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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
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Write true or false
Cutting of paper into pieces is a chemical change.
Classify the following as physical or chemical change :
Condensation of steam
The rusting of an iron object is called :
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Compare the energy changes involved during a physical and a chemical change.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
