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प्रश्न
Chemical changes are accompanied by changes in energy.
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उत्तर
In a chemical change, molecules and atoms rearrange themselves to form new substances. This rearrangement involves some energy changes. It can either be absorption or evolution of energy.
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संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
What do you observe when :
a spoon of sugar is heated in a pan
State whether the following is physical or chemical changes.
burning of wood -
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
Tick (√) the correct alternative from the choice given for the following statement
When sugar is heated, its colour changes into
Under which different types can the following changes be classified?
Revolution of the earth around the sun.
Under which different types can the following changes be classified?
Stretching of a spring.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
Picture based question
Observe the picture and list down the changes that are accompanied in the picture.
- ______.
- ______.
- ______.
Observe the picture containing a kettle and note that it has salt water in it and answer the following questions:
- What is name of the process that is done to the kettle?
- What will happen to the content of the kettle?
- What kind of change is occurring on the cold surface of the metal plate?
- What can you say about the quality of water that is obtained in the beaker?
