# Journal Prompt: Trusting the Numbers in a Calorimetry Lab

Every calorimetry experiment produces a number, but not every number deserves your full confidence.

**Suppose you burned a peanut to heat a known mass of water and calculated the molar enthalpy of combustion using Q = mcΔt ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23634)), then compared your result to the accepted value and found it was 40% too low. Write a journal entry explaining where the heat likely went, and what a real experimenter does with a result like this.**

### Where to start:

- What assumptions does Q = mcΔt make about where the heat goes ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23634))?
- In a real calorimeter, what happens to heat that never reaches the water?
- How does an open flame near a peanut, rather than an enclosed calorimeter, change your error sources ([Resource](https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/9ykNTynh306g6EnZlkTITQ))?
- Would a polystyrene-cup calorimeter reduce this error, and why ([Resource](https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/0uxhxD914kqzmssVwCK4tg))?

### Stretch:

Using ΔH notation, write both the theoretical and experimental enthalpy values for your reaction as signed quantities ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23638)), and explain in one sentence why the sign matters even when the magnitude is wrong ([Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23636), [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23641)).

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*AILI prompt · language en · model claude-sonnet-5 · generated 2026-09-17 · id 00e7b136-0f04-4e49-8c9e-da3aab9e8606*

### 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/23634)
- 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/23636)
- resource:r1: Resources › type#activity › SCN3796 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/9ykNTynh306g6EnZlkTITQ)
- 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/23638)
- node:n7: Chemistry › Chemistry (20, 30) › Chemistry 30 › Unit A: Thermochemical Changes (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/23633)
- resource:r2: Resources › type#activity › SCN3796 (https://goa-cc-uat-aili-app-001.azurewebsites.net/library/resource/0uxhxD914kqzmssVwCK4tg)