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प्रश्न
What is a physical change ? Give two examples of physical changes.
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उत्तर
Physical change: These are changes in which no new substances are formed. These are temporary changes, which are easily reversible. The substance, which is involved in a physical change, does not lose its identity.
Examples:
- Water, if boiled, can be cooled and condensed.
- Mixing of iron fillings with sand is a physical change because they can be separated by a magnet.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
State whether the following is physical or chemical changes.
lightning —
Write true or false
A natural change can also be a desirable change.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Fill in the blank.
The reaction in which energy is evolved is called
Select the chemical changes from the following list of changes
The occurrence of lightning.
______ is the Universal Solvent.
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.
Which of the following is not a physical change?
