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- A. Determine whether the curved arrow(s) shown below generate a valid or invalid resonance structure. Draw the resonance structure that would result from each properly drawn arrow and identify the arrow pushing pattern (i.e. allylic positive charge, allylic lone pair, pi bond between atoms of a different electronegativity, lone pair adjacent to a positive charge, alternating pi bonds in a ring.(a) (c) HO OH 1. BH3 2. H₂O₂, NaOH 3. PCC 4. CH3MgBr 5. H3O+ workup Na₂Cr₂O7 H₂SO4, H₂OChemists working with fluorine and its compounds some- times find it helpful to think in terms of acid-base reac- tions in which the fluoride ion (F¯) is donated and ассеpted. (a) Would the acid in this system be the fluoride donor or fluoride acceptor? (b) Identify the acid and base in each of these reactions: CIF;O2 + BF; CIF,O, · BF, -- TiF, + 2 KF – K2[TiF,]
- 18. (a) Molecule N₂H4 (1) + 2 H₂O2 (1) → N2(g) + 4 H₂O (1) Complete the following table: Lewis Dot Structure (use dots or lines to show bonds) (b) (c) (d) N₂H4 H₂O2 N₂ H₂O Calculate the AH°rxn using average bond energies (Table 9.4 in textbook) Calculate the AH°rxn using the standard enthalpies of formation (Appendix 2 in textbook) Why are these two values slightly different?5 ml of a 0.2 M NH3 solution are added to 5 ml of a 0.1 M NH4Cl solution (Kb for NH3 is = 1.8 × 10-5). Calculate: a) the pH of the resulting solution; b) the ΔpH due to the addition of 5 ml of a 0.01 M HNO3 solution to the solution resulting from part a); c) the ΔpH due to the addition of 10 ml of water to the solution resulting from part a)Write the expression Kc for the following reactions. (a) Fe2+(aq) + Ce4+(aq) ⇋ Fe3+(aq) + Ce3+(aq) (b) CaCO3(s) ⇋ CaO(s) + CO3(g)
- O-H H CH,OH (b) CH2 CH, NH, H--0=C (b) 0-H-- (a) CH, CH, CH, CH H-C CH, (CH.)4–NH, CH, CH, |(d) (a) CH, (d) (c) CH, CH, HC CH CH, CH,COOH (b) [The image above is from a different textbook. Ask me later if you would like to know the reference.] The image above depicts protein tertiary structure. What type of tertiary structure is represented by the letter (d) in the image? O hydrogen bonding 3 of these 4 responses are correct. O disulfide linkage O hydrophobic interaction salt bridgeThe value of Ka for nitrous acid 1HNO22 at 25 °C is given in Appendix D. (a) Write the chemical equation for the equilibrium that corresponds to Ka.The emission of NO, by fossil fuel combustion can be prevented by injecting gaseous urea into the combustion mixture. The urea reduces NO (which oxidizes in air to form NO2) according to the reaction: 2 CO(NH;)»(3) + 4 NO(3) + O2(8) 4 Na(8) + 2 CO;(g) + 4 H¿O(g) Suppose that the exhaust stream of an automobile has a flow rate of 2.55 L/s at 655 Kand contains a partial pressure of NO of 12.4 torr. What total mass of urea is necessary to react complete- ly with the NO formed during 8.0 hours of driving?
- Determine, at 298 K, Δr1H0, the standard enthalpy of the reaction (1) between hydroquinone with hydrogen peroxide to produce quinone. C6H4(OH)2(aq) + H2O2(aq) → C6H4O2(aq) + 2 H2O (ℓ) (1) Knowing the standard reaction enthalpies, at 298 K, of the following reactions: (2) C6H4(OH)2 (aq) → C6H4O2 (aq) + H2 (g) ; Δr2H0 = + 177.4 kJ mol−1 (3) H2 (g) + O2 (g) → H2O2 (aq) ; Δr3H0 = −191.2 kJ mol−1 (4) H2 (g) + ½O2 (g) → H2O (g) ; Δr4H0 = −241.8 kJ mol−1 (5) H2O (g) → H2O (ℓ) ; Δr5H0 = −43·8 kJ mol−1For a reaction with ΔH° = 40 kJ/mol, decide which of the following statements is (are) true. Correct any false statement to make it true. (a) The reaction is exothermic; (b) ΔG° for the reaction is positive; (c) Keq is greater than 1; (d) the bonds in the starting materials are stronger than the bonds in the product; and (e) the product is favored at equilibrium.9-4. For each of the following reactions: (1) Calculate the enthalpy change for the reaction using Standard Enthalpy of Formation values from the table posted on the Course Resources page. (2) State whether the reaction is endothermic or exothermic. а. 3 Са0() + 2 Feе(s) > Fe,0%3(s) +3 Сa('s) b. 2 C;Ho(g) + 7 02(g) → 4 CO2(g) + 6 H2O()