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प्रश्न
State the Differences Between a Physical Change and a Chemical Change.
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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. |
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संबंधित प्रश्न
State the differences between a physical change and a chemical change.
What is a physical change ? Give two examples of physical changes.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
What will you take into account while identifying the following?
A physical change in a substance.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
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.
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Sublimation of Iodine is a ______.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
Grinding of wheat grain changes its size. It is a ____________ change.
