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प्रश्न
Write true or false
Cutting of paper into pieces is a chemical change.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Chemical changes are accompanied by changes in energy.
Name a chemical change which takes place in presence of:
State whether the following is physical or chemical changes.
shaping a piece of glass —
What are man-made changes ?
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Grinding of wheat grain changes its size. It is a ____________ change.
