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प्रश्न
What is the difference between dissolution of sugar and burning of sugar ?
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उत्तर
1. Dissolution of sugar:
- When sugar is dissolved in water it disappears. It we taste the solution, the sugar is still present in dissolved form.
- If water is evaporated we get back the sugar.
- So it is a physical and reversible change.
2. Burning of sugar:
- Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar as the chemical bonds broke.
- Energy is released in the form of smoke.
- So, burning a sugar is a chemical change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
Classify the following as chemical or physical change:
Burning of paper and wood
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Fill in the blank.
An earthquake is a .................. change.
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
State whether the following is physical or chemical changes.
respiration in living beings —
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Sublimation is classified as a physical change. Why ?
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
