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Question
Which observation does not indicate that a chemical reaction has occurred?
Which observation does not indicate that a chemical reaction has occurred?
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Solution
The correct option is D Change in total mass of substance
Chemical reactions are characterised by changes that are quite easily observed. Some of these changes are :
(1) Evolution of gas
(2) Change of colour
(3) Formation of precipitate
(4) Change of state
(5) Change in energy
During a chemical reaction, there is no change in the total mass of the substance as the mass or energy cannot be created nor destroyed it can only be transferred within the closed system.
Change in total mass of substance
Chemical reactions are characterised by changes that are quite easily observed. Some of these changes are :
(1) Evolution of gas
(2) Change of colour
(3) Formation of precipitate
(4) Change of state
(5) Change in energy
During a chemical reaction, there is no change in the total mass of the substance as the mass or energy cannot be created nor destroyed it can only be transferred within the closed system.
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