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प्रश्न
What role does energy play in initiating a chemical change ?
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उत्तर
In a chemical change molecules and atoms rearrange themselves to form new substances. This process involves some energy changes. In some changes energy is absorbed
e. g. burning of a substance and in some cases energy is evolved e.g. photosynthesis
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संबंधित प्रश्न
Fill in the blank
Burning of fuel is a _______ change.
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
State whether the following is physical or chemical changes.
Boiling of an egg —
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
True or false?
During a physical change energy is either given out or absorbed by the system.
Melting of solid (wax) is a physical change.
Under which different types can the following changes be classified?
Conversion of milk into yoghurt.
Give reason.
While purchasing canned food, its expiry date should be checked.
______ is the process in which something becomes different from what it was earlier.
Cut vegetables turn brown when exposed to air, this is due to ______.
