Flashcards
Chem Revision
Flashcards do conjunto (7)
- 1Why is chromatography performed?So that coloured compounds of the mixture can be obtained.
- 2What is the formula for calculating the Retention Factor (Rf)?Distance moved by spot ÷ distance moved by solvent
- 3Natasha is performing chromatography. She measures how far the solvent moves up the paper (10cm) and how far the yellow dye moves up the paper (4cm). Calculate the Rf value for her experiment.4/10 = 0.4.
- 4What is the process of distillation? What is obtained at the end of the experiment?Separating a liquid from a mixture by evaporating a liquid and condensing.
The liquid is left behind after being cooled. - 5Label the following apparatus for distillation correctly, from 1-8.1. Anti-bumping granules.
2. Thermometer
3. Cooling water (going out)
4. Distillation flask
5. Solution.
6. The distillate
7. Cooling water (coming in)
8. Condenser. - 6Describe the apparatus.1. Anti-bumping granules can ensure that the liquid boiling process is smooth.
2. Keeps an eye on the temperature, to ensure the solution doesn't boil over before being condensed.
5. The solute and solvent together (e.g salty water)
6. The liquid that is left behind after it has been in the condenser (e.g pure water).
8. Cools the water and ensures that it doesn't boil over. - 7—
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- FlashCards sobre Chem Revision, criado por Harik 2014 em 23-04-2017.
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- Harik 2014
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