What are the changes taking place during chemical reaction?
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Change of odor.
Change of color (for example, silver to reddish-brown when iron rusts).
Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
Change of composition - paper turning to ash when burned.
Light and/or heat given off.
Formation of gases, often appearing as bubbles in liquids.
Formation of a precipitate (insoluble particles).
The decomposition of organic matter (for example, rotting food).
The change is difficult or impossible to reverse.
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Answer:
The changes that take place during a chemical reaction are :-
1. change in state
2. change in colour
3. evolution of gas
4. formation of precipitate
5. exchange of heat
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