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प्रश्न
Select the chemical changes from the following list of changes
Rotting of eggs.
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उत्तर
Rotting of eggs is CHEMICAL change, change in composition takes place, is an irreversible process.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Explain the following giving an example.
Pure substance
Fill in the blank.
A new substance is formed in a ............... change.
How do you say that the process of digestion is a chemical change ?
A burning candle shows both physical and chemical changes. Explain ?
Name a chemical change which takes place in presence of:
Photosynthesis cannot take place at night.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Give two examples for the following case:
Physical changes which are not reversible
