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INDIVIDUAL WORK-15

For students all specialities

MODUL 2

	Among the given elements has smallest electronegativity:
a	Cesium
b	Fluorine
c	Silicon
d	Sodium
f	Iodine

	0,49 g of hydroxide of twovalent metal reacted with sulfuric acid, as a result was formed 0,8 g of salt. Formula of the hydroxide is:
a	Co(OH)2
b	Mg(OH)2
c	Cu(OH)2
d	Fe(OH)2
f	Ca(OH)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

	How many valent electrons has an element if its electronic structure looks like 1 s 22 s 22 p 63 s 23 p 4:
a
b
c
d
f

	In a highest oxide of an element a ratio between atoms of oxygen and the element makes 1:1. How many valent р -orbitals are filled with electrons in the atom of this element:
a
b
c
d

	On a basis of what laws has been made a sequence of elements: carbon, nitrogen, oxygen, fluorine:
a	The elements are located in ascending order of atomic mass
b	Elements of one group
c	All belong to metals
d	All belong to nonmetals
f	Elements of one period

	From the given compounds the formation of hydrogen bonds is possible for:
a	Н2О
b	СН3ОН
c	CF4
d	НІ
f	HCl
	Find the charge of complex ion, charge, covalency and coordination number of the central atom in potassium tetrahydroxozincate:
a	2–, 2+, 2, 2
b	2+, 2+, 4, 4
c	2–, 2+, 2, 4
d	2–, 2+, 4, 2
f	2–, 2+, 4, 4

	Concentration of ions Cl^– in 0,01 M solution of the complex compound [Co(NH3)4Cl2]Cl3 (first instability constant is К1 = 4×10^–5) is:
a	mol/l
b	mol/l
c	mol/l
d	0,03 mol/l
f	0,01 mol/l

	Enthalpy of methane formation, found by using of the following thermochemical equations Н2(g)+1/2О2(g) = Н2О(liq); DН = –285,84 kJ С(solid) + О2(g)= СО2(g); DН = –393,51 kJ СН4(g) + 2О2(g) = 2Н2О(liq) + СО2(g); DН = –890,31 kJ, is equal to:
a	–213,5 kJ
b	+159,76 kJ
c	–679,35 kJ
d	–74,88 kJ
f	+56,95 kJ

	For realization of reaction have taken a certain quantity of substances. The reaction ran during 30 minutes, and the measurement of its rate was carried out every 5 minutes. How will be changed the reaction rate during its course:
a	Will pass through a maximum
b	Decrease
c	Will pass through a minimum
d	Will not change
f	Will increase

	In a closed vessel runs homogeneous reaction 2CO + O2 = 2CO2. The initial concentrations of reactants were equal c(CO) = 0,5 mol/l, c(O2) = 0,2 mol/l. Find equilibrium constant of reaction and equilibrium concentrations of all components, if at some temperature in the reaction had entered 20 % of carbon (ІІ) oxide:
a	Кр= 0,416, [CO] = 0,4 mol/l, [O2] = 0,15 mol/l, [CO2] = 0,1 mol/l
b	Кр= 0,516, [CO] = 0,5 mol/l, [O2] = 0,3 mol/l, [2CO2] = 0,2 mol/l
c	Кр= 0,616, [CO] = 0,6 mol/l, [O2] = 0,4 mol/l, [2CO2] = 0,3 mol/l
d	Кр= 0,316, [CO] = 0,3 mol/l, [O2] = 0,2 mol/l, [2CO2] = 0,15 mol/l
f	Кр= 0,208, [CO] = 0,2 mol/l, [O2] = 0,075 mol/l, [2CO2] = 0,05 mol/l

Дата добавления: 2015-11-05