Subsection 5.1. Enthalpy change, \(\Delta H\) for Chemistry, A Level - revisedeck

5.1. Enthalpy change, \(\Delta H\)

A subsection of Chemistry, 9701, through 5. Chemical energetics

Listing 10 of 305 questions

The table shows bond energies for some diatomic molecules. Deuterium, D, is an isotope of hydrogen. energy /kJmol–1 bond F–F Cl–Cl Br–Br I–I H–H D–D Which statements are correct?

9701_m23_qp_12

MCQ

2023

Paper 1, Variant 2

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The diagram shows the skeletal formula of cyclopropane. The enthalpy change of formation of cyclopropane is +53.3 kJ mol–1 and the enthalpy change of atomisation of graphite is +717 kJ mol–1. The bond enthalpy of H – H is 436 kJ mol–1 and of C – H is 410 kJ mol–1. What value for the average bond enthalpy of the C – C bond in cyclopropane can be calculated from this data?

9701_s14_qp_12

MCQ

2014

Paper 1, Variant 2

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Use of the Data Booklet is relevant to this question. The bond energy of the Br – O bond is 235 kJ mol–1. Which reactions are exothermic?

9701_w14_qp_11

MCQ

2014

Paper 1, Variant 1

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Use of the Data Booklet is relevant to this question. The bond energy of the Br – O bond is 235 kJ mol–1. Which reactions are exothermic?

9701_w14_qp_12

MCQ

2014

Paper 1, Variant 2

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Al Cl 3 vapour forms molecules with formula Al 2Cl 6 as it is cooled. What happens to the bond angles during the change from Al Cl 3 to Al 2Cl 6?

9701_s14_qp_11

MCQ

2014

Paper 1, Variant 1

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Questions Discovered

305