A-LevelChemistryChemical energetics9701/12 · May/June 2021 · Q81 Mark

Nitrogen and oxygen can react together to form nitrogen monoxide, NO. N₂ + O₂ ⇌ 2NO ΔH = +180 kJ mol⁻¹ What is the bond energy of the bond between the atoms in NO?

A630 kJ mol⁻¹

B810 kJ mol⁻¹

C1260 kJ mol⁻¹

D1620 kJ mol⁻¹

✓ Correct answer

A: 630 kJ mol⁻¹

Oracle Prep sorts past-paper questions by topic, so you can drill Chemical energetics and see which topics are most likely to come up next.

Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 8.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

The following data are needed for this question. NaHCO3(s) + HCl(aq) → NaCl(aq) + H2O(l) + CO2(g) ΔH = -38.97 kJ m…

A reaction between carbon and oxygen is shown. C(s) + ½O2(g) → CO(g) How can the standard enthalpy change of this rea…

In this experiment you will determine the enthalpy change, AH, for the catalytic decomposition of hydrogen peroxide i…

The equation for the reaction between silver chloride and aqueous ammonia is shown. AgCl(s) + 2NH3(aq) ⇋ [Ag(NH3)2]+(…

Sodium azide, NaN3, decomposes as shown. 2NaN3 → 2Na + 3N2 Which volume of nitrogen, measured at room temperature and…

1.8 g of water, heated to 227 °C in a sealed container, turns to steam with a pressure of 200 kPa. What is the approx…