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The physical changes Video Lecture | Science (Curiosity) Class 7 - New NCERT
FAQs on The physical changes Video Lecture - Science (Curiosity) Class 7 - New NCERT
| 1. What are physical changes in matter? |  |
Ans. Physical changes are alterations that affect one or more physical properties of a substance without changing its chemical composition. Examples include changes in shape, size, state (solid, liquid, gas), and appearance.
| 2. How can you identify a physical change? | |
Ans. You can identify a physical change by observing changes in physical properties such as color, texture, shape, or state. If the change can be reversed, such as melting ice back into water, it is likely a physical change.
| 3. What are some common examples of physical changes? | |
Ans. Common examples of physical changes include melting ice, boiling water, breaking a glass, dissolving sugar in water, and chopping vegetables. In all these cases, the original substance remains the same chemically.
| 4. Can physical changes be reversible? | |
Ans. Yes, many physical changes can be reversible. For instance, when water freezes into ice, it can melt back into water. However, some physical changes, like breaking a glass, are not easily reversible.
| 5. How do physical changes differ from chemical changes? | |
Ans. Physical changes involve changes in physical properties without altering the chemical composition of a substance, while chemical changes result in the formation of new substances with different chemical properties. For example, burning wood is a chemical change, while melting butter is a physical change.
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