In a laboratory experiment, a fermenting aqueous solution of glucose and yeast p

Question

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. The solution was heated by burning natural gas in Bunsen burner to distill the ethanol that formed in the flask. During the distillation, the ethanol evaporated and then condensed in the receiving The flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the During this experiment the following changes occurred. Which of these changes involved a physical change and not a chemical change? formation of ethanol from glucose by yeast formation of carbon dioxide gas from glucose formation of a carbon deposit inside the flask burning of natural gas condensation of ethanol evaporation of ethanol

Explanation / Answer

Option 5 and 6 are the example of a physical changes.

Solution: Option 5: Condensation of ethanol vapour into liquid are phase transformation where gaseous ethanol form convert into to liquid ethanol, so its physical changes.

Option 6: and reverse of above process i.e., evaporation of enthal is also an examples of physical changes.

All otherabove option1 to 4 an example of chemical changes in which old bond are breaking and new breaking.

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