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प्रश्न
Select the chemical changes from the following list of changes
The occurrence of lightning.
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उत्तर
Occurance of lightening is a CHEMICAL change, energy is produced, a new substance with new properties is produced.
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
State whether the following is physical or chemical changes.
burning of sugar —
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Classify the following as physical or chemical change :
Growth of a plant
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
- Making sugar solution is a ______ change.
- A physical change is generally ______.
- Grinding of wheat grain changes its size. It is a ______ change.
- Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.
Give two examples for the following case:
Physical changes which are not reversible
