Advertisements
Advertisements
प्रश्न
Give two examples for the following case:
Physical changes which are reversible
Advertisements
उत्तर
- Folding of paper
- Melting of ice
APPEARS IN
संबंधित प्रश्न
Give two examples of periodic changes.
What are man-made changes ?
Make a list of different types of changes with example.
Classify the following as physical or chemical change :
Formation of curd from milk
Which of the following are physical changes and which are chemical changes ?
Freezing of water
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
