![]() June 2008- 45 Which 1-mole sample has the least entropy? (4) It is exothermic, and entropy increases.Īug 2009- 45 The entropy of a sample of H 2O increases as the sample changes from a (3) It is exothermic, and entropy decreases. (2) It is endothermic, and entropy increases. (1) It is endothermic, and entropy decreases. Jan 2010 44 Given the balanced equation representing a phase change: SeptemChristian Right Lobbies To Overturn Second Law Of Thermodynamics Solid and liquid becomes a solution and gasĬ 2H 5OH(l) + 3O 2(g) -> 2CO 2(g) + 3H 2O(g) A process where a solid changes to a liquid or gas or a liquid changes to a gasĮxamples-Highlight the boxes to reveal the answer and reasoning.Ģ NaHCO 3(s) -> Na 2CO 3(s) + H 2O (g) + CO 2(g)ĢNH 3(g) + CO 2(g) -> NH 2CONH 2(aq) + H 2O(l)ĢNa 2O 2(s) + 2H 2O(l) -> 4NaOH(aq) + O 2(g).A reaction occurs in which there is an increase in the moles of gas in the product.A reaction breaks up a larger molecule into smaller molecular fragments.***Entropy increases will be observed when any one or more of the following occur: The entropy change of a reaction is given the symbol ΔS, units when used are J/mol K (not kJ). For instance a mixture of two different gases will have greater entropy than the sum of the entropies of the two gases alone. In this example there are two moles of gas on the right hand side and only one mole of gas on the left hand side - the entropy increases going from left to right (reactants to products).ĭisorder can also arise by mixing different components. If the number of moles of gas increases in a chemical reaction (as shown by the stoichiometry of the reaction) then the entropy also increases. Solids < Liquids < Aqueous Solutions < Gases Solutions have a greater entropy than pure liquids as the particles in a solution are more separated and solvent molecules separate the solute particles. Liquids have much lower entropies and solids lower still. Gas particles have random motion have high entropy values. ![]() This is considered to be the degree of disorder of a system. ![]()
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