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Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions

do these grapes ferment? Is it a chemical or a physical change?

Science - Exemplar Problems

Chapter_Chemical Reactions And Equations


As the grapes are on the plant it continuously receive minerals and water from the plant but as the grapes are plucked the do not receive the water and minerals and then due to bacterial action it starts fermenting.
it is a chemical change since it can not be reversed .  
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