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प्रश्न
Define physical change. Give two examples for the above changes.
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उत्तर
Physical change: A temporary change in which no new substance is formed, the composition of substance remains the same, though its state, shape and size may change.
Example of physical change:
- Change of water into its vapours.
- Heating of iron rod.
संबंधित प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Write true or false
Earthquake is a desirable change.
Fill in the blank
Heat is ________ by a gas during the process of condensation.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as physical or chemical change :
Formation of curd from milk
Classify the following as physical or chemical change :
Growth of a plant
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Classify the following as a physical or a chemical change.
Drying of wet clothes
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Classify the following as a physical or a chemical change.
Melting of wax
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.
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
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. |
What type of change is colouring of a paper?
Cutting a log of wood into pieces is a chemical change.
Give an example of a physical change in which the color of the substance changes.
