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L2 : Physical Change - Physical & Chemical Changes, Science, Class 7 Video Lecture

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FAQs on L2 : Physical Change - Physical & Chemical Changes, Science, Class 7 Video Lecture

1. What is a physical change?
Ans. A physical change refers to a change in the physical properties of a substance without altering its chemical composition. It can be easily reversed and does not result in the formation of a new substance.
2. Give examples of physical changes.
Ans. Some examples of physical changes include melting of ice, boiling of water, tearing a piece of paper, dissolving salt in water, and crushing a can.
3. How is a physical change different from a chemical change?
Ans. A physical change only affects the physical properties of a substance, such as its shape, size, or state, without changing its chemical composition. On the other hand, a chemical change results in the formation of new substances with different chemical properties.
4. Can physical changes be reversed?
Ans. Yes, physical changes can be easily reversed. Since they do not involve any chemical reactions, the original substance can be recovered by reversing the process that caused the change.
5. Are changes in state of matter considered physical changes?
Ans. Yes, changes in the state of matter, such as melting, freezing, evaporation, and condensation, are considered physical changes. These changes involve a transformation from one state to another without any alteration in the chemical composition of the substance.
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