Solution of the variant 02 KR №1 - chemisty Shimanovich

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The solution of the control work No. 1 of variant 00 of the collection on chemistry Shimanovich I.E.

Tasks:

2. In what mass of NaOH does it contain as many equivalents as in 140 g of KOH?

22. Write electronic formulas of atoms of elements with ordinal numbers 16 and 26. Distribute the electrons of these atoms in quantum cells. To which electronic family does each of these elements belong?

42. What is the ionization energy? In what units is it expressed? How does the restorative activity of the s and p elements in the groups of the periodic system change with increasing ordinal number? Why?

62. What kind of covalent bond is called polar? What is the quantitative measure of the polarity of the covalent bond? Proceeding from the electronegativity values ​​of the atoms of the corresponding elements? Determine which of the links: HI, ICI, BrF - the most polar.

82. Gaseous ethyl alcohol C2H5OH can be obtained by the interaction of ethylene C2H4 (g) and water vapor. Write the thermochemical equation of this reaction, calculating its thermal effect.

102. At what temperature will the system come to equilibrium?
4HCl (r) + O2 (d) 2H2O (d) + 2C12 (g); H = -114.42 kJ?
Chlorine or oxygen in this system is a stronger oxidizer and at what temperatures?

122. Write an expression for the equilibrium constant of the homogeneous system N2 + 3H2 2NH3. How will the rate of direct reaction-the formation of ammonia-change if the hydrogen concentration is increased three-fold?

142. What is the normality of a 30% NaOH solution with a density of 1.328 g / cm3? To 1 liter of this solution, 5 liters of water was added. Calculate the percentage concentration of the solution obtained.

162. Calculate the percentage concentration of the aqueous solution of sugar C12H22O11, knowing that the crystallization temperature of the solution is -0.93 ° C. The cryoscopic constant of water is 1.86 °.

182. Make molecular and ion-molecular equations of interaction reactions in solutions between:
(A) K2S and HCl;
B) FeSO4 and (NH4) 2S;
C) Cr (OH) 3 and KOH

202. The following substances were added to the solution of FeCl3:
A) HCl;
B) KOH;
C) ZnCl2;
D) Na2CO3.
In what cases will the hydrolysis of ferric chloride increase? Why? Make ion-molecular equations for the hydrolysis of the corresponding salts.

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