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chem hw 4 - lawrence(cdl678 Homework#4 Holcombe(52460 This...

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lawrence (cdl678) – Homework #4 – Holcombe – (52460) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points For the heterogeneous reaction 2 MnO 2 (s) 2 MnO(s) + O 2 (g) , the equilibrium constant expression for K c is which of the following? 1. K c = [MnO 2 ] [MnO] [O 2 ] 2. K c = [MnO] [O 2 ] [MnO 2 ] 3. K c = [O 2 ] correct 4. K c = k [MnO 2 ] 5. K c = 1 [O 2 ] Explanation: For heterogeneous reactions, only gaseous reactants and species are taken into considera- tion when writing K c expressions. Therefore, K c = [O 2 ]. 002 10.0 points Which of the following is TRUE? 1. A large value of K means that the equi- librium concentrations of products are large compared to the equilibrium concentrations of the reactants. correct 2. When the value of K is small, the equi- librium lies on the product side of the equilib- rium reaction. 3. When the value of Q is large, the equilib- rium lies on the product side of the equilib- rium reaction. 4. When the value of K is large, the equilib- rium lies on the reactant side of the equilib- rium reaction. 5. A small value of K means that the equilib- rium concentrations of the reactants are small compared to the equilibrium concentrations of the products.
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