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प्रश्न
Select the chemical changes from the following list of changes
Respiration in mammals.
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उत्तर
Respiration in mammals is a CHEMICAL change, we breathe in oxygen and breathe out carbon dioxide. It is irreversible and composition changes.
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संबंधित प्रश्न
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Chemical changes are accompanied by changes in energy.
True or false
Dissolving of a solid in liquid is a physical change.
Give the main differences between physical changes and chemical changes.
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
In a solution of salt in water, water is the solute
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. |
