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प्रश्न
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
उत्तर
Change of water into water vapours is a PHYSICAL change as no change in composition, only state changes, is reversible change on cooling vapour water is formed.
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संबंधित प्रश्न
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
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 |
Name a chemical change which takes place in presence of:
True or false
Is melting of ice a reversible change?
Classify the following as a physical or a chemical change.
Burning of coal
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a 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:
Keeping a stone in sunlight for few hours is ______.
