classify_the following as physical and chemical
change
a)cooking
b)melting of ice cream
c)cutting wood
d)burning of a wick
Answers
a) Chemical change
b) Physical change
c) Physical change
d) Chemical change
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Answer:
First we need to know that physical changes can be undone but chemical changes cannot hence they are irreversible
So
a. Cooking is a chemical change as it cannot be undone with physical means
b. Melting of ice cream is a physical change as you can put the melted ice cream in a fridge and get it back to its original state
c. Cutting of wood is a chemical change as the chopped piece of wood cannot be joined together by physical means
d. Burning of a wick is both a chemical and physical change as the wick can be taken back to its original form by some chemical processes
but it cannot also be done by physical means
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