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प्रश्न
State whether the following is physical or chemical changes.
photosynthesis —
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उत्तर
chemical change.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Fill in the blank.
An earthquake is a .................. change.
State whether the following is physical or chemical changes.
burning of sugar —
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Define a chemical change. Give two examples of the above changes.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Select the chemical changes from the following list of changes
The occurrence of lightning.
Name the following.
A form of energy required for a chemical change.
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 |
