Tuesday, April 21, 2009

seperating mixtures

how to seperature sand from a mixture?
-> actually it depends on what the mixture is. if it were sand and water, we could just use a filration paper or just boil the water till the water evaporated, leaving only the sand behind.
or another example is separating sand from a mixture dirt.Take 100 ml beaker, pour the mixture, and stir with a stirring rod 10- 15 minutes. Once done, let the beaker to stand for 20-30 minutes. as time goes you will see the different layer in the beaker with sand at the bottom of beaker as it is heavier than dirt and then a layer of dirt on it.

iron + mixture?
-> you can use a strong magnet to attract the iron as the iron is magnetic.

solid + mixture?
-> 4 methods are commonly used for seperating mixtures from solids.
1.filtering
2.evaporating
3.crystallizing
4.Centrifuging
This is evaporation .

for the rest so sorry, can't find pictures.
air + mixture
->lets say that the mixture is water. in this case, we are able to use a separating funnel as petrol which acts like oil, floats on water.
sorry for the drip drop information. can't find anything about it. o-O