Solution of the variant 47 KR №1 - chemisty Shimanovich
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The decision of the test No. 1 of option 47 of the collection of chemistry Shimanovich I.E.
(formatted in Microsoft Word)
Tasks:
8. Calculate the equivalent and equivalent mass of H3PO4 in the formation reactions:
a) hydrogen phosphate;
b) dihydrogen phosphate;
c) orthophosphate.
30. Write the electronic formulas of the atoms of the elements with serial numbers 14 and 40. How many free d-orbitals do the atoms of the last element have?
52. Based on the position of the metal in the periodic system, give a motivated answer to the question: which of the two hydroxides is the stronger base: Ba (OH) 2 or Mg (OH) 2; Ca (OH) 2 or Fe (OH) 2; Cd (OH) 2 or Sr (OH) 2?
74. What should be understood as the oxidation state of an atom? Determine the oxidation state of the carbon atom and its valence, due to the number of unpaired electrons, in the compounds CH4, CH3OH, HCOOH, CO2
95. The reaction of benzene combustion is expressed by the thermochemical equation:
C6H6 (l) 7 1/2 O2 (g) = 6CO2 (g) 3H2O (g); H =?
Calculate the thermal effect of this reaction if it is known that the molar heat of vaporization of benzene is 33.9 kJ.
Answer: -3135.58 kJ
116. Calculate Ho, So and GoT of the reaction proceeding according to the equation:
TiO2 (c) 2C (c) = Ti (c) 2CO (g)
Is the reaction of TiO2 reduction with carbon possible at temperatures of 1000 and 3000 K?
Answer: 722.86 kJ; 364.84 J / K; 358.02 kJ; -371.66 kJ
137. The equilibrium constant of the homogeneous system N2 3H2 2NH3 at a certain temperature is 0.1. The equilibrium concentrations of hydrogen and ammonia are 0.2 and 0.08 mol / l, respectively. Calculate the equilibrium and initial nitrogen concentration. Answer: [N2] p = 8 mol / l; [N2] ref = 8.04 mol / l.
154. Neutralization of 1 liter of a solution containing 1.4 g of KOH requires 50 cm3 of acid solution. Calculate the normality of the acid solution. Answer: 0.53 n.
176. How many grams of phenol C6H5OH should be dissolved in 125 g of benzene; so that the crystallization temperature of the solution is below the crystallization temperature of benzene by 1.7 °? The cryoscopic constant of benzene is 5.1 °. Answer: 3.91 g
196. Make molecular equations of reactions, which are expressed by ionic-molecular equations:
a) Zn2 H2S = ZnS 2H
b) HCO-3 H = H2O CO2
c) Ag Cl- = AgCl
207. Make up the ionic-molecular and molecular equations for the hydrolysis of salts Pb (NO3) 2, Na2CO3, Fe2 (SO4) 3. What is the pH value (> 7 <) have solutions of these salts?
(formatted in Microsoft Word)
Tasks:
8. Calculate the equivalent and equivalent mass of H3PO4 in the formation reactions:
a) hydrogen phosphate;
b) dihydrogen phosphate;
c) orthophosphate.
30. Write the electronic formulas of the atoms of the elements with serial numbers 14 and 40. How many free d-orbitals do the atoms of the last element have?
52. Based on the position of the metal in the periodic system, give a motivated answer to the question: which of the two hydroxides is the stronger base: Ba (OH) 2 or Mg (OH) 2; Ca (OH) 2 or Fe (OH) 2; Cd (OH) 2 or Sr (OH) 2?
74. What should be understood as the oxidation state of an atom? Determine the oxidation state of the carbon atom and its valence, due to the number of unpaired electrons, in the compounds CH4, CH3OH, HCOOH, CO2
95. The reaction of benzene combustion is expressed by the thermochemical equation:
C6H6 (l) 7 1/2 O2 (g) = 6CO2 (g) 3H2O (g); H =?
Calculate the thermal effect of this reaction if it is known that the molar heat of vaporization of benzene is 33.9 kJ.
Answer: -3135.58 kJ
116. Calculate Ho, So and GoT of the reaction proceeding according to the equation:
TiO2 (c) 2C (c) = Ti (c) 2CO (g)
Is the reaction of TiO2 reduction with carbon possible at temperatures of 1000 and 3000 K?
Answer: 722.86 kJ; 364.84 J / K; 358.02 kJ; -371.66 kJ
137. The equilibrium constant of the homogeneous system N2 3H2 2NH3 at a certain temperature is 0.1. The equilibrium concentrations of hydrogen and ammonia are 0.2 and 0.08 mol / l, respectively. Calculate the equilibrium and initial nitrogen concentration. Answer: [N2] p = 8 mol / l; [N2] ref = 8.04 mol / l.
154. Neutralization of 1 liter of a solution containing 1.4 g of KOH requires 50 cm3 of acid solution. Calculate the normality of the acid solution. Answer: 0.53 n.
176. How many grams of phenol C6H5OH should be dissolved in 125 g of benzene; so that the crystallization temperature of the solution is below the crystallization temperature of benzene by 1.7 °? The cryoscopic constant of benzene is 5.1 °. Answer: 3.91 g
196. Make molecular equations of reactions, which are expressed by ionic-molecular equations:
a) Zn2 H2S = ZnS 2H
b) HCO-3 H = H2O CO2
c) Ag Cl- = AgCl
207. Make up the ionic-molecular and molecular equations for the hydrolysis of salts Pb (NO3) 2, Na2CO3, Fe2 (SO4) 3. What is the pH value (> 7 <) have solutions of these salts?
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