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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
What role does energy play in initiating a chemical change ?
State whether the following is physical or chemical changes.
glowing of a bulb -
State whether the following is physical or chemical changes.
shaping a piece of glass —
Write true or false
Rusting of iron is a chemical change.
True or false
Is melting of ice a reversible change?
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Distinguish physical and chemical changes.
When solute is dissolved in a solvent it forms a solution.
Which of the following is a physical change?
