Chemistry

13 April, 03:33

1) In a chemical reaction, if a color change is detected, if an odor change is detected, or if a precipitate is formed, then: A. a chemical reaction has definitely occurred B. only physical reactions have occurred C. a chemical reaction may have occurred D. both physical and chemical reactions have definitely occurred 2) If different products are not created during a process, then a chemical reaction has not occurred. A. True B. False

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