5th Class Science Matter and Materials Separation of Mixture

         Separation of mixture  

          Interconnection of the different states of the matter

SOLID                        LIQUID                      GAS  

         Releasing heat                                   releasing (heat)    

         Melting (heat)                               vaporization (heat)      

The above mentioned examples are physical change that can be brought back either by giving or loosing heat- Physical change is reversible. Burning of paper is a chemical change as ash can't be brought back to paper by any means. Chemical change is irreversible.  

Rusting of Iron                                     Burning Paper  

Growth from an infant to an adult is an irreversible change.  

      Which of the following plays an important role In the process of changing one state of matter into another?

(a) Heat

(b) Volume

(c) Mass

(d) Density

(e) None of these

Answer: (a)

Explanation

One state of matter is converted into another form either by taking or releasing heat energy. Therefore, option (a) is correct and rest of the options is incorrect.

      Which one of the following is an example of liquid state of matter?

(a) Air

(b) Soil

(c) Water

(d) All of these                                 

(e) None of these

Answer; (c)

Explanation

Water is an example of liquid stale of matter. Therefore, option (c) is correct and rest of the options is incorrect.