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What are Physical Changes? Video Lecture | Science Olympiad Class 7

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FAQs on What are Physical Changes? Video Lecture - Science Olympiad Class 7

1. What are physical changes?
Ans. Physical changes refer to the alterations in the physical properties of a substance, such as shape, size, state, or appearance, without any change in its chemical composition or the formation of new substances.
2. Give some examples of physical changes.
Ans. Some examples of physical changes include melting of ice, boiling of water, tearing a piece of paper, breaking a glass, and cutting fruits.
3. How can physical changes be reversed?
Ans. Physical changes can often be reversed by applying appropriate conditions. For example, melting of ice can be reversed by cooling it down, and boiling of water can be reversed by condensing the vapor back into liquid form.
4. What is the difference between physical changes and chemical changes?
Ans. Physical changes only involve a change in the physical properties of a substance, such as its state or appearance, without any alteration in its chemical composition. On the other hand, chemical changes result in the formation of new substances with different chemical properties.
5. Can physical changes be detected by our senses?
Ans. Yes, physical changes can usually be detected by our senses. For example, we can observe the change in state when ice melts into water or the change in appearance when a paper is torn apart. Our senses can help us perceive these alterations in the physical properties of substances.
34 videos|88 docs|54 tests
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