2. Distillation • process used to separate a mixture (a liquid) composed by two ore more substances which are not chemically joint together • involves a change of state, e.g. liquid to gas

3. Basic distillation process • the mixture of substances is placed in a flask and heated • the substance with the lowest boiling point vaporizes first. The temperature remains constant until that substance has been completely distilled 3. the vapor is led into the condenser 4. it condenses and runs off into a receiving vessel • the product obtained is the distillate. Those substances having a higher boiling point remain in the flask and constitute the residue

4. The fractional distillation process When the substance with the lowest boiling point has been removed, the temperature can be raised and the distillation process repeats with the substance having the next lowest boiling point. The process of obtaining fractions in this way is one type of fractional distillation.

5. The destructive distillation process The destructive distillation process Involves heating out of free contact with air such as substances like wood and coal and collecting separately the portions driven off.

6. A diagram showing the process of distillation.

7. Sources http://www.factmonster.com/ http://en.wikipedia.org/wiki/Main_Page Group Members 3A Charis Kwok (16) Grace Kwok (17) Cassandra Kwok (18) Charmaine Kwong (19) Vivian Lai (20)