Advertisements
Advertisements
Question
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Advertisements
Solution
- Wood cannot be joined again to form the original piece, but its properties do not change.
- This is a physical change. Wood cannot be restored to its original form after burning.
- Its properties also change, and heat is produced. This is a chemical change. Here, there are two different states of burning the wood and cutting it into small pieces.
- In this situation, two different types of changes are considered.
APPEARS IN
RELATED QUESTIONS
Photosynthesis cannot take place at night.
Write short answer.
What are man-made changes ?
Classify the following changes as physical or chemical:-boiling
Is burning a physical change or a chemical change? Why?
State whether the following is physical or chemical change.
Digestion of food —
Classify the following as physical or chemical change :
Formation of curd from milk
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.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
