Advertisements
Advertisements
Question
State the Differences Between a Physical Change and a Chemical Change.
Advertisements
Solution
State the differences between a physical change and a chemical change.
| Property | Physical change | Chemical Change |
| Formation of new | There are no new substan | New substances with different |
| substance | ces formed in a physical change. | properties are formed in a chemical changes. |
| Nature of change. | It is usually easy to reverse the process, thereby regain -ing the original substance. | It is usually irreversible. |
| Energy | Generally energy is neither absorbed nor evolved. | Considerable heat energy is either absorbed or evolved when a chemical change takes place. |
| Mass | There is no change in the mass of the substance after a physical change. | Mass of a substance changes after a chemical change. |
APPEARS IN
RELATED QUESTIONS
Try segregating the things around you as pure substances or mixtures.
Write short answer.
Sublimation is classified as a physical change. Why ?
State three differences between evaporation and boiling
Classify the following changes as physical or chemical.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
What type of change is colouring of a paper?
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
