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प्रश्न
State whether the following is physical or chemical changes.
respiration in living beings —
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उत्तर
chemical change,
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
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 |
How do you say that the process of digestion is a chemical change ?
Which of the following are physical changes and which are chemical changes ?
Freezing of water
The rusting of an iron object is called :
Fill in the blank.
The process of a liquid changing into a solid is called ________
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
Give an example of a physical change in which the color of the substance changes.
