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प्रश्न
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
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उत्तर
physical change,
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संबंधित प्रश्न
Fill in the blank.
Changes that occur in nature are called ........................
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
Tick the most appropriate answer.
Photosynthesis requires
Write true or false
Burning of paper and formation of curd are reversible changes.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the following as physical or chemical change :
Condensation of steam
Select the chemical changes from the following list of changes
Drying of a fruit
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
Natural changes which take place in nature on their own, are beyond the control of human being.
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:
