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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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What is meant by Concentration of the reactants.

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Concentration of the reactants 

let us consider the reaction of dilute and concentrated hydrochloric acid with CaCO3 powder.
Dilute HCL reacts slowly with CaCO3 and thereby CaCO3 disappear slowly and CO2 also liberates slowly. on the other hand the reaction with concentrated HCL takes place rapidly and CaCO3 disappear fast.
Concentrated acid reacts faster than dilute acid, which means that the rate of a reaction is proportional to the concentration of reactants.
 
d. Temperature of the reaction. 
While studying decomposition reaction, you have carried out decomposition of lime stpne
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