Energetics - A Level Chemistry

OCR H432 · 3.2.1

Specification Checklist

Tick each specification point as you cover or revise it. Your progress is saved on this browser.

0 / 8

complete

3.2.1(a) explanation that some chemical reactions are accompanied by enthalpy changes that are exothermic (∆H, negative) or endothermic (∆H, positive) 3.2.1(b) construction of enthalpy profile diagrams to show the difference in the enthalpy of reactants compared with products 3.2.1(c) qualitative explanation of the term activation energy, including use of enthalpy profile diagrams 3.2.1(d) explanation and use of the terms:
(i) standard conditions and standard states (physical states under standard conditions)
(ii) enthalpy change of reaction (enthalpy change associated with a stated equation, ∆_rH)
(iii) enthalpy change of formation (formation of 1 mol of a compound from its elements, ∆_fH)
(iv) enthalpy change of combustion (complete combustion of 1 mol of a substance, ∆_cH)
(v) enthalpy change of neutralisation (formation of 1 mol of water from neutralisation, ∆_neutH) 3.2.1(e) determination of enthalpy changes directly from appropriate experimental results, including use of the relationship: q = mc∆T 3.2.1(f) (i) explanation of the term average bond enthalpy (as the breaking of 1 mol of bonds in gaseous molecules)
(ii) explanation of exothermic and endothermic reactions in terms of enthalpy changes associated with the breaking and making of chemical bonds
(iii) use of average bond enthalpies to calculate enthalpy changes and related quantities (see also 2.2.2 f) 3.2.1(g) Hess’ law for construction of enthalpy cycles and calculations to determine indirectly:
(i) an enthalpy change of reaction from enthalpy changes of combustion
(ii) an enthalpy change of reaction from enthalpy changes of formation
(iii) enthalpy changes from unfamiliar enthalpy cycles 3.2.1(h) the techniques and procedures used to determine enthalpy changes directly and indirectly.

Energetics

Notes

Notes will be added here.

Topic notes can be added as they are produced during the course.

Energetics

Resources

READ

Cognito

Revision notes.

Enthalpy Changes ↗

PRACTISE

Physics & Maths Tutor

Exam questions by topic.

Enthalpy Changes ↗

WATCH

MaChemGuy

Teaching videos.

Enthalpy Changes ↗

Energetics

Quiz Me

Generate a 10-question set for flashcard-style retrieval practice. Think through your answer, then reveal the mark scheme.

- Best score

- Average score

0 Quizzes completed

Energetics

Exam Practice

Questions

Past-Paper Questions

Selected OCR Chemistry A questions on Energetics.

Open Questions ↗

Mark Scheme

Matching OCR Chemistry A mark scheme for the past-paper questions.

Open Mark Scheme ↗