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प्रश्न
Fill in the blank.
The reaction in which energy is evolved is called
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उत्तर
The reaction in which energy is evolved is called exothermic reaction.
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संबंधित प्रश्न
A physical change is temporary. Explain.
Write true or false
Decomposition of leaves is a fast 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.
Classify the following as a physical or a chemical change.
Boiling of water
Give four difference between physical and chemical changes.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Select the chemical changes from the following list of changes
The carbon cycle.
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
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.
Sublimation of Iodine is a ______.
