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| Fizz, Bubble, POP! Chemical Reactions! A chemical reaction is when two substances are combined and a new substance is formed. We spent many days in the classroom discovering the formation of new substances through chemical reaction. This is a great unit to introduce Physical Science to 6th graders. It is hands-on and engaging with lots of partner and group work. Students were able to differentiate the differences of a physical change (substance does not change) vs. a chemical change (a new substance is formed). How do scientists analyze and interpret data on the properties of substances before and after substances interact?  Focus Question: What is the evidence that a chemical reaction has occurred? Standard:
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