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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.
पर्याय
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
Fill in the blank.
Changes that occur in nature are called ........................
Tick the most appropriate answer.
Photosynthesis requires
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 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 formed | e. irreversible change |
| f . slow change |
Define a chemical change. Give two examples of the above changes.
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
What type of energy changes is associated when ice melts?
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:
The change of state of a substance from solid to liquid and liquid to gas is ______.
