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प्रश्न
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.
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उत्तर
The following points pertain to chemical changes:
b. The change is permanent.
e. Produces one or more new substances by change in its composition.
The remaining points pertain to physical changes.
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संबंधित प्रश्न
What are reversible and irreversible changes ? Give one example for each.
Fill in the blank.
Growing of a seedling into a plant is _______ change.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Which of the following are physical changes and which are chemical changes ?
Fill in the blank.
The process of a liquid changing into a solid is called ________
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.
Name the following.
A form of energy required for a chemical change.
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. |
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
