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INDIVIDUAL WORK-9

For students all specialities

MODUL 2

	Among the given electronic formulas of an element to the smallest atomic radius corresponds:
a	1 s ^22 s ^22 p ^63 s ^23 p ^5
b	1 s ^22 s ^22 p ^63 s ^1
c	1 s ^22 s ^22 p ^63 s ^23 p ^3
d	1 s ^22 s ^22 p ^63 s ^2
f	1 s ^22 s ^22 p ^63 s ^23 p ^1

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

	Among the given pairs of elements most similar chemical properties have:
a	Silicon, phosphorus
b	Calcium, silicon
c	Phosphorus, arsenic
d	Silver, nickel
	Among the given statements concerning radiuses of cations of sodium, magnesium and aluminium correct is:
a	Radius of cation of sodium is smallest, and of cation of aluminium — greatest
b	Radiuses of cations are approximately identical
c	Radiuses of cations are identical
d	Radius of cation of sodium is greatest, and cation of aluminium — smallest

	Mass 3,01·10^23 molecules of hydroxide of an element of the II group of periodic system are equal 29 g. This element is:
a	Magnesium
b	Radon
c	Calcium
d	Beryllium
f	Barium

	On a basis of what laws has been made a sequence of elements: sodium, potassium, rubidium, cesium:
a	Elements of the main subgroup
b	Elements of collateral subgroup
c	Met in nature in free state
d	In the compounds these elements show constant valency

	Polarization of bonds in a series of the same molecules depends on:
a	Electronic orbital density
b	Electronegativity of atoms, which take part in formation of bonds
c	Length of bonds
d	Of radiuses of atoms, which take part in formation of bonds

	Find charge of complex ion, charge and coordination number of the central atom in the coordination compound [Cr(NH3)6]РО4, and also sum of coefficients in the reaction of exchange of this salt solution with a solution of sulfuric acid:
a	2+, 2+, 6, 6
b	3+, 4+, 6, 8
c	3+, 3+, 6, 8
d	3+, 3+, 4, 9
f	2+, 2+, 6, 4

	Which of the given formulas expresses value of constant of instability of the complex [Pt(NH3)4Cl2]Cl2 at complete dissociation of its complex ion:
a	Кinst=
b	Кinst=
c	Кinst=
d	Кinst=
f	Кн=

	Value for the reaction C3H8(g)+ 5O2 = 3CO2(g)+ 4Н2O(g), if react= –2044 kJ/mol; react= 100,8 J/mol×К, is equal to:
a	–1974,04 kJ/mol
b	–2274,04 kJ/mol
c	–2074,04 kJ/mol
d	–2174,04 kJ/mol
f	–1874,04 kJ/mol

	How much is necessary to reduce concentration of oxygen, that at increase of sulfur (IV) oxide concentration in 3 times the rate of formation of sulfuric anhydride has remained constant:
a	In 9 times
b	In 36 times
c	In 24 times
d	In 3 times
f	In 6 times

	The equilibrium constant of reversible reaction СO2+ Н2= СО + Н2О at certain temperature is equal 1. In what volumetric ratio it is required to mix carbon dioxide and hydrogen, so that to the moment of equilibrium establishment will react 60 % of hydrogen:
a	0,2: 1
b	1,2: 1
c	3,6: 1
d	1,5: 1
f	0,4: 1

Дата добавления: 2015-11-05