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Make up 3-solutions - Version 057 Make up 3 laude(51635...

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Version 057 – Make up 3 – laude – (51635) 1 This print-out should have 40 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 6.0 points Which of the following is not commonly used to protect the world from rust? 1. sacrificial electrodes 2. salt washings correct 3. oxide coatings 4. galvanization Explanation: Salt washings would actually accelerate ox- idative processes. 002 6.0 points Consider the reaction mechanism below: Step Reaction 1 Cl 2 + Pt -→ 2 Cl + Pt 2 Cl + CO + Pt -→ ClCO + Pt 3 Cl + ClCO -→ Cl 2 CO overall Cl 2 + CO -→ Cl 2 CO Which species is/are intermediates? 1. Pt 2. Cl, ClCO correct 3. Pt, ClCO 4. Cl 5. ClCO 6. Pt, Cl Explanation: Both Cl and ClO are produced in early steps and stiochiometrically consumed in sub- sequent steps and neither appear in the overall reaction. 003 6.0 points The structure of the polymer rubber is C H H C CH 3 C CH 2 H n What is the formula of the monomer used to produce rubber? 1. CH 3 CCCH 3 2. (CH 3 ) 2 CCHCH 3 3. CH 3 CH(CH 3 )CH 2 CH 3 4. CH 2 C(CH 3 )CHCH 2 correct 5. CH 2 CCCH 2 Explanation: Natural rubber is cis 1,4-polyisoprene, an addition polymer of isoprene (2-methylbuta- 1,3-diene). The monomer is C H H C CH 3 C H C H H 004 6.0 points Transition state theory states that 1. a set of reactants must achieve their tran- sition state before forming products. correct 2. temperature does not a ff ect rate. 3. molecules must collide in order to react. 4. intermediates are short-lived. Explanation: TST states that a reactant (or set of re- actants) must achieve their transition state (also called activated complex) before form- ing products. The transition state is inher- ently short-lived as it is in quasi-equilibrium with the reactant(s) ground state and either
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Version 057 – Make up 3 – laude – (51635) 2 rapidly decays back to the ground state or goes on to form products (this is treated as irreversible for the purposes of TST). 005 6.0 points Consider the data below: [NO] [CO 2 ] initial rate M M M · s - 1 Exp 1 0 . 4 1 . 2 2 . 178 × 10 - 1 Exp 2 0 . 8 2 . 4 8 . 572 × 10 - 1 Exp 3 0 . 4 0 . 6 2 . 178 × 10 - 1 Which of the following is a correct rate law for the reaction? 1. k · [NO] · [CO 2 ] 2. k · [NO] 2 correct 3. k · [CO 2 ] 2 4. k · [NO] 5. k · [CO 2 ] 2 [NO] - 1 Explanation: rate 1 rate 3 = [CO 2 ] 1 [CO 2 ] 3 x 2 . 178 × 10 - 1 2 . 178 × 10 - 1 = 1 . 2 0 . 6 x x = 0 rate 1 rate 2 = [NO] 1 [NO] 2 y 2 . 178 × 10 - 1 8 . 572 × 10 - 1 = 0 . 4 0 . 8 y y = 2 006 6.0 points What is the original source of nitrogen in the Ostwald process for the production of nitric acid? 1. NH 3 correct 2. NO 3. NO 2 4. N 2 Explanation: The Ostwald process occurs in 3 stages. The first converts ammonia and oxygen into nitrogen monoxide and water 007 6.0 points What are the starting material and product, respectively, of the Claus process? 1. S and SO 2 2. H 2 S and S correct 3. S and H 2 SO 4 4. H 2 S and H 2 SO 4 5. SO 2 and H 2 SO 4 Explanation: The Claus process is the most significant gas desulfurizing process, recovering elemen- tal sulfur from gaseous hydrogen sulfide.
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