A-Level UK (AQA, Edexcel, OCR) · Chemistry

Energetics

5 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 5 questions

  1. In a calorimetry experiment, 50.0 g of water is heated by 6.0 K by burning 0.025 mol of fuel (c = 4.18 J g-1 K-1). What is the enthalpy of combustion?
  2. Enthalpies of combustion: C(s) -394, H2(g) -286, CH4(g) -890 kJ mol-1. What is the enthalpy of formation of methane, C + 2H2 -> CH4?
  3. Bond enthalpies: H-H 436, Cl-Cl 243, H-Cl 432 kJ mol-1. What is the enthalpy change for H2 + Cl2 -> 2HCl?
  4. A reaction has an enthalpy change of +40 kJ mol-1 and an entropy change of +120 J K-1 mol-1. At what temperature does it become feasible?
  5. What is the definition of the standard enthalpy of formation?

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