Chemical reactions affect you every second of every day. For example, did you know your body is firing chemical reactions in your body 24/7 to help keep you alive? Other chemical reactions take place to make our cars move or in the thunderstorms you see outside. They are all around us. When atoms in substances are jumbled and rearranged to form new, different substances they undergo a chemical change. We call these changes reactions. That is the focus of our fourth unit of study in Chemistry.
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