Write two observation in an activity which mays suggest that a chemical reaction taken places given an example
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The formation of ppt
change in colour
evolution of gas
change in state
example
Take Na2CO3 is a test tube and add a few drops of dil HCI to the test tube. A colourless and odourless gas is evolved which shows that chemical reactions has takes place. Pass the gas through lime water it turns lime water milky.
change in colour
evolution of gas
change in state
example
Take Na2CO3 is a test tube and add a few drops of dil HCI to the test tube. A colourless and odourless gas is evolved which shows that chemical reactions has takes place. Pass the gas through lime water it turns lime water milky.
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