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प्रश्न
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
उत्तर
If a change is permanent and irreversible it is considered a chemical change.
APPEARS IN
संबंधित प्रश्न
Melting of solid (wax) is a physical change.
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
State four differences between physical and chemical changes.
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Filling up a balloon with hot air is a _______ change.
Gas exists in three states as solid, liquid, and gas.
Which of the following is not a physical change?
