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Procedure Sequence and Reproducibility
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ACT Prep
AS.051 Procedure Sequence and Reproducibility
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Research Summary: A reaction-rate study measured how iodide concentration affects the time for a solution to turn blue. Which sequence is best?
A
Record the blue time, then decide which concentration was used in each flask, under the conditions and evidence described in the passage, and for the specific setup, variables, and limits stated in the item.
B
Use warmer solutions for lower iodide concentrations so all times are similar, for the specific setup, variables, and limits stated in the item, and when the displayed data and experimental conditions are considered.
C
Start the timer before measuring the solutions, mix unequal volumes, and stop when the color seems dark enough, when the displayed data and experimental conditions are considered, and within the range and context provided by the passage.
D
Prepare labeled solutions with assigned iodide concentrations, bring all solutions to the same temperature, mix equal volumes in a flask, start the timer at mixing, and stop timing at the first permanent blue color.
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