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प्रश्न
Name two reversible changes.
उत्तर
Melting of ice.
Dissolving of salt in water.
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संबंधित प्रश्न
Classify the following changes as physical or chemical:- photosynthesis in plants
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Write true or false
Cutting of paper into pieces is a chemical change.
Give two examples of periodic changes.
State the Differences Between a Physical Change and a Chemical Change.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Match the items of Column I with the items of Column II
| Column 1 | 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 |
