With the help of an activity; demonstrate how do we know that a chemical reaction has taken place?
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Answer:
1) Change in state
2) Evolution of gas
3) Change in color
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Answer:ca chemical change has taken place can be understood by the following :-
1. Change In Colour-
when iron nails are kept in the window for some days we find the grey nail has got some red deposits on it.the nail turns reddish brown.actually it forms a new compound which is Iron Oxide and the red deposit is the rust.
4Fe + 3O2= 2 FE2O3
2. Temperature Change-
fireworks is an example where it emits light and produce a temperature change.it is an oxidising agent.so when it bursts, it release energy in form of heat and light and sound is heard.
3. Formation Of Precipitate-
AgNO3(aqueous)+KCl(aqueous) = AgCl(precipitate)+KNO3(aqeous)
4. Evolution Of Gas-
reaction of dilute sulphuric acid with zinc granules
H2SO4+Zn = ZnSO4 +H2
Explanation:
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