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प्रश्न
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
विकल्प
True
False
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उत्तर
False.
Correct Statement: Melting of ice is an endothermic, reversible physical change.
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संबंधित प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Photosynthesis cannot take place at night.
What role does energy play in initiating a chemical change ?
Define physical change. Give two examples for the above changes.
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Give four difference between physical and chemical changes.
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
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.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
