Solution of the variant 19 KR №1 - chemisty Shimanovich
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The decision of the test No. 1 of option 19 of the collection on chemistry Shimanovich I.E.
(designed in Microsoft Word)
Tasks:
19. The neutralization of 9.797 g of orthophosphoric acid consumed 7.998 g of NaOH. Calculate the equivalent, equivalent mass and basicity of H3PO4 in this reaction. Based on the calculation, write the reaction equation. Answer: 0.5 mol, 49 g / mol
39. What is the Pauli principle? Could there be p7 or d12 electrons on some sublevel of the atom? Why? Write the electronic formula of the atom of the element with atomic number 22 and indicate its valence electrons.
59. What are the lowest and highest oxidation states of carbon, phosphorus, sulfur and iodine? Why? Draw up the formulas of the compounds of these elements corresponding to these oxidation states
79. Draw an energy diagram of the formation of F2 molecules by the method of molecular orbitals (MO). How many electrons are in the bonding and antibonding orbitals? What is the bond order in this molecule?
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.
119. Calculate at what temperature the dissociation of phosphorus pentachloride will begin, proceeding according to the equation:
PC15 (g) = PC13 (g) + Cl2 (g); H = + 92.59 kJ. Answer: 509 K.
139. Why does the equilibrium of the N2 + 3H2 2NH3 system shift when the pressure changes and the equilibrium of the N2 + O2 2NO system does not shift? Motivate your answer on the basis of calculating the speed of forward and reverse reactions in these systems before and after the pressure change. Write expressions for the equilibrium constants of each of these systems.
159. From 700 g of 60% sulfuric acid, 200 g of water were removed by evaporation. What is the percentage of the remaining solution? Answer: 84%.
179. Calculate the boiling point of a 15% aqueous solution of propyl alcohol С3Н7ОН. Ebullioscopic water constant 0.52 °. Answer: 101.52 ° C.
199. Make molecular equations of reactions, which are expressed by ionic-molecular equations:
a) Be (OH) 2 + 2OH- = BeO22- + 2H2O
b) CH3COO- + H + = CH3COOH
c) Ba2 + + SO2-4 = BaSO4
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?
(designed in Microsoft Word)
Tasks:
19. The neutralization of 9.797 g of orthophosphoric acid consumed 7.998 g of NaOH. Calculate the equivalent, equivalent mass and basicity of H3PO4 in this reaction. Based on the calculation, write the reaction equation. Answer: 0.5 mol, 49 g / mol
39. What is the Pauli principle? Could there be p7 or d12 electrons on some sublevel of the atom? Why? Write the electronic formula of the atom of the element with atomic number 22 and indicate its valence electrons.
59. What are the lowest and highest oxidation states of carbon, phosphorus, sulfur and iodine? Why? Draw up the formulas of the compounds of these elements corresponding to these oxidation states
79. Draw an energy diagram of the formation of F2 molecules by the method of molecular orbitals (MO). How many electrons are in the bonding and antibonding orbitals? What is the bond order in this molecule?
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.
119. Calculate at what temperature the dissociation of phosphorus pentachloride will begin, proceeding according to the equation:
PC15 (g) = PC13 (g) + Cl2 (g); H = + 92.59 kJ. Answer: 509 K.
139. Why does the equilibrium of the N2 + 3H2 2NH3 system shift when the pressure changes and the equilibrium of the N2 + O2 2NO system does not shift? Motivate your answer on the basis of calculating the speed of forward and reverse reactions in these systems before and after the pressure change. Write expressions for the equilibrium constants of each of these systems.
159. From 700 g of 60% sulfuric acid, 200 g of water were removed by evaporation. What is the percentage of the remaining solution? Answer: 84%.
179. Calculate the boiling point of a 15% aqueous solution of propyl alcohol С3Н7ОН. Ebullioscopic water constant 0.52 °. Answer: 101.52 ° C.
199. Make molecular equations of reactions, which are expressed by ionic-molecular equations:
a) Be (OH) 2 + 2OH- = BeO22- + 2H2O
b) CH3COO- + H + = CH3COOH
c) Ba2 + + SO2-4 = BaSO4
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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