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प्रश्न
What do you observe when :
a spoon of sugar is heated in a pan
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उत्तर
When a spoon of sugar is heated in a pan, black (charred sugar) (carbon) is seen. Is a chemical change.
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संबंधित प्रश्न
What do you observe when :
a piece of paper is burnt
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
Chemical changes are accompanied by changes in energy.
Under which different types can the following changes be classified?
Conversion of milk into yoghurt.
Under which different types can the following changes be classified?
Stretching of a spring.
Explain in brief the involvement of energy in physical and chemical changes.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
Picture based question
Observe the picture and list down the changes that are accompanied in the picture.
- ______.
- ______.
- ______.
Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
| S. No. | Change | Can be reversed (Yes/No) |
| 1. | The sawing of a piece of wood | |
| 2. | The melting of ice candy | |
| 3. | Dissolving sugar in water | |
| 4. | The cooking of food | |
| 5. | The ripening of a mango | |
| 6. | Souring of milk |
Paper, LPG, CNG petrol, etc, are ______ substances.
