Advertisements
Advertisements
प्रश्न
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
उत्तर
Iron III oxide [Fe2O3x H20]
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Classify the following as physical or chemical change :
Condensation of steam
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
What type of energy changes is associated when ice melts?
