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The outer surface of a beaker containing ice cubes becomes wet in short while - Give scientific reason.

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Question  The outer surface of a beaker containing ice cubes becomes wet in short while. Answer  When ice cubes are placed in a beaker, ice starts melting.  The heat required for melting is absorbed from the surrounding air and also from the beaker to some extent.  Hence, the temperature of the air and beaker falls.  The capacity of air to hold water vapour depends upon the temperature of the air, and this capacity decreases as the temperature decreases.  At a certain low temperature, the surrounding air becomes saturated with water vapour present in it.  As the temperature falls further, the air is unable to hold all the water vapour.  Hence, the extra water vapour starts condensing on the cold outer surface of the beaker in the form of minute drops.  Therefore, The outer surface of the beaker containing ice cubes becomes wet in a short while.
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While going down the second group, the reactivity of the alkaline earth metal increase.

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Question

While going down the second group, the reactivity of the alkaline earth metal increase. 

Answer

The reaction of alkaline earth metal with water is M + 2H2O - M(OH)2 + H2.
While going down the second group as Be - Mg - Ca - Sr - Ba, the graduation in this chemical property of the alkaline earth metal is seen. 


While going down the second group the reactivity of the alkaline earth metal goes on increasing thereby the ease with which the reaction takes place also goes on increasing. Thus, beryllium (Be) does not react with water. Mg (Magnesium) reacts with steam. whereas calcium (Ca), strontium (Sr) and Barium (Ba) reacts with water at room temperature with increasing rates.

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