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प्रश्न
State the Differences Between a Physical Change and a Chemical Change.
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उत्तर
State the differences between a physical change and a chemical change.
| Property | Physical change | Chemical Change |
| Formation of new | There are no new substan | New substances with different |
| substance | ces formed in a physical change. | properties are formed in a chemical changes. |
| Nature of change. | It is usually easy to reverse the process, thereby regain -ing the original substance. | It is usually irreversible. |
| Energy | Generally energy is neither absorbed nor evolved. | Considerable heat energy is either absorbed or evolved when a chemical change takes place. |
| Mass | There is no change in the mass of the substance after a physical change. | Mass of a substance changes after a chemical change. |
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
Write true or false
Melting of ice is a physical change.
Write true or false
A natural change can also be a desirable change.
What is a physical change ? Give two examples of physical changes.
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Grinding of wheat grain changes its size. It is a ____________ change.
