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प्रश्न
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
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उत्तर
BURNING OF MAGNESIUM RIBBON is chemical change as It is
- Irreversible change
- New product with new properties is formed (MgO)
- It is a permanent change
- Composition is changed
- Energy is required to bring the change.
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संबंधित प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Classify the following changes as physical or chemical: curdling of milk
How do you say that the process of digestion is a chemical change ?
State whether the following is physical or chemical changes.
cutting wood into small pieces —
True or false
Change of seasons is a non-periodic change.
Tick the most appropriate answer.
Physical changes are
Photosynthesis cannot take place at night.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
What will you take into account while identifying the following?
A physical change in a substance.
