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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
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
State the differences between a physical change and a chemical change.
Classify the following changes as physical or chemical:- photosynthesis in plants
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Make a list of different types of changes with example.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Which of the following are physical changes and which are chemical changes ?
Freezing of water
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
