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प्रश्न
Try segregating the things around you as pure substances or mixtures.
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उत्तर
- Pure substance: Distilled water, diamond; graphite, gold, sulphur.
- Mixture: Curd, ice cream, kerosene oil, cooking oil, steel, vulcanised rubber, solder wire (an alloy of lead and tin).
संबंधित प्रश्न
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Fill in the blank.
Growing of a seedling into a plant is _______ change.
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Sublimation is classified as a physical change. Why ?
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
Explain the characteristics of physical change with examples.
