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- The following two reactions involve proton transfer. In each reaction, identify the acid and the base. Identify the conjugate base of the acid, and the conjugate acid of the base. Draw Lewis electron dot diagrams for each molecule, and describe the rear- rangement of bonding in the reaction as nonbonding electron pairs become cova- lently shared pairs and vice versa. (a) H¿O(€) + NH (aq) → H;0* (aq) + NH3(aq) (b) CH;CH;OH(aq) + NH7 (aq) → CH;CH;O¯(aq) + NH3(aq)[References] Calculate AH for the reaction: 2NH3 (g) + O2(g) → N2H4 (1) + H2O(1) given the following data: 2NH3 (g) + 3N2O(g) → 4N2(g) + 3H2O(1) AH =–1010. kJ N2O(9) + ЗH2(9) — N;Ha (1) + Hа0(1) ДН %3D — 317 kJ N2H4 (1) + O2 (9) → N2(g)+2H20(1) ΔΗ--623 k.J На (9) + О2(9) — Н,0(1) AH = -286 kJ ΔΗ- kJ Submit Answer Try Another Version 3 item attempts remainingSelect which of the following products would be made by the chemical transformation indicated below: H₂ Lindlar's cat.
- (a) (c) HO OH 1. BH3 2. H₂O₂, NaOH 3. PCC 4. CH3MgBr 5. H3O+ workup Na₂Cr₂O7 H₂SO4, H₂O(1) two baking sheets are made of different metals. you purchase both and bake a dozen cookies on each sheet at the same time in your oven. you observe that after 9 minutes, the cookies on one sheet are slightly burned on the bottom, whereas those on the other sheet are fine. (you are curious and you vary the conditions so you know the result is not caused by the oven.) (a) how can you use this observation to infer something about the specific heat of the materials in the baking sheets? (b) what is the mathematical reasoning (equation) that you need to support your conclusion?Chemists 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?(i) Explain the term combinatorial chemistry, and discuss its significance for the drug discovery. (ii) Describe the main techniques used for combinatorial chemistry.2. An experiment was carried out to determine the enthalpy change of combustion of propan-1-ol. The experimental set-up was shown below. a beaker water (500.0 cm³) propan-1-ol (a) Write the equation for the complete combustion of propan-1-ol (C;H¬OH). (b) Give a suggestion to the above set-up so as to minimize heat loss to the surroundings. (c) Burning 2.88 g of propan-1-ol caused the temperature of 500.0 cm³ of water to rise by 46.0°C. Calculate the enthalpy change of combustion of propan-1-ol. (Assume that the specific heat capacity and the density of water are 4.2 J g- K-l and 1.0 g cm- respectively.) (Molar mass of propan-1-ol: 60 g) -3 (d) The enthalpy change obtained in (c) cannot be called as 'standard enthalpy change'. Explain why.
- (A) from the choices if both sentences are true (B) if both sentences are false (C) if the first sentence is true but the second is false (D) if the first sentence is false but the second is true.The bombardier beetle uses an explosive discharge as a defensive measure. The chemical reaction involved is the oxidation of hydroquinone by hydrogen peroxide to produce quinone and water: CоHа (ОН)2 (ад) + H202(аg) — СөН, О2(ад) + 2H2О() Calculate AH for this reaction from the following data: CвНа (ОН)2(аq) — СеH4О2(ад) + H2(9) ДН — 177.4 kJ H2 (g) + O2 (g) → H2O2(ag) AH = -191.2 kJ H2 (g) + 02 (g) → H2O(g) AH = -241.8 kJ H2O(g) → H20(1) AH = -43.8 kJ ΔΗ kJTo further investigate the reactivity of silver, the student submerges a piece of metallic scandium, Sc (s), in a solution of AgNO3 (aq) and observes that the following reaction occurs. Sc(s) + 3 AGNO3 (ag) →3 Ag(s) + Sc(NO3); (aq) (k) Write the balanced net-ionic equation for the reaction. B IU x² X, 3 Ĉ Ω 0/10000 Word Limit