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प्रश्न
Which of the following are physical changes and which are chemical changes ?
विकल्प
Physical change
Chemical change
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उत्तर
Burning of magnesium wire – Chemical change
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Make a list of different types of changes with example.
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.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Select the chemical changes from the following list of changes
Breaking of glass
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
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 |
Mention a few physical properties of a substance.
