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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:
Boiling of water to form steam.
Write short answer.
Give an example of desirable change which can also be undesirable
State three differences between evaporation and boiling
State four differences between physical and chemical changes.
Classify the following as physical or chemical change :
Formation of curd from milk
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Keeping a stone in sunlight for few hours is ______.
