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प्रश्न
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
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उत्तर
Preparation of carbon dioxide from calcium carbonate and dilute hydrochloric acid is a CHEMICAL change as new K substance with new properties is formed, the change is permanent and irreversible.
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संबंधित प्रश्न
Write short answer.
What are man-made changes ?
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 :
Breaking of a glass tumbler
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.
Slow and fast change.
Select the chemical changes from the following list of changes
The carbon cycle.
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. |
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
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The change of state of a substance from solid to liquid and liquid to gas is ______.
