Advertisements
Advertisements
प्रश्न
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Advertisements
उत्तर
Yes, I can. It is a physical (reversible) change.
APPEARS IN
संबंधित प्रश्न
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
burning of sugar —
Write true or false
Cutting of paper into pieces is a chemical change.
Write true or false
Melting of ice is a physical 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.
Glowing of an Electric Bulb
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical 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.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Give two examples for the following case:
Physical changes which are not reversible
