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Mindmap: Physical and Chemical Change | Science Class 7

The document Mindmap: Physical and Chemical Change | Science Class 7 is a part of the Class 7 Course Science Class 7.
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FAQs on Mindmap: Physical and Chemical Change - Science Class 7

1. What is the difference between a physical and chemical change?
Ans. In a physical change, the substance's chemical composition remains the same, but its physical properties may change. In a chemical change, the substance undergoes a chemical reaction, resulting in a new substance with different chemical properties.
2. Can you provide examples of physical changes?
Ans. Examples of physical changes include melting ice, boiling water, crushing a can, and cutting paper. In all these examples, the chemical composition of the substances remains the same even though their physical appearance changes.
3. How can you differentiate between a physical and chemical change?
Ans. One way to differentiate between a physical and chemical change is to observe if a new substance is formed. If a new substance with different chemical properties is formed, it is a chemical change. If the substance retains its chemical composition, it is a physical change.
4. What are some indicators of a chemical change taking place?
Ans. Some indicators of a chemical change include the production of gas, formation of a precipitate, change in color, release of heat or light, and changes in odor. These changes indicate that a chemical reaction is occurring.
5. Is cooking an egg an example of a physical or chemical change?
Ans. Cooking an egg is an example of a chemical change. When an egg is cooked, the proteins in the egg denature and coagulate, resulting in a new substance with different chemical properties than a raw egg.
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