Advertisements
Advertisements
प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
विकल्प
Chemical change
Physical change
Advertisements
उत्तर
Chemical change
Explanation:
The passage of electric energy through water to form hydrogen and oxygen gases is a chemical change because the properties of hydrogen (a combustible gas) and oxygen (a supporter of combustion) are completely different from those of water, which is neither combustible nor a supporter of combustion but does extinguish the fire.
संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State four differences between physical and chemical changes.
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
mixing oil with water —
True or false
Change of seasons is a non-periodic change.
Classify the following as physical or chemical change :
Growth of a plant
Select the chemical changes from the following list of changes
Boiling of milk.
When ice melts to form water, change occurs in its
______ is the substance that is dissolved in a solvent.
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.
