Physical and Chemical Change
Physical and Chemical Change
There can occur two type of changes in a substance. These changes are Physical and Chemical changes.
Physical Changes :
Physical changes are the changes in which no new substance is formed. E.g. the formation of ice from water is a physical change. Physical changes are most of the times for a short span of time, better we can say these changes are temporary and can be reserved. Hence physical change can be defined as: A physical change is the one that changes the shape, size, physical state or appearance of substance but not its chemical composition.
Characteristics of a physical change :
Examples of physical change :
Formation of dew, Drying if wet clothes, Breaking of glass, Bending of glass tube, Sublimation of iodine, Crushing of iron, Melting of wax, Crystallization of sugar, Beating aluminum to make aluminum foil , Cutting of nails
Chemical Change :
A chemical change occurs when two or more chemical substances react to produce new substance with a different set of properties. It is permanent which cannot be reversed.
Characteristics of chemical change :
Example of chemical change :
Rusting of iron, Burning of candle, Digestion of food, Burning of food, Decomposition of water, Curdling of milk, Butter turning rancid, Ripening of fruit, Drying of paint, Change in color of an apple cut into halves, Clotting of blood, Changes in color of brinjal slice, Digestion of food, Acid base neutralization reaction, Photosynthesis, Removing cream from milk.
Which of the following are correct : (a) Physical change is reversible and temporary. (b) The chemical change is irreversible and permanent. (c) The composition of a substance changes during a chemical change. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following is an example of chemical change ? | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) No loss or gain of energy takes place during a physical change. (b) No change in mass occurs during a physical change (c) Either heat is absorbed or evolved during a chemical change. | |||
| Right Option : D | |||
| View Explanation | |||
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Om Umang
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
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Cheshta
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