State any two observations in an activity which may suggest that a chemical reaction has taken place. give an example to support your answer
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(1) evolution of gases
(2) change in temperature
(1) example Zn + H2So4__ZnSo4+H2
(2) example C+ O2___CO2
hope this will help you dear
(2) change in temperature
(1) example Zn + H2So4__ZnSo4+H2
(2) example C+ O2___CO2
hope this will help you dear
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