C8 Gas Tests and Separating Mixtures FT (05/02/2026) - Katie Cheung | Library

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A pure substance has to be an element

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Lay the paper flat and leave it to dry
Draw a line with a pencil and ruler to one end of the strip of filter paper
When the solvent has almost reached the top of the filter paper, remove it from the beaker
Use a ruler to measure the distance the ink spot has travelled (Rf values)
Place a spot of ink on the pencil line
Carefully add the solvent to a level just below the ink spot, taking care not to splash the paper
Cover the beaker and wait a few minutes
Suspend the filter paper in a beaker so it isn't touching the sides or the bottom

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Draggable item		Corresponding Item
Shakes or bubble the gas through limewater		Limewater turns milky (cloudy)
Put Damp litmus paper into the gas		Litmus paper is bleached and turns white
Hold a burning splint at the open end of a test tube of the gas		A squeaky pop sound is produced
Place a glowing splint in a test tube of the gas		The splint relights.

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