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प्रश्न
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
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उत्तर
Wax [CxHy]
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Photosynthesis cannot take place at night.
Classify the following changes as physical or chemical:-boiling
State four differences between physical and chemical changes.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Select the chemical changes from the following list of changes
Boiling of milk.
Filling up a balloon with hot air is a _______ change.
______ is the substance that is dissolved in a solvent.
Give two examples for the following case:
Physical changes which are reversible
