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प्रश्न
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
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उत्तर
| Physical change | Chemical change |
| Generally, energy is neither absorbed nor released during the change. | Generally, energy is either absorbed or evolved during change. |
| Example: Melting of ice, melting of the wax. | Example: Change of milk into curd and burning of a candle. |
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संबंधित प्रश्न
What role does energy play in initiating a chemical change ?
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as a physical or a chemical change.
Burning of coal
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Select the chemical changes from the following list of changes
The occurrence of lightning.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Mention a few physical properties of a substance.
