Advertisements
Advertisements
प्रश्न
What is a physical change ? Give two examples of physical changes.
Advertisements
उत्तर
Physical change: These are changes in which no new substances are formed. These are temporary changes, which are easily reversible. The substance, which is involved in a physical change, does not lose its identity.
Examples:
- Water, if boiled, can be cooled and condensed.
- Mixing of iron fillings with sand is a physical change because they can be separated by a magnet.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Write true or false for the statement.
Deforestation is a man-made change
A burning candle shows both physical and chemical changes. Explain ?
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Write true or false
A natural change can also be a desirable change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Classify the following as a physical or a chemical change.
Drying of wet clothes
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
