Chemistry

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1. To set forth in Table 2 elements compose electronic and electronic-graphic formulas. Specify the valence electrons and the degree of oxidation. Write formula possible compounds of these elements with oxygen and hydrogen. Specify the nature of the oxide reaction equations prove their most important chemical properties and draw their graphic formulas.

Elements number Explain
13 Mn, Cl why these elements are in different periods, in the same group, but in different subgroups?


2. Identify the type of chemical bonds in the molecules listed in Table 3. Draw the scheme of the valence orbitals overlap in the formation of covalent bonds in isolated molecules. (If necessary, use a table of 15 - 19).

Number Connections Explain
33 NCl3, MgCl2 what SP - hybridization. Select a molecule with the same type of hybridization.


3. On the basis of the standard enthalpies of formation and absolute standard entropy (Table 20) of the respective agents calculate the change in the Gibbs energy and equilibrium temperature indicated in Table 4 of the reaction, as well as the possibility of occurrence of this reaction in the forward direction under standard conditions.
Table 4
Number equation
53 2C2H6 (g) + 7O2 (g) = 6H2O (g) + 4CO2 (g)

Additional information

4. For all the tasks in Table 5 give a reasonable answer, but for the problems with the definition of the direction of displacement of equilibrium, write the expression of the equilibrium constant (Kp).
Table 5
Condition number assignment
The action 73 which factors can shift the equilibrium of the chemical reaction in N2 (g) + 6Li (t) 2Li3N (t) + 39 kJ / mol in the direction of the reaction products?

5.The basis of the structure of the atom, specify the role of the oxidant or reducing agent in OBP show selected elements in the compounds listed in Table 11. Arrange the coefficients by electron balance in the chart of reaction equations.
TABLE 11
Diagram number Connections IAD
193 SO2, K2CrO4 FeSO4 + KMnO4 + H2SO4¬ = Fe2 (SO4) 3 + MnSO4 + ..


6.Privedi¬te circuit device and of the electrochemical cell (GE). Give the equation of the current-producing reaction. Calculate the EMF element.
TABLE 13
Condition number assignment Calculate the EMF element.
233 on one of the electrodes flows pro¬tsess Sn + 2 + 2e → Sn0 concentration salt solution is 1 mol / l.



7. Apparatus of bronze (an alloy of Cu with Sn) operated under acidic conditions. Chart of work arising nakorotkozamknutogo electrochemical cell and electronic equation of anodic and cathodic processes. The introduction of iron in bronze lowers corrosion resistance of the latter. Give an explanation for this fact.


8. In what sequence will be allocated metal in the electrolysis solution containing the same concentration of sulphates of nickel, silver, copper? Justify your answer. Chart electrolysis of aqueous nickel sulfate solution, if the carbon anode. Write the equation for the electronic processes taking place in ka¬tode and the anode, and the total equation of the process of electrolysis.


9. For each substance, the data in your form, do the following:
- Specify the classes to which they belong
- Draw their full structural formulas and give them the names of the international systematic nomenclature
- Mark the existing ties in these compounds symbols σ and π
- Write the equation of typical reactions of these substances by their conditions, give the name of the reaction products
Select which of the substances of data in your embodiment, and is a monomer for which of the processes - polymerisation or polycondensation. Write circuit polymerization or polycondensation reaction of the substance. If necessary, it polycondensation pick yourself a second monomer. Choose the class of the obtained polymer and the possible directions of its use, including in your future industry. Allow definition: that is a polymer, a monomer, a polymerization reaction and polycondensation.
Table 15
Jobs Links
293 C4H8; n-C6H4 (COOH) 2

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