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- If concentration of [CrO4 ] in Expt. 7 is found to be 6.7 x 105 M, what is the experimental Ksp of Ag,CrO4? a) 3.0 x 1013 b) 6.0 x 1013 c) 1.2 x 1012 d) 1.8 x 108 Ksp of Ag.CrO4 = [Ag]° [CrO,?] Ag,CrO4 2 Ag+(aq) + CrO,-(aq), moles, and concentration, of Ag+ are twice those of Cro Ksp of Ag.CrO, = [Ag"] [CrO,] = [2Cro.1°[CrO,] = [CrO.,*]Manganese silicide has the empirical formula MnSi andmelts at 1280 °C. It is insoluble in water but does dissolvein aqueous HF. (a) What type of compound do you expectMnSi to be: metallic, molecular, covalent-network, orionic? (b) Write a likely balanced chemical equation for thereaction of MnSi with concentrated aqueous HF.Which of the following would serve as the best reducing agent for Fe2" (aq) to produce iron solid? Give: E° Fe2"/Fe=-0.44 V, Ni2'/Ni=-0.23 v, Cr³"/Cr=-0.73 V A. Ni²+ B. Ni С. Cr D. Cr3+
- Iron corrodes to produce rust, Fe2O3, but other corrosionproducts that can form are Fe(O)(OH), iron oxyhydroxide,and magnetite, Fe3O4. (a) What is the oxidation numberof Fe in iron oxyhydroxide, assuming oxygen’s oxidationnumber is -2? (b) The oxidation number for Fe in magnetitewas controversial for a long time. If we assume thatoxygen’s oxidation number is - 2, and Fe has a uniqueoxidation number, what is the oxidation number for Fein magnetite? (c) It turns out that there are two differentkinds of Fe in magnetite that have different oxidationnumbers. Suggest what these oxidation numbers are andwhat their relative stoichiometry must be, assuming oxygen’soxidation number is -2.The reaction Cr(NH3)63*(aq) + 3en(aq) --> Cr(en)33+ (aq) + 6 NH3(aq)where en represents ethylenediamine, is endothermic. What can possibly be true for the spontaneity of the reaction. the reaction is spontaneous for all temperatures. the reaction is spontaneous for low temperatures. the reaction is non-spontaneous for all temperatures. the reaction is spontaneous for high temperatures. not enough info to tell.Consider the photochemical isomerization A= B. At 650. nm, the quantum yields for the forward and reverse reactions are 0.83 and 0.52, respectively. If the molar absorptivities at 650. nm of A andB are 1.2×103 L·mol-1.cm¬1 and 4.5x102 L·mol-1.cm-1, respectively, what is the ratio [B]/[A] in the photostationary state? [B] = 4.0 [A] Supporting Materials Periodic Table E Constants and I Supplemental Data Factors
- a) : Draw Iron Iron-Carbide diagram and explain its each phase reactions. (b) : Define the following structures. (i) Ferrite (ii) Austenite (iii) Cementite(i) Name the method used for the refining of titanium. (ii) What is the role of Zn in the extraction of silver? (iii) Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?The formation constants at 25°C for Fe(CN)64– and Fe(EDTA)2– are 1.00x1037 and 2.10x1014, respectively. Calculate K under standard conditions for the reaction. Calculate ΔG° for the reaction.