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ICSE Class 8 Answered

how do these metals react with water ? explain the experimental conditions  write balanced equationa)sodium   b) magnesium   c) aluminium  d)iron   e) zinc   f) copper 
Asked by nathsantanukumar | 23 Aug, 2018, 05:56: PM
answered-by-expert Expert Answer

Reaction of Metals with Water:

Metals react with water and produce metal oxide with the release of hydrogen gas. However, all metals do not react with water.

Metal oxides which are soluble in water dissolve to form hydroxide.

       Metal     +     Water    →   Metal oxide   +  Hydrogen

 

Metal oxide    +    Water   →     Metal hydroxide\

 
 1. Metals such as sodium and potassium react vigorously with cold water to evolve hydrogen which immediately catches fire producing a lot of heat.
 

                   2 straight K space space plus space 2 straight H subscript 2 straight O space rightwards arrow space 2 KOH space space plus space straight H subscript 2 space space plus space Heat

2 Na space plus space 2 straight H subscript 2 straight O space space space rightwards arrow space 2 NaOH space space plus space straight H subscript 2 space plus space Heat

2.  Magnesium does not react with cold water but reacts with hot water to form magnesium hydroxide with the evolution of hydrogen gas.

                       

                     Mg space plus space 2 straight H subscript 2 straight O space rightwards arrow space Mg left parenthesis OH right parenthesis subscript 2 space plus space straight H subscript 2 space space

 

3.  Metals such as aluminium, zinc, and iron do not react with cold or hot water, but they react with steam to form a metal oxide and hydrogen.

 

                    2 Al space plus space 3 straight H subscript 2 straight O space space rightwards arrow space Al subscript 2 straight O subscript 3 space plus space 3 straight H subscript 2

3 Fe plus space 4 straight H subscript 2 straight O space rightwards arrow space Fe subscript 3 straight O subscript 4 plus space 4 straight H subscript 2

Answered by Varsha | 24 Aug, 2018, 12:35: PM
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