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प्रश्न
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
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उत्तर
Magnesium is heated producing a bright light to form MgO in the air is a chemical change as the composition changes (MgO white powder) is formed, is irreversible. We cannot get magnesium back from MgO.
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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
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State the differences between a physical change and a chemical change.
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Desirable and undesirable change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
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State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Wood to sawdust:______:: Wood to Ash: Chemical change
______ is the substance that is dissolved in a solvent.
Which of the following is a physical change?
