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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
Write true or false for the statement
A natural change can also be a desirable change
Write short answer.
Name two reversible changes.
Classify the following changes as physical or chemical:- melting of a solid (wax)
Classify the following as physical or chemical change :
Growth of a plant
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
______ is the Universal Solvent.
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 |
Which of the following is not a physical change?
Cutting a log of wood into pieces is a chemical change.
