LET’S TRY ONE
A reaction forms 24 mL of gas in 6 s. What is its average gas-production rate over that interval?
4 mL/s
24 mL ÷ 6 s = 4 mL/s.
Learning steps & teaching tips
Use stated controlled comparisons and measured amounts per time to evaluate a reaction-rate claim.
- Identify the independent variable and the measured response.
- Calculate an average rate where the data allow it.
- Check repeats and competing changed variables before making a causal claim.
Try it together
Design a paper-only trial table for temperature and gas volume. Hold the other conditions fixed, add repeated runs and state what the model can test.
Compare trials that isolate the named factor, and define rate as the measured change per unit time.