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प्रश्न
State whether the following is physical or chemical changes.
lightning —
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उत्तर
chemical change,
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संबंधित प्रश्न
Write short answer.
Give an example of desirable change which can also be undesirable
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Tick the most appropriate answer.
Photosynthesis requires
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Give the main differences between physical changes and chemical changes.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Water is the universal solvent. Why?
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
- Making sugar solution is a ______ change.
- A physical change is generally ______.
- Grinding of wheat grain changes its size. It is a ______ change.
- Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
