In the Mixture and Separation Lab Kari and separated three substances from another groups random mixture which at first we didn't know what was in it. But then discovered that it was Copper, Black Sand and Salt. We first minimized the possibilities. Since I knew what copper looked like I suspected that's what the small chunks of metal were, so I was able to sift that out with a filter. Then what was left was the two grainy mixtures that were black and white. The black grainy mixture at first made me think it was iron. But when we got the magnet to test it, it wasn't magnetic, so iron was out. Then we figured out for sure that it was the black sand. The last mixture to figure out was a white grainy substance. So it was either white sugar, white sand, or salt. The only way we figured out how to test it was by taste. When I tasted it I ruled out sand, and sugar because it wasn't sweet, it was salty, therefore it was salt. Now how were we going to separate the salt and black sand? We decided to pour it in a beaker of water because I knew the salt would dissolve but then we lost our weight in salt at the end of the experiment. The black sand all floated to the top and the salt sunk to the bottom and dissolved. Then we filtered out all the water. Then I took the remaining mixture of the salt and sand and subtracted the new weight of the sand and got the weight of the salt. Then I separatly weighed the copper that I had separated and filtered out in the start.
Start: Salt 5.50 Grams Copper 8.99 Grams Black Sand 5.06 Grams Finish: Salt 4.60 Grams Copper 8.94 Grams Black Sand 6.15 Grams The before and after effect of the correct weight of the copper was really close, but that wasn't the case with the salt and black sand. I think it was because the salt didn't dissolve in the beaker with the black sand but it settled with the sand when we seperated it out. That is why the end result of the sand was heavier and the remaining mixture of the salt was considerably lighter. 90% error
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The link below is a link to my Prezi on the Properties of Matter and Basic Chemistry.
http://prezi.com/yq3-krgvxs2s/properties-of-matter/ |