Solution of the variant 64 KR №1 - chemisty Shimanovich
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The decision of the test No. 1 of option 64 of the collection of chemistry Shimanovich I.E.
(formatted in Microsoft Word)
Tasks:
6. What is equal to under n.u. equivalent volume of hydrogen? Calculate the equivalent weight of the metal if 0.28 L of hydrogen (NU) was consumed to reduce 1.017 g of its oxide. Answer: 32.68 g / mol.
28. What are isotopes? How can one explain that for most elements of the periodic table, atomic masses are expressed as a fractional number? Can atoms of different elements have the same mass? What are these atoms called?
46. Make the formulas of oxides and hydroxides of the elements of the third period of the periodic system, corresponding to their highest oxidation state. How does the acid-base character of these compounds change when going from sodium to chlorine? Write the reaction equations proving the amphotericity of aluminum hydroxide.
68. What is called the electric moment of a dipole? Which of the HCl, HBr, HI molecules has the greatest dipole moment? Why?
93. The reaction of combustion of methyl alcohol is expressed by the thermochemical equation:
CH3OH (g) + 3 / 2O2 (g) = CO2 (g) + 2H2O (g); H =?
Calculate the heat effect of this reaction if it is known that the molar heat of vaporization of CH3OH (l) is +37.4 kJ.
Answer: -726.62 kJ.
109. At what temperature the equilibrium of the system will come: CO (g) + 2H2 (g) CH3OH (g); H = -128.05 kJ? Answer: ~ 385.5 K.
134. The equilibrium of the homogeneous system 4HCl (g) + O2 2H2O (g) + 2C12 (g) was established at the following concentrations of revising substances: [H2O] p = 0.14 mol / l; [Cl2] p = 0.14 mol / L; [HC1] p = 0.20 mol / l; [O2] p = 0.32 mol / l. Calculate the starting concentrations of hydrogen chloride and oxygen.
Answer: [HC1] ref = 0.48 mol / l; [O2] ref = 0.39 mol / l.
151. What volume of a 10% sodium carbonate solution (area 1.105 g / cm3) is required to prepare 5 liters of a 2% solution (area 1.02 g / cm3)? Answer: 923.1 cm3.
172. What mass of aniline C6H5NH2 should be dissolved in 50 g of ethyl ether so that the boiling point of the solution is 0.53 ° higher than the boiling point of ethyl ether. Ebullioscopic constant of ethyl ether 2.12 °. Answer: 1.16 g.
194. Make the molecular equations of reactions, which are expressed by ion-molecular equations:
Fe (OH) 3 + 3H + = Fe3 + + 3H2O
Cd2 + + 2OH- = Cd (OH) 2
H + + NO-2 = HNO2
204. When mixing the solutions of FeCl3 and Na2CO3, each of the salts taken is hydrolyzed irreversibly to the end with the formation of the corresponding base and acid. Express this joint hydrolysis by ionic-molecular and molecular equations.
(formatted in Microsoft Word)
Tasks:
6. What is equal to under n.u. equivalent volume of hydrogen? Calculate the equivalent weight of the metal if 0.28 L of hydrogen (NU) was consumed to reduce 1.017 g of its oxide. Answer: 32.68 g / mol.
28. What are isotopes? How can one explain that for most elements of the periodic table, atomic masses are expressed as a fractional number? Can atoms of different elements have the same mass? What are these atoms called?
46. Make the formulas of oxides and hydroxides of the elements of the third period of the periodic system, corresponding to their highest oxidation state. How does the acid-base character of these compounds change when going from sodium to chlorine? Write the reaction equations proving the amphotericity of aluminum hydroxide.
68. What is called the electric moment of a dipole? Which of the HCl, HBr, HI molecules has the greatest dipole moment? Why?
93. The reaction of combustion of methyl alcohol is expressed by the thermochemical equation:
CH3OH (g) + 3 / 2O2 (g) = CO2 (g) + 2H2O (g); H =?
Calculate the heat effect of this reaction if it is known that the molar heat of vaporization of CH3OH (l) is +37.4 kJ.
Answer: -726.62 kJ.
109. At what temperature the equilibrium of the system will come: CO (g) + 2H2 (g) CH3OH (g); H = -128.05 kJ? Answer: ~ 385.5 K.
134. The equilibrium of the homogeneous system 4HCl (g) + O2 2H2O (g) + 2C12 (g) was established at the following concentrations of revising substances: [H2O] p = 0.14 mol / l; [Cl2] p = 0.14 mol / L; [HC1] p = 0.20 mol / l; [O2] p = 0.32 mol / l. Calculate the starting concentrations of hydrogen chloride and oxygen.
Answer: [HC1] ref = 0.48 mol / l; [O2] ref = 0.39 mol / l.
151. What volume of a 10% sodium carbonate solution (area 1.105 g / cm3) is required to prepare 5 liters of a 2% solution (area 1.02 g / cm3)? Answer: 923.1 cm3.
172. What mass of aniline C6H5NH2 should be dissolved in 50 g of ethyl ether so that the boiling point of the solution is 0.53 ° higher than the boiling point of ethyl ether. Ebullioscopic constant of ethyl ether 2.12 °. Answer: 1.16 g.
194. Make the molecular equations of reactions, which are expressed by ion-molecular equations:
Fe (OH) 3 + 3H + = Fe3 + + 3H2O
Cd2 + + 2OH- = Cd (OH) 2
H + + NO-2 = HNO2
204. When mixing the solutions of FeCl3 and Na2CO3, each of the salts taken is hydrolyzed irreversibly to the end with the formation of the corresponding base and acid. Express this joint hydrolysis by ionic-molecular and molecular equations.
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