At the beginning are pictures from our first mixtures and solutions experiment in which we tested how mixtures and solutions could be separated. First, the students observed the three materials, (gravel, diatomacheous earth, and salt) using their five senses. We then mixed 5g of each solid materials with 50 mL of water using syringes. Each group then mixed the materials together and poured them over a cup with a metal screen sitting on top, they had record either yes or no, the material was separated by the screen. Then the materials we combined with the water again, and poured into an empty cup through a funnel and coffee filter, and then recorded either yes or no again. The results showed that The screen separated the gravel but not the diatomacheous earth and salt. The filter paper separated the gravel and the diatomacheous earth, but not the salt. We conclude from this that the first two combinations are called MIXTURES, and the salt and water combination is a SOLUTION. Solutions are different from mixtures, because one materials dissolves, or spreads evenly into the second materials. Mixtures can be easily separated. Solutions are explored further in another experiment.
The second experiment included in the slideshow, used the same materials; however each group was given the same bucket of materials, that also now included a magnet, and a cup that contained, salt, gravel, and a mysterious black substance (iron filings) and were told to separate all three from each other into three separate cups. The groups should have figured out that they could pour the mixture over a screen and the gravel would stay on top and the salt and iron filings would fall through. They would then run the magnet over what remained and the iron filings would be attracted to the magnet. Most groups did an excellent job of this.
For future reference, any blue linked words can be clicked on to see further information about that word.
i learned that a circit is cool to play in the electricty
ReplyDeleteI learned that an erosion happens when water, wind, ice, and gravity passes by and picks up sediments and drops them off in different places. #19
ReplyDelete