list 4 observation to check weather the reaction take place or not
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1. If something is reacting may some bubbles occures.
2. when two metals react ammonia gas is released then red litmus paper changes to blue.
3. when HCl is reacted with lime water carbon dioxide is released and when carbon dioxide is reacts with H2O it changes blue litmus paper to red.
4.when a peice of sodium dropped into H2O and reacts due to intense heat it causes fire.
2. when two metals react ammonia gas is released then red litmus paper changes to blue.
3. when HCl is reacted with lime water carbon dioxide is released and when carbon dioxide is reacts with H2O it changes blue litmus paper to red.
4.when a peice of sodium dropped into H2O and reacts due to intense heat it causes fire.
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