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प्रश्न
Select the chemical changes from the following list of changes
Drying of a fruit
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उत्तर
Drying of fruit is PHYSICAL change as composition remains the same and only state changes, no new substance with new properties is produced.
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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 the various conditions that favour the process of evaporation.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
What is a physical change ? Give two examples of physical changes.
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.
Desirable and undesirable change.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :
- Sublimation.
- Fermentation.
- Liquefaction or condensation.
- Magnetization.
- Respiration.
