Question

the passage below describes an experiment. ten groups of chemistry students each combined three solutions that, when mixed, chemically reacted and turned blue. before mixing, five groups of students heated the solutions to 25°c, and the other five heated them to 50°c. each group stirred the mixture three times and then recorded how many seconds it took to turn blue. the groups shared their results and compared the time it took for the mixture to turn blue at 25°c and at 50°c. identify the question that the experiment can best answer. does the color change faster when the solutions are mixed at 25°c or 50°c? does the mixtures color change faster when stirred three times or when stirred five times?

Explanation:

The experiment has two groups with different temperatures (25°C and 50°C) and measures the time for the color - change. The key variable here is temperature. The first question focuses on the effect of temperature (25°C vs 50°C) on the rate of color change, which is directly related to the experiment's setup. The second question about stirring times (three vs five) is not relevant as the experiment only mentions stirring three times for all groups.

Answer:

Does the color change faster when the solutions are mixed at 25°C or 50°C?