For students all specialities

INDIVIDUAL WORK-11

For students all specialities

MODUL 2

	What from the given elements has the greatest value of the energy of ionization:
a	Gallium
b	Bromine
c	Plumbum
d	Strontium
f	Germanium

	With increase of serial number effective radiuses of atoms of d-elements of the V and VI periods:
a	Practically do not change
b	At first are increased, and then decrease
c	At first decrease, and are then increased
d	Decrease
f	Are increased

	For which of given elements the value of ionization energy is smallest:
a	Neon
b	Oxygen
c	Nitrogen
d	Carbon
f	Fluorine
	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
	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

	A number of neutrons in a nucleus of atom of any element is equal to:
a	Difference between a serial number and number of the period
b	Relative atomic mass
c	Number of the period
d	Serial number
f	Difference between relative atomic mass and serial number

	On the basis of values of relative electronegativity of elements determine, what from the given chemical bonds is characterized by the greatest part of ionic bond:
a	O – Na
b	O – Al
c	O – Ca
d	O – K
f	O – H

	Find the charge of complex ion, charge, coordination number and covalency of the central atom in sodium hexacyanocobaltat (ІІІ), and also the sum of coefficients in the equation of reaction of exchange of this salt solution with a solution of iron (ІІ) sulfate:
a	3–, 3+, 4, 4, 5
b	3–, 3+, 6, 6, 7
c	2–, 2+, 4, 4, 6
d	2–, 2+, 6, 6, 4
f	3–, 3+, 6, 6, 9

	Find concentration of molecules NH3 which are formed according the first step of dissociation (first instability constant is К1 = 1×10^–5) in 0,01 M solution of tetramminecopper (ІІ) chloride, if concentration of the complex ion [Cu(NH3)3]^2+ at its dissociation practically does not change:
a	3,2×10^–4 mol/l
b	5×10^–5 mol/l
c	0,32 mol/l
d	0,01 mol/l
f	0,03 mol/l

	Value for the reaction H2(g)+ F2(g) = 2HF(g), if react= –537,2 kJ/mol; react=13,05 J/mol×К, is equal to:
a	–538,089 kJ/mol
b	–540,089 kJ/mol
c	–541,089 kJ/mol
d	–539,089 kJ/mol
f	–537,089 kJ/mol

	At increase of temperature on 50°C reaction rate had grown in 1024 times. Find temperature coefficient of this reaction:
a
b	3,5
c	2,5
d
f

	At certain temperature the equilibrium constant of reversible reaction 2АВ(g)= А2(g)+ В2(g) makes 0,02. Find the percentage extent of thermal dissociation of substance АВ at this temperature:
a	86%
b	63%
c	22%
d	74%
f	49%

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