Final answer:
When the student does not stop the timer as soon as bubbling stops during a test at 40°C, errors can occur in the measurements and reaction time.
Step-by-step explanation:
When the student does not stop the timer as soon as bubbling stops during a test at 40°C, several errors can occur:
- Measurements at all temperatures will have errors because the timer was not stopped accurately.
- The reaction time will be too long because the timer keeps running even after the reaction has ended.
- The reaction time will resemble the reaction time for a higher temperature because the reaction continues to be timed even after it has stopped.