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INDIVIDUAL WORK-2

For students all specialities

MODUL 2

	In the maximal possible exited state the total spin of an atom makes 3. Find the number of the group, in which located this atom:
a	2
b
c
d
f

	Among the given electronic configurations the smallest value of energy of ionization corresponds to:
a	1 s ^22 s ^22 p ^3
b	1 s ^22 s ^22 p ^63 s ^2
c	1 s ^22 s ^22 p ^6
d	1 s ^22 s ^22 p ^63 s ^1

	The reason of periodic change of properties of elements is:
a	Increase of a charge of a nucleus of atom
b	Increase of radius of atoms in groups
c	Periodic repetition of similar electronic structures
d	Increase of number of electrons in atoms
	At interaction of 1,5 g of an oxide of alkaline metal with water was formed 1,65 g of an alkaline. This metal is:
a	Lithium
b	Potassium
c	Sodium
d	Cesium
f	Rubidium

	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
	At the decomposition of 25 g of a carbonate of twovalent metal was liberated 5,6 l carbon dioxide under normal conditions. The formula of the salt looks like:
a	SrCO3
b	CaCO3
c	MgCO3
d	BeCO3
f	BaCO3

	Find covalence and oxidation state of sulphur in a molecule Н2S:
a	3, +2
b	6, +2
c	4, –2
d	6, –2
f	2, –2

	Find charge of the complex ione, charge and coordination number of the central atom in complex compound K4[Fe(CN)6]:
a	4–, 2+, 4
b	2–, 6+, 4
c	3–, 3+, 3
d	4–, 2+, 6
f	2–, 3+, 6

	Find concentration of complex ion [Co(NH3)5]^3+, that forms according the first step of dissociation (first instability constant is К1 = 4×10^–5) in 0,01 M solution of hexaamminecobalt (ІІІ) chloride, if concentration of complex ion [Co(NH3)6]^3+ at its dissociation practically does not change:
a	mol/
b	4×10^–5×0,01 mol/
c	0,01 mol/
d	mol/
f	mol/

	Thermochemical equations of formation of nitrogen and carbon oxides look like: 1/2N2(g)+ 1/2O2(g)= NO(g), DНо = 90,25 kJ; С(crist)+ 1/2O2(g)= СО(g), DНо = –110,5 kJ. It means, that in this reactions:
a	200,75 kJ of heat is liberated
b	90,25 kJ is absorbed and 110,5 kJ of heat is absorbed
c	90,25 kJ is absorbed and 110,5 kJ of heat is liberated
d	200,75 kJ of heat is absorbed
f	90,25 kJ is liberated and 110,5 kJ of heat is absorbed

	The rate constant of chemical reaction 2SO2+ O2= 2SO3 is 1,6. Initial concentrations of oxygen and oxide of sulfur are 0,16 mol/l and 1,2 mol/l accordingly. After some time the concentration of oxygen has decreased down to 0,06 mol/l. Find thus the concentration of sulfur (IV) oxide and the reaction rate:
a	С(SО2) = 1,0 mol/l; 9,6×10–2mol/l×s
b	С(SО2) = 0,12 mol/l; 1,76×10–5mol/l×s
c	С(SО2) = 1,1 mol/l; 3,46×10–3mol/l×s
d	С(SО2) = 1,14 mol/l; 2,56×10–3mol/l×s
f	С(SО2) = 0,08 mol/l; 9,84×10–4mol/l×s

	Equilibrium of reaction H2+ Cl2= 2НСl(g) was established at the following concentrations of substances: [Н2] = 0,25 mol/l; [Cl2] = 0,05 mol/l; [НСl] = 0,9 mol/l. Find the initial concentration of chlorine:
a	0,7 mol/l
b	0,5 mol/l
c	0,8 mol/l
d	0,2 mol/l
f	0,6 mol/l

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