Delta S degree for the reaction CaCO_2(s) rightarrow CaO(S) + CO_2 is likely A.

Question

Delta S degree for the reaction CaCO_2(s) rightarrow CaO(S) + CO_2 is likely A. 0 b) 0 d) = Delta H degree E. = Delta G degree The dissolution of ammonium nitrate in water at room temperature is a spontaneous endothermic process. It is spontaneous because the system undergoes. A. a decrease in enthalpy. B. an increase in entropy. C. an increase in temperature D. a decrease in entropy E. an increase in free energy. Which is correct for an endothermic reaction that has a positive entropy change, Delta S? The reaction is A. spontaneous at all temperatures. B. non spontaneous at all temperatures C. spontaneous at low temperatures but could become non spontaneous at higher temperatures D. non spontaneous at low temperatures but could become spontaneous at higher temperatures What is the oxidation number of Mo in MoO_s^2? A. +10 B. +8 C. +6 D. +4 This equation describing a cell reaction Ag^+ (aq) + Cu(s) rightarrow Cu^2+ (aq) + Ag(s) A. is not balanced because there should be a free electron on the right side. B. is balanced because there is one copper and one silver on each side. C. is not balanced because charge needs to be balanced. D. cannot be balanced. A voltaic cell prepared using aluminum and nickel has the following cell notations. Al(s) [A]^3+(aq) || Ni^2+(aq) | Ni(s) Which of the following represents the correctly balanced spontaneous reaction equation for the cell? A. Ni^2+(Aq) + Al(s) rightarrow Al^3+(aq) + Ni(a) B. 3Ni^2+(aq) + 2Al(s) rightarrow 2Al^2+ (aq) + 3Ni(s) C. Ni(s) + Al^3+ (aq) rightarrow Ni^2+ (aq) + Al(s) D. 3Ni(s) + 2Al^3+(aq) rightarrow 3Ni^2+(aq) + 2Al(s) E. None of these choices is correct.

Explanation / Answer

Q31

dS = Sprod - Sreact

dS = CaO + CO2 - CaCO3

note that 1 mol of solid is forming 2 moles

and 1 mol of those is gas

so chaos increases drastically, it must be dS > 0

due to disorde rincreasing

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