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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
State whether the following is physical or chemical changes.
Melting of wax —
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
What role does energy play in initiating a chemical change ?
Distinguish between the following.
Natural change and man-made change
Give reason.
A dry handkerchief gets wet at once on dipping in water, but it takes longer for a wet handkerchief to dry.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
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.
The difference between initial state and the final state is called change.
