Advertisements
Advertisements
प्रश्न
A physical change is temporary. Explain.
Advertisements
उत्तर
A physical change is defined as a change in which no new substance is formed.
A physical change is temporary because this change can be easily reversed by reversing the conditions. For example when ice is melted, it gets converted into water by absorbing heat. Water so formed can be easily converted to ice by cooling thus heat is released. Thus physical change is temporary.
APPEARS IN
संबंधित प्रश्न
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
State whether the following is physical or chemical changes.
water cycle in nature —
Which of the following are physical changes and which are chemical changes ?
Classify the following as a physical or a chemical change.
Melting of wax
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Is a change of state of matter – a physical or a chemical change. Give reasons.
Select the chemical changes from the following list of changes
Boiling of milk.
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
- Making sugar solution is a ______ change.
- A physical change is generally ______.
- Grinding of wheat grain changes its size. It is a ______ change.
- Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.
