Wednesday, September 28, 2011

chromatography*



I did a chromatography experiment. I used filtered paper and a petri dish. Then i filled the dish up with water. Then I drew a design on the filtration paper. After I made two wholes on each side of the paper.Next, I rolled up a piece of paper and put it in the whole. Then I watched the water travel into the paper. It caused the ink to separate. Some the inks separated more than others. The colors with smaller molecules separated more because the smaller molecules were lighter to travel through.

Friday, September 9, 2011

Separation of mixtures lab*


I thought this lab was cool, I never did anything like this before. I learned a lot of new things. One thing that i learned is how to separate the mixtures. The first thing we did was got a beaker and added sugar, dirt,and then boiling stones. Then we exchanges out ingredients with another group. We decided that there was: iron metels, boiling stones, and calcium chloride. However we didn't know how to figure out how much of the ingredient there was. We tried to separate the mixtures by a magnet and net. I learned that we used a type of filtration.

Kendra and I first did our own mixture we added:
sugar 23.40
dirt 12.98
boiling stones 2.76

The other group got:
sugar: 25.10
Dirt:18
boiling stones: 14



Filtration-sperates solids from liquids by using a parous barrier
Distillation-Separates substance on the basis of the boiling points of the substance
Chromatgraphy-separates substance based on their movements through a special paper
Centrifuation- separates the components of a mixture based on the tendency of each component to travel or be drawn across the surface of another material.


We exchanged with Logan's group. We used a net to try and separate the mixture. It worked pretty good but not good enough we still needed something to get all the iron metal. So Then we used a magnet to separate the iron metel




This is what we got for their mixture:

iron metals 27.26

boiling stones 22.57

calcium chloride 3.04

These were the real result:

iron metal: 23
boiling stones: 14
calcium chloride: 7