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This test is run by .
Note that your final mark will not be saved in the system.

Purity, formulations, chromatography and identification of gases Reorder

Running Total

Attempt

1 of 3

Drag and drop the boxes into the correct order.

Place these steps in the order they take place during chromatography.

Remove the paper from the solvent and mark the point it reached on the paper
Calculate R_f values for each substance
Add a small spot of each substance to the pencil line
Allow the paper to dry
Place the chromatography paper in a beaker of solvent with the pencil line above the solvent
Draw a pencil line near the bottom of the chromatography paper
Wait until the solvent has soaked upwards through most of the paper
Measure the distance travelled by the solvent and each substance

This is your 1^st attempt! The marking algorithm gives more marks for getting the right order first time.

Pass Mark

70%