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What is the difference between a suspension and a colloid In a suspension the solids settles out of the mixture over time, in a colloid the solid pieces are smaller so they don’t settle out
Using salt water as an example, name the solvent, solute and solution. Solvent = water, Solute = Salt, Solution = Salt Water
Describe the nature of a saturated solution. Use the keywords solvent and solute in your answer A solution that contains so much dissolved solute that no more solute can dissolve in it
Describe how to separate the solute from a solution e.g salt from salt water The salt water is heated to evaporate the water and it escapes into the air. This leaves behind the salt that was dissolved in it
Describe how you would separate the different colours in a black pen, by chromatography 1) Draw a pencil line on the chromatography paper 2) Put a dot of the black ink on the pencil line 3) Place the paper in the solvent making sure the solvent is touching the paper but below the pencil line. 4) Let the solvent rise up the paper
Describe how you would distinguish between a pure substance and a mixture from their chromatograms A pure substance will produce a chromatogram with one spot, A mixture will produce a chromatogram with a number of spots
Explain the process used to separate a mixture of liquids with different boiling points A solution is heated, the lower boiling point liquid in the mixture will evaporate. The vapour of the lower boiling point liquid in the mixture is passed through a condensor where it cools, and is condensed
The boiling of ethanol is 78oC The boiling point of water is 100oC. Explain which liquid will be collected from a mixure of them using distillation Ethanol because it has the lower boiling point
State the two steps required to separare sand from a mixture of sand and salt? 1) Add water to the mixture 2) Filter off the sand
List the three stages required to produce dry salt crystals from salt water. 1) Heat the salt water 2) Leave the rest of the water to evaporate 3) Pat dry the crysals
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