Solution of the variant 79 KR №1 - chemisty Shimanovich
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Solution of test work No. 1 of option 79 of the collection of chemistry Shimanovich I.E.
(formatted in Microsoft Word)
Tasks:
4. From 1.3 g of metal hydroxide, 2.85 g of its sulfate is obtained. Calculate the equivalent mass of this metal. Answer: 9 g / mol.
22. Write the electronic formulas of the atoms of the elements with serial numbers 16 and 26. Distribute the electrons of these atoms in the quantum cells. Which electronic family does each of these elements belong to?
51. Which of the p-elements of the fifth group of the periodic system - phosphorus or antimony - has more pronounced non-metallic properties? Which of the hydrogen compounds of these elements is the strongest reducing agent? Motivate your answer with the atomic structure of these elements.
63. What method of covalent bond formation is called donor-acceptor? What are the chemical bonds in the NN + 4 and BF-4 ions? Indicate donor and acceptor.
99. The combustion of 1 liter of acetylene (NU) releases 56.053 kJ of heat. Write down the thermochemical equation for the reaction that produces water vapor and carbon dioxide. Calculate the heat of formation of C2H2 (g). Answer: 226.75 kJ / mol.
104. The reaction of combustion of acetylene goes according to the equation:
C2H2 (g) + 5/202 (g) = 2CO2 (g) + H2O (g)
Calculate Go298 and So298. Explain the decrease in entropy as a result of this reaction.
Answer: -1235.15 kJ; -216.15 J / (mol * K).
129. In the homogeneous system A + 2B C, the equilibrium concentrations of reacting gases: [A] = 0.06 mol / l; [B] = 0.12 mol / L; [C] = 0.216 mol / l. Calculate the equilibrium constant of the system and the initial concentrations of substances A and B. Answer: K = 2.5; [A] ref = 0.276 mol / l; [B] ref = 0.552 mol / l.
146. How much and what substance will remain in excess, if to 75 cm 0.3 N. solution of H2SO4 add 125 cm3 0.2 N. solution of KOH? Answer: 0.14 g KOH.
167. Calculate the boiling point of a 5% solution of C10H8 naphthalene in benzene. The boiling point of benzene is 80.2 ° C. The ebullioscopic constant is 2.57 °. Answer: 81.25 ° C.
189. Which of the substances: KHCO3, CH3COOH, NiSO4, Na2S - interacts with a sulfuric acid solution? Write down the molecular and ion-molecular equations of these reactions.
219. Which of the salts K2CO3, FeCl3, K2SO4, ZnCl2 undergo hydrolysis? Draw up the ionic-molecular and molecular equations for the hydrolysis of the corresponding salts. What is the pH value (> 7 <) have solutions of these salts?
(formatted in Microsoft Word)
Tasks:
4. From 1.3 g of metal hydroxide, 2.85 g of its sulfate is obtained. Calculate the equivalent mass of this metal. Answer: 9 g / mol.
22. Write the electronic formulas of the atoms of the elements with serial numbers 16 and 26. Distribute the electrons of these atoms in the quantum cells. Which electronic family does each of these elements belong to?
51. Which of the p-elements of the fifth group of the periodic system - phosphorus or antimony - has more pronounced non-metallic properties? Which of the hydrogen compounds of these elements is the strongest reducing agent? Motivate your answer with the atomic structure of these elements.
63. What method of covalent bond formation is called donor-acceptor? What are the chemical bonds in the NN + 4 and BF-4 ions? Indicate donor and acceptor.
99. The combustion of 1 liter of acetylene (NU) releases 56.053 kJ of heat. Write down the thermochemical equation for the reaction that produces water vapor and carbon dioxide. Calculate the heat of formation of C2H2 (g). Answer: 226.75 kJ / mol.
104. The reaction of combustion of acetylene goes according to the equation:
C2H2 (g) + 5/202 (g) = 2CO2 (g) + H2O (g)
Calculate Go298 and So298. Explain the decrease in entropy as a result of this reaction.
Answer: -1235.15 kJ; -216.15 J / (mol * K).
129. In the homogeneous system A + 2B C, the equilibrium concentrations of reacting gases: [A] = 0.06 mol / l; [B] = 0.12 mol / L; [C] = 0.216 mol / l. Calculate the equilibrium constant of the system and the initial concentrations of substances A and B. Answer: K = 2.5; [A] ref = 0.276 mol / l; [B] ref = 0.552 mol / l.
146. How much and what substance will remain in excess, if to 75 cm 0.3 N. solution of H2SO4 add 125 cm3 0.2 N. solution of KOH? Answer: 0.14 g KOH.
167. Calculate the boiling point of a 5% solution of C10H8 naphthalene in benzene. The boiling point of benzene is 80.2 ° C. The ebullioscopic constant is 2.57 °. Answer: 81.25 ° C.
189. Which of the substances: KHCO3, CH3COOH, NiSO4, Na2S - interacts with a sulfuric acid solution? Write down the molecular and ion-molecular equations of these reactions.
219. Which of the salts K2CO3, FeCl3, K2SO4, ZnCl2 undergo hydrolysis? Draw up the ionic-molecular and molecular equations for the hydrolysis of the corresponding salts. What is the pH value (> 7 <) have solutions of these salts?
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