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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
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Write true or false for the statement
A natural change can also be a desirable change
A physical change is temporary. Explain.
State the differences between a physical change and a chemical change.
Write true or false
Decomposition of leaves is a fast change.
What are man-made changes ?
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Fill in the blank.
The process of a liquid changing into a solid is called ________
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Give four difference between physical and chemical changes.
What will you take into account while identifying the following?
A chemical change in a substance.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Select the chemical changes from the following list of changes
Drying of a fruit
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
Cutting a log of wood into pieces is a chemical change.
Explain the characteristics of physical change with examples.
