FEFU WEBDidactor Legal studies - 2 questions #507
FEFU Legal studies Pavlenko Natal_a Eduardovna Computer Exam - Legal studies - Zacteno 1. Gosudarstvennaa slujba: ponatie, poradok ee prohojdenia. 2...
74. Solving a chemistry problem
D.17. In chemical analysis, the precipitation of zinc ions Zn2 by the action of hydrosulfide acid H2S is carried out in the presence of sodium...
74. Solving a chemistry problem
E.6. Calculate the equilibrium potential of an iron electrode immersed in a solution containing 0.0699 g of iron (2) chloride FeCl2 in 500 ml of...
74. Solving a chemistry problem
E.14. During the electrolysis of a melt of natural calcium chloride, 7 kg of calcium Ca at a current output of 75%. Calculate the mass of calcium...
74. Solving a chemistry problem
G.2. Explain in which group of the Periodic system of chemical elements of D. I. Mendeleev (main or secondary) and in what periods all f-elements...
74. Solving a chemistry problem
G.15. When the nucleus of the nitrogen isotope 147N is irradiated with neutrons, an intermediate nucleus is formed, which emits a deuteron (21H)...
74. Solving a chemistry problem
Z.4. Calculate the covalent bond energy in the HCl molecule if the standard enthalpy of formation of this substance is 92.3 kJ/mol, and the bond...
74. Solving a chemistry problem
I.20. The instability constant of the [CdI4]2− ion is 7.94•10−7. Calculate the concentration of cadmium ions Cd2 in a 0.1 M solution of the complex...
74. Solving a chemistry problem
1. What is photometric titration based on? What chemical reactions are used in photometric titrations and what are the requirements for them? What...
74. Solving a chemistry problem
2. Describe the fluorimetric method for the determination of sulfide ions.
74. Solving a chemistry problem
3. What classes and groups of electrodes are used in potentiometry? What reference electrodes are most commonly used in potentiometry? Give the...
54. Solving a chemistry problem
3. Diffusion coefficient D of dodecyl ammonium chloride micelles was determined: CNaCl, M 0 1.016 0.046 D*1010, m2/s 1.321 1.115 0.967 Determine the...
45. Solving a chemistry problem
185. Decomposition of a 0.025 M solution of oxalic acid in 99.5% (mass.) sulfuric acid gave the following results: t, min 120 240 420 600...
35. Solving a chemistry problem
52. Kinetic and thermodynamic sedimentation stability of the system. Determination of particle sizes under conditions of diffusion-sedimentation...
25. Solving a chemistry problem
214. Carry out transformations: propane → propene → 2-propanol → propanone → → formic acid acetic acid → acetic ethyl ester → CO2 H2O.
15. Solving a chemistry problem
36. Determine the possibility of a spontaneous passage of a chemical reaction, calculate the change in the values of ΔH0298, ΔS0298 of the reaction...
4. Solving a chemistry problem
3. When analyzing dolomite, a precipitate of Mg2P2O7 was obtained, weighing 0.3251 g. What mass of a) Mg, b) MgO c) MgCO3 corresponds to this...