R1 Reactivity 1: What drives chemical reactions?

Practice questions on Reactivity 1: What drives chemical reactions?

• Explain why bond enthalpy data gives only an approximate value for the standard enthalpy o… (4 marks, Explain)
• Explain why the standard enthalpy of combustion of octane (C₈H₁₈) is a negative value, and… (4 marks, Explain)
• Explain why the standard enthalpy of combustion of propane (C₃H₈) is more negative than th… (4 marks, Explain)
• Explain why the standard enthalpy of atomisation of a metal is always a positive value, an… (4 marks, Explain)
• Explain why the enthalpy change of combustion of methane determined experimentally using a… (4 marks, Explain)
• Explain why dissolving ammonium nitrate, NH₄NO₃(s), in water produces a solution that feel… (4 marks, Explain)
• Explain why the experimental value of the enthalpy change of neutralisation measured using… (4 marks, Explain)
• Explain why the standard enthalpy of combustion of hydrogen is considered a more environme… (4 marks, Explain)
• A student measures the enthalpy change of combustion of ethanol by burning it beneath a co… (4 marks, Explain)
• Explain why the electron affinity of chlorine is exothermic whilst the second electron aff… (4 marks, Explain)
• Explain why the enthalpy change of solution measured when sodium hydroxide, NaOH(s), disso… (4 marks, Explain)
• Explain why the lattice enthalpy of magnesium oxide (MgO) is much greater in magnitude tha… (4 marks, Explain)
• Using the concept of an enthalpy cycle, explain why the standard enthalpy of formation of … (4 marks, Explain)
• Explain why the first ionisation energy of sodium is endothermic and why it is much lower … (4 marks, Explain)
• Explain why the complete combustion of ethanol releases more energy than the complete comb… (4 marks, Explain)