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प्रश्न
State the Differences Between a Physical Change and a Chemical Change.
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 changes as physical or chemical:- photosynthesis in plants
Fill in the blank.
Growing of a seedling into a plant is _______ change.
Classify the following as physical or chemical change :
Growth of a plant
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Mention some of the different conditions needed for chemical changes to occur.
Explain the characteristics of physical change with examples.
