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प्रश्न
What is a chemical change ? Give two examples of chemical changes.
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उत्तर
Chemical change: These changes occur when a substance combines with another to form a new substance. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
Examples:
- Rusting of iron
- Burning of paper
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Classify the following changes as physical or chemical:- photosynthesis in plants
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Write true or false
Earthquake is a desirable change.
Name two reversible changes.
Classify the following as a physical or a chemical change.
Burning of coal
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.
Periodic and non-periodic change
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Mention a few physical properties of a substance.
