State any 2 observations in an activity which may suggest that a chemical reaction has taken place .give examples to support the answer
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When iron nails are putted in water they get rust hence we can determine that chemical reactions had taken place.
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colour change, appearance of bubbles.
example-during the process of electrolysis bubbles appear, carbon dioxide oxide mixed with MILk of magnesia changes colour
sahasraramadugu2005:
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