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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
State whether the following is physical or chemical changes.
burning of wood -
Tick (√) the correct alternative from the choice given for the following statement
When sugar is heated, its colour changes into
Distinguish between the following.
Periodic change and non-periodic change
Give reason.
A dry handkerchief gets wet at once on dipping in water, but it takes longer for a wet handkerchief to dry.
Fill in the blanks with the appropriate words of the statement given below:
Chemical changes may involve exchange of energy in the form of __________ and _________.
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.
- ______.
- ______.
- ______.
Paper, LPG, CNG petrol, etc, are ______ substances.
What is the change?
Cut vegetables turn brown when exposed to air, this is due to ______.
