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Introduction to Physical and Chemical Changes Video Lecture | Science Class 7 (Old NCERT)
FAQs on Introduction to Physical and Chemical Changes Video Lecture - Science Class 7 (Old NCERT)
| 1. What is a physical change? |  |
Ans. A physical change refers to a change in a substance's appearance, shape, or state without altering its chemical composition. For example, melting ice, tearing paper, or boiling water are all examples of physical changes.
| 2. What is a chemical change? | |
Ans. A chemical change, also known as a chemical reaction, occurs when substances combine or break apart to form new substances with different properties. Examples of chemical changes include burning wood, rusting of iron, or digesting food.
| 3. What are some examples of physical changes? | |
Ans. Examples of physical changes include melting of ice, freezing of water, cutting paper into smaller pieces, dissolving sugar in water, or bending a metal wire. In each of these examples, the substances involved undergo a change in their appearance or state, but their chemical composition remains unchanged.
| 4. What are some examples of chemical changes? | |
Ans. Examples of chemical changes include burning of a candle, digestion of food, fermentation of fruits to produce alcohol, or the formation of rust on iron. In each of these examples, new substances with different properties are formed, indicating a chemical change has occurred.
| 5. How can we distinguish between physical and chemical changes? | |
Ans. One way to distinguish between physical and chemical changes is by observing if new substances are formed. If new substances are produced with different properties, it indicates a chemical change. On the other hand, if the appearance or state of a substance changes without the formation of new substances, it is a physical change. However, it is important to note that some changes can be both physical and chemical, depending on the circumstances.
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