If you were to perform your experiment on a chromatography strip that was twice the length of the one you used, would your rf values still be the same?

Yes, Rf will be the same

Explanation:

RF is the retention factor, a ratio calculated to know the distance a liquid travels up a chromatography plate. Since it is a ratio that goes between 0 and 1, the change in the length of the strip won't affect its value because the proportionality will be kept.

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