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INDIVIDUAL WORK-1

For students all specialities

MODUL 2

	Which of the given electronic configurations corresponds to an element of collateral subgroup of VI group of periodic system:
a	…4 f 145 d 46 s 2
b	…5 f 46 s 2
c	…4 f 145 d 106 s 26 p 4
d	…4 f 35 d 16 s 2
f	…5 d 36 s 1
	What of the compounds has greatest reductive properties:
a	Н2О
b	Н2Te
c	Н2S
d	Н2Se

	Internal periodicity of properties for long periods elements corresponds to the following features:
a	Weakening of metal properties in the middle of the period on a background of their general strengthening tendency
b	Strengthening metal properties at the end of the period on a background of their general weakening tendency
c	Weakening of metal properties at the beginning of the period on a background of their general strengthening tendency
d	Strengthening of metal properties at the beginning of the period on a background of their general weakening tendency
f	Strengthening of metal properties in the middle of the period on a background of their general weakening tendency

	Mass of 1l of an hydrogen compound of an element, which is in the seventh group of periodic system, under normal conditions is 1,63 l. This element is:
a	Bromine
b	Astatium
c	Fluorine
d	Iodine
f	Chlorine

	The element is in the IV group of periodic system, relative density of its hydrogen compound by air is equal 1,17. This element is:
a	Sulfur
b	Selenium
c	Polonium
d	Oxygen
f	Tellurium

	9 g of three-valent element reacted with hydrochloric acid, thus under normal conditions was liberated 11,2 l of hydrogen. This element is:
a	Scandium
b	Indium
c	Aluminium
d	Boron
f	Gallium

	Find covalence and oxidation state of nitrogen in a molecule НNO3:
a	5, +5
b	4, +3
c	5, +3
d	3, +5
f	4, +5

	Find charge of a complex ion, charge and coordination number of the central atom in the complex compound [Pt(NH3)4(NO2)Cl]Cl2:
a	2+, 2+, 4
b	2+, 4+, 2
c	2+, 4+, 6
d	4+, 2+, 5
f	1–, 3+, 3

	Find concentration of ions Br^– which are formed according the first step of dissociation (first instability constant is К1 = 4×10^–3) in 0,01 M solution of potassium tetrabromomercurate(ІІ), if concentration of the complex ion [HgBr4]^2– at its dissociation practically does not change:
a	mol/l
b	mol/l
c	4×10^–3×0,01 mol/l
d	mol/l
f	0,01 mol/l

	Thermochemical equation formation of water in a liquid state looks: Н2(g)+ 1/2О2(g)= Н2О(liq), = –285,8 kJ. Enthalpy of formation of water in a vapor state is = –241,8 kJ/mol. Find enthalpy of vaporization of 1 mole of water at temperature 25°С according process Н2О(liq)® Н2О(g)
a	44,0 kJ/mol
b	–285,8 kJ/mol
c	–527,6 kJ/mol
d	–44,0 kJ/mol
f	–241,8 kJ/mol

	Find the initial concentrations of ammonia and oxygen in the system 4NH3+ 5O2= 4NO + 6Н2О, if after some time after reaction beginning the concentrations of ammonia, oxygen and water has reached values 0,003 mol/l, 0,02 mol/l and 0,003 mol/l respectively:
a	С(NH3) = 0,001 mol/l, С(O2)= 0,007 mol/l,
b	С(NH3) = 0,001 mol/l, С(O2)= 0,0175 mol/l,
c	С(NH3) = 0,003 mol/l, С(O2)= 0,052 mol/l,
d	С(NH3) = 0,002 mol/l, С(O2)= 0,01 mol/l
f	С(NH3) = 0,005 mol/l, С(O2)= 0,0225 mol/l,

	The initial concentrations of reactants for reaction С2Н5ОН + СН3СООН = СН3СООС2Н5+ Н2О were 1 mole of СН3СООН and 1 mole of С2Н5ОН. Find the equilibrium constant of the reaction, if the equilibrium mix contains of a mole of СН3СООС2Н5 and of mole of Н2О:
a	4
b	0,8
c
d
f

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