Advertisements
Advertisements
प्रश्न
State the Differences Between a Physical Change and a Chemical Change.
Advertisements
उत्तर
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
संबंधित प्रश्न
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Dissolving salt in water is a reversible change.
Make a list of different types of changes with example.
Give the main differences between physical changes and chemical changes.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
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 of iodine is an example of _________ 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.
Stretching gold coin into a ring is a ______ change.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
