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- Which one of these reactions would be best classified as irreversible? a) FeCO3(s) ⇌ Fe2+(aq) + CO32-(aq) K = 2.1 × 10-11 b) HC2H3O2(aq) + OH-(aq) ⇌ C2H3O2-(aq) + H2O(l) K = 1.8 × 10^9 c) Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq) K = 215 d) 2SO2(g) + O2(g) ⇌ 2SO3(g) K = 4.32Indicate how the reaction rate changes in the following instances: a)Increasing the temperature from 60°C to 80°C b)Adding KI as catalyst in the decomposition of peroxide c) Increase the concentration of compound C in the reaction: aA + bB → cC + dD d) Increase the concentration of compound B in the reaction: aA + bB → cC + dDThe stoichiometric equation for the oxidation of bromide ions by hydrogen peroxide in acidsolutions is 2 Br– + H2O2 + 2 H+ → Br2 + 2 H2O ? = ?[H2O2][H+][Br−] If the concentration of H2O2 is increased by a factor of three, by what factor is the rate ofconsumption of Br– ions increased?
- IDENTIFY the following types of cheimcal reaction: S + O2 = SO2Indicate the factors that affect the rate of chemical reactions and explain. 1. Copper oxide speeds up the decomposition of H2O2 (hydrogen peroxide) 2. Grinding of calcium carbonate before calcining.Given: 2 NO + O2 → 2 NO2 Expt NO O2 Rate 1 0.04 0.02 0.227 Rate = k [NO]2 [O2] What is the value of the specific rate constant, k? 283,8 7, 094 1.410 X 10-4 7.264 X 10-6 14,188
- You have studied the gas-phase oxidation of HBr by O2:4 HBr(g) + O2(g) -->2 H2O(g) + 2 Br2(g) You find the reaction to be first order with respect to HBrand first order with respect to O2. You propose the followingmechanism:HBr(g) + O2(g) ---> HOOBr(g) HOOBr(g) + HBr(g) --->2 HOBr(g) HOBr(g) + HBr(g) ----> H2O(g) + Br2(g) (a) Confirm that the elementary reactions add to give theoverall reaction. (b) Based on the experimentally determinedrate law, which step is rate determining? (c) Whatare the intermediates in this mechanism? (d) If you areunable to detect HOBr or HOOBr among the products,does this disprove your mechanism?Which factor does NOT play a role in controlling the rate of a chemical reaction? i.) the frequency of collisions ii.) the fraction having sufficient energy to react. iii.) the overall delta H reaction iv.) the proper orientationBromomethane is converted to methanol in an alkaline solution. The reaction is first order in each reactant.CH3Br(aq)+OH−(aq)→CH3OH(aq)+Br−(aq) How does the reaction rate change if the OH− concentration is decreased by a factor of 7?
- 3A. The gas-phase decomposition of acetic acid at 1189 K proceeds by way of two parallel reactions: (1) CH3COOH ® CH4 + CO2k1=3.74 s-1 (2) CH3COOH ® H2C=C=O + H2Ok2=4.65 s-1 Compute the percent yield of ketene (H2C=C=O) at this temperature.Using the graph below, determine the time it will take for half of the reagent present at t = 60 sec to react. b. 196 s c. 256 s d. 120 s e. 60 sA reversible reaction that occurs in a single step has ΔH = -17.8 kJ/mol and Ea = 37.7 kJ/mol. What is the activation energy of the reverse reaction?