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प्रश्न
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
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उत्तर
Glowing of an electric bulb is a PHYSICAL change as no change in the composition of filament takes place is reversible, the only filament glows when electricity is passed and returns to its original form on switching off the electric current.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
Classify the following changes as physical or chemical:- melting of a solid (wax)
State whether the following is physical or chemical change.
Digestion of food —
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Classify the following as a physical or a chemical change.
Burning of coal
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
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 |
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
