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प्रश्न
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
उत्तर
Change is the law of nature that occurs in everyday life. A substance [i.e. matter] undergoes a kind of change when subjected to energy changes.
The matter is said to undergo certain changes when energy is added to the matter or removed from the matter.
Examples of Changes are:
- Ice melts on supplying heat to it.
- Milk changes into curd when a little curd is added to hot milk.
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संबंधित प्रश्न
What role does energy play in initiating a chemical change ?
State whether the following is physical or chemical changes.
photosynthesis —
State the various conditions that favour the process of evaporation.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
