2) AS is positive for the reaction (163) ) +0200 2H8O(s) C) 2NO2 (g) N204 (g) D)
ID: 104900 • Letter: 2
Question
2) AS is positive for the reaction (163) ) +0200 2H8O(s) C) 2NO2 (g) N204 (g) D) BaF2 (s)Ba (aq) 21- (q) 3) Which of the following is the correct solublity product constant, Kup expression y of silver carlsonate in water if the solubility-product consta for this the molar solubility of silver carlonate in water if the solubility-preduct in the molar 1+ 10-12 at 25 °C? Adding Nad03 (s) to this equilibrium would result in ain)-- solubilty of silver carbonate (15.1) IPbP ICOs 1,2710-12, increase B) Ksp- Ag* ICO3-1 1.3 10-4, decrease Ksp-[Ag*) [CO32- 1.3-10-4 , increase D) Ksp 15*1 [Co23-1. 1.4 10-6, decrease AgP ICO21,20-10-4, increas p01Auco solaitand 1C032-1- 12 x 10-7 M. The reaction quotient, Q, is -, and the equilibrium will (15. 2) , A) 2.0x 10-1, dissolve Cdco B) 57 x 10-11, precipitate Cdcos )2.6x 10-2 precipitate Cdco3 D) 70x 1011, dissolve CdCOs E) 3.0 x 10-1I, precipitate CdCO3 5) The Zn2+ reacts with aqueous ammonia, NH3, to form [Zn(NH3)42+ according to the following reaction: Zn2+(aq) + 4NH3(aq) [Zn(NH3l4l2+(aq) The product of this reaction is a(n) and is called a(n)(15.4) A) ligand, adduct B) adduct, complex ion C) base, compound D) acid, chelate E) compound, complex ionExplanation / Answer
Entropy is randomness of the system
1- Change in Entropy is positive when the entropy of product is greater then Entropy of reactant.
2- Entropy of a gas is always greater then a liquid which in turn is greater then a solid.
3- if the product is a gas then Entropy will always be positive.
Hence,
In first reaction since one of the reactant is a gas and product is a solid, the entropy change will be negative.
In second reaction: the reactant side has two reactants which are gases while the product side has only one gas therefore, negative
Simillarly, In the third reaction entropy change is negative.
In the fourth reaction; reactant is solid but the products are in aqeous phase, that is in this case entropy change is positive.
In fifth reaction, the product is a solid and reactant a gas, therefore, the entropy change is negative.
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