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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
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
What role does energy play in initiating a chemical change ?
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Sublimation is classified as a physical change. Why ?
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.
Butter getting rancid
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Physical Change: Boiling::Chemical Change: ______.
What is the difference between dissolution of sugar and burning of sugar ?
