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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
Classify the following as chemical or physical change:
Melting of butter in a pan
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Classify the following changes as physical or chemical: curdling of milk
How do you say that the process of digestion is a chemical change ?
State whether the following is physical or chemical changes.
Slaking of lime —
True or false
Is the process of digestion a physical change?
Write true or false
Deforestation is a man-made change.
Give four difference between physical and chemical changes.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Digestion of food is a physical change.
In a solution of salt in water, water is the solute
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Natural changes which take place in nature on their own, are beyond the control of human being.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
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.
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?
Adding sugar to milk is a physical change.
