For students all specialities

INDIVIDUAL WORK-13

For students all specialities

MODUL 2

	In a subgroup of alkaline metals cesium has smallest electronegativity, as it has:
a	Valent electrons comparetively most remote from nucleus
b	Greatest number of valent electrons compared with other elements
c	Greatest atomic mass
d	Greatest number of neutrons in the nucleus

	From 9 g of hydroxide of metal at decomposition formed 7,2 g of an oxide of twovalent metal. This metal is:
a	Magnesium
b	Copper
c	Nickel
d	Iron
f	Cobalt

	In which of the given series of elements the electron affinity grows from left to right:
a	Sі – P – S – Cl
b	Lі – Na – К – Rb
c	S – Se –Te – Po
d	О – N – С – В

	What is density of hydrogen bromide relative to hydrogen and relative to air
a	50; 2,0
b	40,5; 2,8
c	20,2; 1,4
d	36,2; 2,4
f	2,8; 40,5

	What is the ratio between values of coefficients m and n the equation of reaction Fe m (SO4) n + mn NaOH = m Fe(OH)n+ n Na2SO4
a	n = m + 2
b	n = 2 m
c	m = n
d	n = m + 1

	Molar mass hydroxide of iron (ІІІ) makes:
a	92 g/mole
b	107 g/mole
c	73 g/mole
d	75 g/mole
f	104 g/mole

	The covalent bond is characterized:
a	Directionality in space and length
b	Bond order, saturability, directionalіty in space, length, energy and polarity
c	Bond order and saturability
d	Bond order, unsaturability, nondirectionalіty in space, length, energy and polarity
f	Energy and polarity

	Find the charge of complex ion, charge, covalency and coordination number of the central atom in the complex compound [Cr(H2O)5Br]3(PO4)2, and also sum of coefficients in the equation of reaction of exchange of this salt solution with a solution of sulfuric acid:
a	2+, 3+, 6, 6, 9
b	3+, 2+, 6, 6, 9
c	3+, 3+, 6, 6, 9
d	2+, 3+, 5, 5, 9
f	2+, 3+, 5, 6, 7

	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/

	Value for the reaction H2(g)+ Br2(g) = 2HBr(g), if react= –72,48 kJ/mol; react = 21,04 J/mol×К, is equal to:
a	–78,75 kJ/mol
b	–76,75 kJ/mol
c	–77,75 kJ/mol
d	–75,75 kJ/mol
f	–79,75 kJ/mol

	At chlorination of methane is formed CCl4. In what ratio was taken methane and chlorine for this reaction, if the initial concentration of methane was 0,4 mol/l, and after its complete reaction concentration of chlorine made 3,2 mol/l:
a	1: 2
b	1: 16
c	1: 4
d	1: 10
f	1: 8

	At certain temperature equilibrium of homogeneous reaction 2Н2S(g)+ 3O2(g)= 2Н2O(g)+ 2SO2(g) was established at the following concentrations of substances: [H2S] = 0,2 mol/l; [O2] = 0,6mol/l; [H2O] = 0,4 mol/l; [SO2] = 0,4 mol/l. Find the equilibrium constant of this chemical reaction:
a	Кр= 1,16
b	Кр= 2,96
c	Кр= 6,22
d	Кр= 3,14
f	Кр= 4,38

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