GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is NOT an example of chemical change?
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sour milk
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burning wood
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sharpening a pencil
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rust
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Explanation:
Detailed explanation-1: -A physical change is cutting, bending, tearing and a Chemical change could involve fire, high temperatures, or color changes or a new smell.
Detailed explanation-2: -Melting of ice is not an example of chemical change as the chemical composition of water remains the same even after melting.
Detailed explanation-3: -Breaking of pencil is a physical change.
Detailed explanation-4: -Writing on a paper with pencil or pen is physical change because no products are formed. The pencil writting is reversible while writting with pen is reversible or irreversible.
There is 1 question to complete.