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16 March, 17:13

S8P1e. Which set of procedures and observations indicates a chemical change?

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  1. 16 March, 19:43
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    The answer is (4), (3) is merely a change in composition, thus not chemical but physical.

    Answer: (4). Option 4 seems to be the one undergoing a chemical change because there is a formation gas from the bubbling that occurs. Chemical change is the change that results to the formation of a new substance. The other options given are examples of physical change.
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