Today we continued our work with solutions and chemical changes. We conducted our experiments in ziploc style bags so that we could observe the amount of carbon dioxide gas created by the chemical change. Students found that citric acid and baking soda created far more gas than calcium chloride and baking soda because there was no precipitate at the bottom of the bag. We reiterated that "what you put in" a solution is the same as "what you get out" but that it just is in a different form. This idea goes towards our chemical change and conservation of matter targets. Tomorrow we will review evidence of chemical changes and begin preparing for our end of unit test on mixtures and solutions. The test will likely be Tuesday, 1/29.
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