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प्रश्न
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
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उत्तर
Is a chemical change as sulphur (yellowish-green) on burning produces SO2 gas which is acidic in nature and a new substance with new properties is formed
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संबंधित प्रश्न
Write true or false
A natural change can also be a desirable change.
What are man-made changes ?
Make a list of different types of changes with example.
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.
Periodic and non-periodic change
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
Which of the following is not a physical change?
Explain the characteristics of physical change with examples.
