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प्रश्न
Fill in the blank.
The reaction in which energy is evolved is called
उत्तर
The reaction in which energy is evolved is called exothermic reaction.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
True or false
Dissolving of a solid in liquid is a physical change.
Classify the following as physical or chemical change :
Growth of a plant
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
When ice melts to form water, change occurs in its
Wood to sawdust:______:: Wood to Ash: Chemical change
