Students were set a challenge by their teacher to produce a chemical clock measuring a 20 s time interval. They used an opaque solution that became transparent, allowing a black cross to become visible after 20 s.
The students investigated the effect of temperature on their results and plotted a graph.
In this type of experiment 1/t (where t is time) may be used as a measure of the rate of reaction.
Calculate the rate at 15°C to a suitable number of significant figures.
Include units in your answer.
(3)
(1)
Evaluate the students' results and decide whether it is necessary to repeat their experiments.
State how you would change the conditions to make this chemical clock measure 40 s at 22 °C.
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