Enthalpy & Calorimetry Investigations for H2 Chemistry Paper 4

Study guide28 Oct 2025, 00:00 ZUpdated 17 Jul 2026

Reviewed by

Azmi·Senior Chemistry Specialist

Q: What does Enthalpy & Calorimetry Investigations for H2 Chemistry Paper 4 cover?
A: A step-by-step thermochemistry routine for Paper 4-planning insulation, logging temperature data with probes, linearising cooling curves, and writing ACE commentary that meets SEAB’s 2026 assessment expectations.

TL;DR
Paper 4 lasts 2 h 30 min, carries 50 marks, and contributes 20% of the H2 Chemistry grade (Planning 4%; MMO/PDO/ACE 16% combined) under SEAB's 2026 syllabus/specimen set (9476). Thermochemistry investigations (solution, neutralisation, combustion, thermometric titration) are explicitly listed in the Paper 4 practical scope.
Calibrate probes, insulate reaction vessels, capture temperature-time data for extrapolated ΔT, and automate $q = mc\Delta T$ calculations so ACE discussion focuses on heat losses, assumptions, and realistic refinements.

Concrete example: If the post-mixing line is cooling, extend it back to the mixing time and use that extrapolated temperature, not the later recorded maximum or minimum, for $\Delta T$ .

Status: SEAB's current H2 Chemistry (9476) syllabus PDF is labelled for 2026, and the 9476/04 specimen paper is labelled for examination from 2026. Paper 4 is 2 h 30 min, 50 marks, weighted at 20% with Planning at 4% and MMO/PDO/ACE at 16% combined.[1][2]

Sources

Add Eclat Institute as a Preferred Source on Google.

Practise this in a lab

Compare current lesson timings, pricing, and venues for the practical programme that matches this guide.

View H2 Chemistry Practicals (Labs & Experiments)

Practical course record and certificate note

Eclat keeps centre-held attendance records and may issue an internal attendance or completion document based on participation and internal assessment.

For SEAB private-candidate declarations, the centre record is the key evidence. Any Eclat completion document is not an MOE or SEAB qualification or accreditation.

Time / s	Temperature / deg C	Before mix	After mix	Use in extrapolation
0	24.8	yes	no	Pre-mixing best-fit line
30	24.9	yes	no	Pre-mixing best-fit line
60	25.0	mixing time	mixing time	Read extrapolated values here
90	31.8	no	yes	Post-mixing best-fit line
120	31.4	no	yes	Post-mixing best-fit line
150	31.1	no	yes	Post-mixing best-fit line

Step	Good practice	Purpose
Probe/thermometer calibration	Run ice-water (0 °C) and boiling-water $≈100 ^{\circ}C$ checks; record offsets in the logbook.	Documents instrument accuracy for ACE discussion.
Insulation setup	Nest two polystyrene cups, add lid with probe slot, surround with foam mat or lab towel.	Reduces heat exchange with surroundings.
Baseline logging	Start recording 1-2 minutes before mixing; stir gently to reach equilibrium.	Confirms starting temperature stability.
Mixing and timing	Add reagents quickly, replace lid immediately, stir at constant rate.	Minimises exposure; ensures uniform temperature distribution.
Continuous recording	Capture readings every 1-2 s until temperature peaks then returns toward ambient.	Provides data for Newton’s Law extrapolation.
Post-run checks	Rinse probe, inspect for spills, and note any evaporation or splashing.	Supports MMO marks and later evaluation.

Enthalpy & Calorimetry Investigations for H2 Chemistry Paper 4

Sources

Practise this in a lab

Quick win box

Fast answer: heat-loss correction by extrapolation

1 | Why thermochemistry stays in rotation

2 | Planning for controlled energy transfers

3 | MMO routines for reliable temperature capture

4 | Spreadsheet analysis and cooling-curve linearisation

5 | Worked neutralisation sequence (example)

6 | ACE commentary checklist

7 | Rapid readiness audit

8 | Next actions

9 | References

Structural references (2D)

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