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題組內容

25. This question is about ethene, C₂H₄, and ethyne, C₂H₂.

25b. Outline the formation of polyethene from ethene by drawing three repeating units of the polymer. [1 mark

其他申論題

23e. Calculate the percentage by mass of magnesium hydroxide in the 1.24 g antacid tablet to three significant figures. [1 mark]

24a. Identify the missing component of the cell and its function. [2 marks]

24b. Deduce the half-equations for the reaction at each electrode when current flows. [2 marks]

25a. Ethyne, like ethene, undergoes hydrogenation to form ethane. State the conditions required. [2 marks]

25c. Under certain conditions, ethyne can be converted to benzene. Determine the standard enthalpy change, ΔHΘ , for the reaction stated, using the data in the appendix. [2 marks] 3C2H2(g) → C6H6(g)

25d. Determine the standard enthalpy change, ΔHΘ , for the following similar reaction, using ΔHf values in the appendix. [2 marks] 3C2H2(g) → C6H6(l)

25e. Explain, giving two reasons, the difference in the values for 25c and 25d. If you did not obtain answers, use −475 kJ for 25c and −600 kJ for 25d. [1 marks]

25f. One possible Lewis structure for benzene is shown. State one piece of physical evidence that this structure is incorrect. [1 mark]

26a. Sketch a Maxwell–Boltzmann distribution curve for a chemical reaction showing the activation energies with and without a catalyst. [3 marks]

26b. Excess hydrochloric acid is added to lumps of calcium carbonate. The graph shows the volume of carbon dioxide gas produced over time. Sketch a curve on the graph to show the volume of gas produced over time if the same mass of crushed calcium carbonate is used instead of lumps. All other conditions remain constant. [1 mark]

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