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प्रश्न
Classify the following changes as physical or chemical.
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उत्तर
- boiling — Physical
- curdling of milk — Chemical
- photosynthesis in plants — Chemical
- melting of a solid (wax) — Physical
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संबंधित प्रश्न
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Tick the most appropriate answer.
Photosynthesis requires
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Stretching gold coin into a ring is a ______ change.
Sublimation of Iodine is a ______.
Water is known as a universal solvent. Why?
______ is the Universal Solvent.
