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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 |
State whether the following is physical or chemical changes.
shaping a piece of glass —
State whether the following is physical or chemical changes.
mixing oil with water —
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
Select the chemical changes from the following list of changes
Drying of a fruit
Select the chemical changes from the following list of changes
The occurrence of lightning.
______ is the substance that is dissolved in a solvent.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
