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प्रश्न
Try segregating the things around you as pure substances or mixtures.
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उत्तर
- Pure substance: Distilled water, diamond; graphite, gold, sulphur.
- Mixture: Curd, ice cream, kerosene oil, cooking oil, steel, vulcanised rubber, solder wire (an alloy of lead and tin).
संबंधित प्रश्न
Write short answer.
Give an example of desirable change which can also be undesirable
Write short answer.
Sublimation is classified as a physical change. Why ?
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
True or false
Is melting of ice a reversible change?
State the various conditions that favour the process of evaporation.
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
When ice melts to form water, change occurs in its
