For students all specialities

INDIVIDUAL WORK-14

For students all specialities

MODUL 2

	The number of elements in the period is determined by:
a	Valency of elements
b	Number of filled up atomic orbitals
c	Orbital quantum number
d	Number of energy levels
f	Structure of an external quantum level

	Among the given elements the greatest value of energy of an electron affinity has:
a	Carbon
b	Aluminium
c	Sulfur
d	Oxygen
f	Fluorine

	Among the given elements electron jump up is most characteristic for:
a	Chromium
b	Calcium
c	Plumbum
d	Copper
f	Scandium

	Among the given ions a similar to ion Na^+ electronic shell is:
a	Ca2+
b	Mg2+
c	H^+
d	K^+
f	Li^+

	Bromine has larger oxidizing properties, than iodine, because:
a	Radius of atom of bromine is greater, than radius of atom of an iodine
b	Oxidizing properties of iodine is greater, than oxidizing properties of bromine
c	Radius of atom of iodine is greater, than radius of atom of bromine
d	Electron affinity of atom of bromine is greater, than electron affinity of atom of iodine
f	Electron affinity of atom of iodine is greater, than electron affinity of atom of bromine

	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

	Molecular orbitals are bonding if:
a	Density of electronic clouds of atoms, which form a molecule, are more then density of an electronic cloud of molecular wave function
b	Density of an electronic cloud in internuclear space is increased
c	Density of an electronic cloud in internuclear space decreases
d	Density of an electronic cloud in internuclear space does not change
	Find the charge of a complex ion, charge, covalency and coordination number of the central atom in a hexaammine chromium (ІІІ) chloride, and also sum of coefficients in the equation of reaction of exchange of this salt solution with silver nitrate solution:
a	2+, 2+, 6, 6, 7
b	3+, 3+, 6, 6, 4
c	2+, 2+, 6, 6, 8
d	3+, 3+, 6, 6, 8
f	3+, 3+, 5, 5, 8

	Find concentration of molecules NH3 which are formed 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 the complex ion [Co(NH3)6]^3+ at its dissociation practically does not change:
a	mol/l
b	mol/l
c	0,01 mol/l
d	mol/l
f	4×10^–5×0,01 mol/l

	Value for the reaction H2(g)+ I2(g) = 2HI(g), if react= –114,12 kJ/mol; react= 21,54 J/mol×К, is equal to:
a	–115,09 kJ/mol
b	–120,54 kJ/mol
c	–118,29 kJ/mol
d	–116,33 kJ/mol
f	–113,75 kJ/mol

	A reaction runs according the equation А2 + В2 = 2АВ. The initial concentration of substance A is equal 0,8 mol/l, and substance B is 1mol/l. After some time the concentration of substance A has been decreased down to 0,5 mol/l. Find thus the concentration of substance В:
a	0,75 mol/l
b	0,3 mol/l
c	0,5 mol/l
d	0,2 mol/l
f	0,7 mol/l

	The equilibrium constant of homogeneous reaction 2Н2S + 3O2=2Н2O + 2SO2 is equal 1. The equilibrium concentrations were: [H2S] =2 mol/l; [O2] = 4 mol/l; [H2O] = 4 mol/l. Find the equilibrium concentration of sulfur oxide:
a	2 mol/l
b	6 mol/l
c	4 mol/l
d	3 mol/l
f	5 mol/l

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