VERIFIED TEMPERATURE—
LAST ENDPOINT TIME—
Start with the water bath.
Race to the same color.
Change temperature. Time a fixed endpoint. Explain the difference.
Lab options
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YOUR MISSION
Does warming a reaction make it reach an endpoint sooner?
Compare a generic color-change reaction at 20, 30, and 40°C. Use three fresh mixtures at each temperature, and time each to the same color threshold.
Use the same formulations, 5.0 mL solution A and 5.0 mL initiator B, flask, mixing method, and endpoint rule. Equilibrate both aliquots and the flask in the bath before mixing; only the target temperature changes.
3 temperatures × 3 trialsSame color thresholdTimer display: 0.1 s
A generic numerical teaching model, not measured results for a named chemical recipe. Endpoint timing and mixing are automatic. The animation compresses the modeled time; your clicking speed is not measured.
What makes this a fair comparison?
Both aliquots and the flask reach the bath temperature before mixing. Keep the amount, formulation, mixing method, apparatus, and endpoint the same. Use fresh aliquots for every repeat and start the timer when B first contacts A.
The timer stops at the same modeled color threshold, corresponding to 80% conversion in this generic model. That is a consistent endpoint, not complete reaction. A shorter time means faster progress to that endpoint under these controlled conditions.
We also calculate a relative rate index, 1 ÷ endpoint time, in s⁻¹. It helps compare identical endpoint trials. It is not a concentration-change rate in mol/L/s and is not, by itself, a measured rate constant.
Recorded evidence
| Trial | Bath target (°C) | Measured (°C) | Endpoint time (s) | 1/time (s⁻¹) |
|---|
3 / EXPLAIN THE PATTERN
Which temperature reached the endpoint fastest?
Compare mean endpoint times, then connect the pattern to particle energy and effective collisions.
| Bath target | Fresh trials | Mean time | Observed range | Mean 1/time |
|---|
Ranges are the observed minimum–maximum endpoint times, not confidence intervals. The model does not imply that every reaction doubles in rate for each 10°C increase.
Help me explain my results
Measurements from your investigation
These are your recorded model results. Choose the evidence that supports your own conclusion.
- Make a claim.
- Use evidence.
- Explain the science.
- Set a limit.
Before downloading: Does your explanation answer the question, use a number with units, explain why, and state a limit? Revise it above if needed.
This guide does not write or grade your explanation. A teacher reviews your scientific reasoning.
Optional calculation: relative rate index
Choices and the optional calculation are checked automatically. A teacher reviews the scientific quality of your explanation.