# Enthalpy Changes and Calorimetry

## Task

Students present a labelled model or report on enthalpy changes and calorimetry.

## Curriculum alignment

Students are assessed on their understanding of the following outcomes:

- Define enthalpy and molar enthalpy for chemical reactions ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23636))
- Recall the application of Q = mcΔt to the analysis of heat transfer ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23634))
- Use calorimetry data to determine the enthalpy changes in chemical reactions ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23641))
- Use and interpret ΔH notation to communicate and calculate energy changes in chemical reactions ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23638))

## Rubric

| Criterion | Beginning | Developing | Proficient | Exemplary |
|---|---|---|---|---|
| **Conceptual Understanding of Enthalpy** | Identifies enthalpy or molar enthalpy with incomplete or incorrect definitions ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23636)). | Defines enthalpy and molar enthalpy with minor gaps or imprecision. | Defines enthalpy and molar enthalpy accurately and distinguishes between the two concepts. | Defines enthalpy and molar enthalpy precisely and explains their relationship to chemical reactions. |
| **Application of Heat Transfer Formula** | Attempts to use Q = mcΔt but with significant errors in variables or calculation ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23634)). | Uses Q = mcΔt with mostly correct variables; minor computational or unit errors present. | Applies Q = mcΔt correctly with proper variables, units, and calculations throughout. | Applies Q = mcΔt correctly and explains the role of each variable in determining heat transfer. |
| **Calorimetry Data Analysis** | Collects or interprets calorimetry data with major gaps; minimal connection to enthalpy determination ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23641)). | Collects or interprets calorimetry data with minor errors; shows partial connection to enthalpy calculation. | Analyzes calorimetry data accurately and determines enthalpy changes with correct methodology. | Analyzes calorimetry data accurately, determines enthalpy changes, and evaluates experimental precision or sources of error. |
| **ΔH Notation and Communication** | Uses ΔH notation inconsistently or with incorrect signs; communication is unclear ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23638)). | Uses ΔH notation with mostly correct signs and units; communication is generally clear. | Uses ΔH notation correctly with proper signs, units, and values; communication is clear and organized. | Uses ΔH notation correctly and explains the significance of sign and magnitude in interpreting reaction thermochemistry. |

## Scoring

Assign each criterion a level: Beginning (1), Developing (2), Proficient (3), or Exemplary (4). Sum the four scores to obtain a total out of 16.

- 13 to 16: Excellent
- 10 to 12: Good
- 7 to 9: Satisfactory
- 4 to 6: Needs improvement

## Notes for the teacher

- Ensure students label all variables in calculations (m, c, ΔT, Q) and show unit cancellation to verify dimensional analysis.
- Accept both endothermic and exothermic reactions; check that the sign of ΔH matches the direction of heat flow (negative for exothermic, positive for endothermic).
- If assessing a model, require clear labelling of the calorimeter components, reactants, and thermometer placement; verify that the model reflects the experimental procedure from [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23647).
- For reports, require students to identify their data source (experimental measurement, literature value, or simulated data) and explain any discrepancies between expected and observed enthalpy values.

---
*AILI marking guide · language en · model claude-haiku-4-5-20251001 · generated 2026-09-17 · id 0ecd6b96-4c2b-460e-9427-42bd3ae7ed55*

### Sources

- node:n1: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23636)
- node:n2: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23634)
- node:n3: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23641)
- node:n4: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23647)
- node:n5: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23634)
- node:n6: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23636)
- node:n7: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23638)
- node:n8: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes › General Outcome 1 (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23648)
- resource:r1: Resources › type#activity › SCN3796 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/0uxhxD914kqzmssVwCK4tg)