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INDIVIDUAL WORK-12

For students all specialities

MODUL 2

	The internal periodicity of properties of p-elements is explained by features of filling p -orbitals with electrons according to the rule of:
a	Hund
b	Vant Hoff
c	Klechkovsky
d	Le Chatelier
f	Pauli

	Among the given elements a greatest radius of atom has:
a	Scandium
b	Chromium
c	Nickel
d	Vanadium
f	Manganese

	What from the given states of valent electrons in the atom of tin has largest energy:
a	3 d 34 s 2
b	4 d 25 s 2
c	5 s 1 5р 2
d	5 s 1 5р 3
f	5 s 2 5р 2

	How many atoms of hydrogen are contained in 112 l of acetylene С2Н2:
a	5×1023
b	12×1024
c	6×1024
d	9×1024
f	1×1024

	What is the ratio of numbers of atoms of oxygen and carbon in a compound, in which the mass part of carbon is equal 27,27%, and oxygen — 72,73%:
a	8: 3
b	2: 1
c	1: 1
d	5: 2
f	32: 9

	Molar mass of equivalent of nitric acid in reaction Al + HNO3 ® Al(NO3)3+ NH4NO3+ … is equal:
a	7,9 g/mole
b	10,5 g/mole
c	13,2 g/mole
d	21 g/mole
f	64 g/mole

	On the basis of given relative electronegativity of elements determine, what from the given chemical bonds is characterized by the smallest part of ionic bond:
a	K – Cl
b	Si – Cl
c	In – Cl
d	Al – Cl
f	Ca – Cl

	Find the charge of a complex ion, charge, coordination number and covalency of the central atom in potassium hexacyanoferrate (ІІІ), and also sum of coefficients in the equation of reaction of exchange of this salt solution with silver nitrate solution:
a	3–, 3+, 4, 4, 6
b	2–, 2+, 6, 6, 8
c	3–, 3+, 6, 6, 4
d	3–, 3+, 6, 6, 8
f	2–, 2+, 4, 4, 8

	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

	Value for the reaction H2(g)+ Cl2(g) = 2HCl(g), if react= –184,62 kJ/mol; react= 19,82 J/mol×К, is equal to:
a	–190,53 kJ/mol
b	–170,53 kJ/mol
c	–200,53 kJ/mol
d	–160,53 kJ/mol
f	–180,53 kJ/mol

	Temperature coefficient is equal 3. How will decrease reaction rate if to reduce temperature of reaction mix from 140°C to 120°C:
a	In 40 times
b	In 64 times
c	In 9 times
d	In 12 times
f	In 81 times

	At temperature 508°C the equilibrium constant of reversible reaction 2НI = Н2+ I2 is equal 0,0294. What part of hydrogen iodide had been dissociated to the moment of equilibrium establishment:
a	25,4%
b	6,7%
c	20,4%
d	13,4%
f	15,8%

Дата добавления: 2015-11-05