1c
Identify the oxidizing agent in the reaction of sodium with water and justify your answer in terms of oxidation states.
Zadanie 1d
Describe two observations, other than the formation of gas bubbles, that would show that the reaction of sodium with water is exothermic.
Zadanie 2a
Explain why the first ionization energy of magnesium is greater than that of sodium.
Zadanie 2b
The diagram represents the electron energy levels in a hydrogen atom. (i) Suggest two features of the behaviour of electrons in atoms that this energy level model cannot explain or represent. (ii) Draw an arrow, labelled Z, on the diagram to represent the…
- Materiał graficzny
Zadanie 3a
Outline how the presence of the silver catalyst affects the rate of the reaction, and explain why.
Zadanie 3b
(i) On the axes below, sketch Maxwell–Boltzmann energy distribution curves for the methanol molecules at two temperatures, T1 and T2, where T2 > T1. (ii) Explain the effect of increasing the temperature on the equilibrium yield of methanal.
- Materiał graficzny
Zadanie 3c
(i) Methanal can be reduced. State the name of the organic product formed. (ii) Methanal can also be oxidized to methanoic acid, HCOOH, which is a weak Brønsted–Lowry acid. State the meaning of the term weak Brønsted–Lowry acid.
Zadanie 3d
(i) Draw the Lewis formula of methanal. (ii) Explain the electron domain geometry around the carbon atom in methanal.
Zadanie 4a
(i) Outline one way in which the bonding between carbon atoms in graphite differs from that in diamond. (ii) Explain why fullerene, C60, sublimes at a much lower temperature than graphite.
Zadanie 4b
State two features that justify placing ethene and propene in the same homologous series.
Zadanie 4c
Two colourless liquids in unlabelled bottles are cyclohexane and cyclohexene. Describe a chemical test, and the expected observation with each liquid, that would show which bottle contains cyclohexene.
Zadanie 4d
(i) Draw the full structural (displayed) formula of hex-3-ene. (ii) Write an equation for the addition of hydrogen bromide to hex-3-ene. (iii) State the type of reaction in (ii).
Zadanie 4e
Ethane reacts with iodine vapour. C2H6(g) + I2(g) → C2H5I(g) + HI(g) (i) Calculate the enthalpy change of the reaction, ΔH, using section 12 of the data booklet. (ii) Draw and label an enthalpy level diagram for this reaction on the axes below.
- Materiał graficzny
Zadanie 5a
Deduce the half-equation for the process at each electrode. Cathode (negative electrode): Anode (positive electrode):
Zadanie 5b
Deduce the equation for the overall reaction in the cell, including state symbols.