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Question
Give two examples for the following case:
Physical changes which are not reversible
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Solution
- Cutting of paper
- Breaking of glass
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RELATED QUESTIONS
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Write true or false for the statement
A natural change can also be a desirable change
Write short answer.
Name two reversible changes.
How do you say that the process of digestion is a chemical change ?
Write true or false
Melting of ice is a physical change.
Write true or false
Decomposition of leaves is a fast 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.
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. |
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Gas exists in three states as solid, liquid, and gas.
