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प्रश्न
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
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उत्तर
Heating a piece of iron is considered a physical change while heating a piece of coal [carbon] is considered a chemical change.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Melting of solid (wax) is a physical change.
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Write true or false
Rusting of iron is a chemical change.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Select the chemical changes from the following list of changes
Rotting of eggs.
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. |
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Adding sugar to milk is a physical change.
