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प्रश्न
Write true or false
Burning of sugar is a temporary change.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Cutting of trees
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
Define a chemical change. Give two examples of the above changes.
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
Compare the energy changes involved during a physical and a chemical change.
Select the chemical changes from the following list of changes
Respiration in mammals.
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 |
______ is the substance that is dissolved in a solvent.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
