Question

SOMS P
Date
23) write any two observations in an activity which
may suggest that a chemical reaction has
taken place. Give an example in support of
your answer .​

Answer 1

Answer:

) change in temperature. eg; calcium oxide reacts vigorously with water to produce calcium hydroxide along with evolution of large amount of heat. 2) evolution of gas. eg; Zn reacts with H2so4 to form ZnSO4 and H2