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Introduction to Physical and Chemical Changes Video Lecture | Science Class 7

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FAQs on Introduction to Physical and Chemical Changes Video Lecture - Science Class 7

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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