Chemistry
Grade-10
Easy
Question
Which of the following is NOT an example of a physical change?
- Crumpled paper
- Pencil sharpening
- Shrunken clothing
- Sour milk
Hint:
A physical change is a type of temporary change where the physical properties of matter change. This physical change involves no new substance formation. While the chemical change involves a new product formation.
The correct answer is: Sour milk
Sour milk is not an example of physical change.
- The souring of milk is classified as a chemical change because it results in the production of a new substance i.e. sour-tasting lactic acid.
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