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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
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
What role does energy play in initiating a chemical change ?
Classify the following as physical or chemical change :
Formation of curd from milk
Classify the following as a physical or a chemical change.
Boiling of water
Distinguish between the following.
Physical change and chemical change
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.
Desirable and undesirable change.
Select the chemical changes from the following list of changes
Drying of a fruit
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
