Chromatography is the separation of liquids based on particle or molecule size. Chromatography is used to separate inks into the colors that make them up.
Most inks are mixtures of colors and the ink will separate into bands of colors based on the size of the differnt ink molecules.The small particles move faster and will move further up the paper strip. Some black inks are actually made up of blue red, pink, and yellow.
Pairs or groups of students received a strip of filter paper and made a pencil line about 3 cm from the end. They then traced over the pencil line with a marker, dipped the paper into water and waited.
Chromatography can be used to separate any mixtures with different size particles and actually gel electrophoresis used for DNA analysis works on a similar principle.
If you were absent for the Physical versus Chemical lab, you can make up the majority of it by following the link below and watching YouTube videos of the experiments. You can also just check them out because they are cool.
Open a link in a new tab. In the blue box, look for "Play Games" and "Scatter." You will then need to drag the names to the correct formula. If it disappears, you matched it correctly. Play each set a couple of times until you get really good. You can also use these as flashcards and make up and take tests.
Click on the rice above to test your knowledge of the Periodic Table while earning rice for the United Nations World Food Program. You can also test your knowledge of vocabulary as an excellent SAT prep.