Friday, April 5, 2013

Our Sweet Lab

When we studied chemical and physical changes, our class did a awesome lab. A physical change is when something changes in size, shape, or state of matter. Chemical changes are change in temperature, color, a release of gas, or solid is formed. We went outside and we partnered up with someone of our choice. Before we went outside, we got all of the supplies/ingredients. We got a small, zip lock bag, a larger one, salt, vanilla extract, sugar, ice, milk, and our brains. After that we tried to guess what we were going to do. Mrs. Ramsay had been giving us hints all week.  We poured a half cup of milk into our bags. After that, we poured some sugar into the same bag. Everyone agreed it was a physical change. No one saw a change in in color or temperature. We also didn't see a release of gas or a solid being formed. After that, we put 1/4 teaspoon of vanilla extract, zipped the bag, and put it into the bigger bag. The class still thought it was a physical change because the color or temperature did not change. Next, we put the sandwich sized bag in a gallon sized bag. After that, we put in ice and salt. When we added the salt it was a chemical change because the ingredients were colder than before, much colder. Then we shook and shook until a huge chemical change! It went from a liqud to a solid. After that we talked about the changes that happened while we ate our sweet lab! This was such a great way to really learn and experince the differences between chemical and physical changes.

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