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प्रश्न
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
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उत्तर
Iron III oxide [Fe2O3x H20]
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Photosynthesis cannot take place at night.
Name a chemical change which takes place in presence of:
Photosynthesis cannot take place at night.
Which of the following are physical changes and which are chemical changes ?
Classify the following as a physical or a chemical change.
Melting of wax
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
