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प्रश्न
What is a chemical change ? Give two examples of chemical changes.
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
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Classify the following as chemical or physical change:
Burning of paper and wood
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Photosynthesis cannot take place at night.
Tick the most appropriate answer.
Photosynthesis requires
Given reason:
Burning of paper is a chemical change.
Is a change of state of matter – a physical or a chemical change. Give reasons.
What type of change is colouring of a paper?
______ is the substance that is dissolved in a solvent.
When solute is dissolved in a solvent it forms a solution.
