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प्रश्न
Fill in the blank
Heat is ________ by a gas during the process of condensation.
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उत्तर
Heat is released by a gas during the process of condensation.
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संबंधित प्रश्न
Chemical changes are accompanied by changes in energy.
Classify the following changes as physical or chemical:-boiling
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Water is known as a universal solvent. Why?
Water is the universal solvent. Why?
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
