Solution of the variant 91 KR №1 - chemisty Shimanovich

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Solution of the variant 91 KR №1 - chemisty Shimanovich

The decision of the test No. 1 of option 91 of the collection of chemistry Shimanovich I.E.
(formatted in Microsoft Word)

Tasks:

16. On oxidation of 16.74 g of a divalent metal, 21.54 g of oxide was formed. Calculate the equivalent masses of the metal and its oxide. What are the molar and atomic masses of a metal?

34. How many and what values ​​can the magnetic quantum number m1 take at the orbital number l = 0, 1, 2 and 3? What elements in the periodic table are called s-, p-, d- and f-elements? Give examples.

43. What is electronegativity? How does the electronegativity of p-elements change in the period, in the group of the periodic system with an increase in the ordinal number? Why?

75. What forces of molecular interaction are called orientational, inductive and dispersive? When do these vultures appear and what is their nature?

87. Crystalline ammonium chloride is formed by the interaction of gaseous ammonia and hydrogen chloride. Write the thermochemical equation for this reaction by calculating its thermal effect. How much heat will be released if 10 liters of ammonia were consumed in the reaction in terms of normal conditions? Answer: 78.97 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.

131. The rate constant of the N2O decomposition reaction proceeding according to the equation 2N2O = 2N2 + O2 is equal to 5 • 10-4. Initial concentration of N2O = 6.0 mol / l. Calculate the initial reaction rate and its rate when 50% of the N2O decomposes. Answer: 1.8 • 10-2; 4.5 x 10-3.

158. Mixed 247 g of 62% and 145 g of 18% sulfuric acid solution. What is the percentage of the resulting solution? Answer: 45.72%.

179. Calculate the boiling point of a 15% aqueous solution of propyl alcohol С3Н7ОН. Ebullioscopic water constant 0.52 °. Answer: 101.52 ° C.

181. Make up molecular and ion-molecular equations of reactions of interaction in solutions between:
a) NaHCO3 and NaOH;
b) K2SiO3 and HCl;
c) BaC12 and Na2SO4.

201. Make up the ionic-molecular and molecular equations of joint hydrolysis that occurs when mixing solutions of K2S and CrCl3. Each of the salts taken is hydrolyzed irreversibly to the end with the formation of the corresponding base and acid

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