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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
What role does energy play in initiating a chemical change ?
State whether the following is physical or chemical changes.
shaping a piece of glass —
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
What will you take into account while identifying the following?
A physical change in a substance.
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Select the chemical changes from the following list of changes
Drying of a fruit
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
