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प्रश्न
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
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उत्तर
Physical change: Melting of candle wax, mixing of iron filings and sand, Breaking a piece of chalk, and Cutting a piece of paper.
Chemical change: Burning of candle wax, burning of wood, and Burning a piece 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.
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Chemical changes are accompanied by changes in energy.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
______ is the substance that is dissolved in a solvent.
Iron pipes coated with zinc do not get rusted easily.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
