Advertisements
Advertisements
Question
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Advertisements
Solution
Freezing of water to ice and evaporation of water are physical change because water can be brought back to its original (liquid) form by
- We can heat the ice to bring it back to water.
- We can cool down the vapours to bring it back to water.
APPEARS IN
RELATED QUESTIONS
State the various conditions that favour the process of evaporation.
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
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as physical or chemical change :
Condensation of steam
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
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.
Cutting a log of wood into pieces is a chemical change.
