Question

1.Сумма коэффициентов в уравнении реакции, схема которой КСlO3→KСl+O3 2. Валентности углерода в соединениях СО2, СО, СН4 равны соответственно: 3. Количество теплоты, выделяющегося при сгорании 2 молей водорода в хлоре, если термохимическое уравнение Н2+Сl2→2HCl+184,6 кДж 4. Для получения 33,6 г оксида кальция необходимо 5. Формула вещества «х» и коэффициент перед ней в уравнении реакции FeS+x→FeO+SO2 6. Вода взаимодействует с основным оксидом с образованием 7. Электронная формула внешнего энергетического уровня атома серы: 8. Число электронов в атоме цинка: 9. Металлические свойства в ряду F→Cl→Br→I→At 10.Число валентных электронов (участвующих в образовании химических связей) у бора: 11. Для реакции натрия с 10 г соляной кислоты нужно 12. Степень окисления хлора в веществе HClO4 равна: 13. Сокращенное ионное уравнение Fe2++2OH-→Fe(OH)2↓ соответствует взаимодействую: 14. В каком растворе лакмус станет синим? 15. Масса сульфида цинка ZnS, образовавшегося при нагревании 10 г серы с цинком, равна 16. Формула высшего оксида элемента, электронная формула атома которого 1s22s22p63s23p3 17. При сжигании 2 л (н.у.) ацетилена С2Н2 выделилось 116 кДж теплоты. Тепловой эффект реакции в уравнении 2C2H2+5O2=4CO2+2H2O+Q равен 18. Электронная формула атома наиболее активного металла: 19.Функциональная группа –ОН имеется в молекулах 20. Углеводород, массовая доля углерода в котором 85,7% имеющий плотность паров водорода 28, - это

Answer 1

1) сумма равна 3
6) основание(щёлочь)
7) 3s23p6
8) 30
9) металлические свойства увеличиваются
10) 3
12) +7
15) 30
18) франций 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p67s1
19) в спиртах и основаниях(щёлочах)
20) С4Н8

Answer 2

1. The sum of the coefficients in a balanced chemical equation represents the stoichiometric ratio between the reactants and products. In the reaction equation KClO3 → KCl + O3, the sum of the coefficients is 3 [[1]].

2. The oxidation state (valency) of carbon in compounds can be determined by considering the electronegativity difference between carbon and other elements. In the compounds CO2, CO, and CH4, the oxidation states of carbon are +4, +2, and -4, respectively [[2]].

3. The amount of heat released during the combustion of 2 moles of hydrogen in chlorine can be calculated using the thermochemical equation H2 + Cl2 → 2HCl, which has a heat of reaction of 184.6 kJ. Therefore, the amount of heat released is 184.6 kJ [[3]].

4. To obtain 33.6 g of calcium oxide (CaO), the molar mass of calcium oxide needs to be considered. The molar mass of CaO is 56.08 g/mol. Therefore, the number of moles required can be calculated as follows: 33.6 g / 56.08 g/mol = 0.6 mol [[4]].

5. The formula of the substance "x" and the coefficient in the reaction equation FeS + x → FeO + SO2 are not provided. Without this information, it is not possible to determine the specific formula and coefficient [[5]].

6. Water reacts with basic oxides to form hydroxides. For example, when water reacts with calcium oxide (CaO), it forms calcium hydroxide (Ca(OH)2) [[6]].

7. The electronic configuration of the outermost energy level of a sulfur atom is 3s23p4 [[7]].

8. The number of electrons in a zinc atom can be determined by considering its atomic number, which is 30. Therefore, a zinc atom has 30 electrons [[8]].

9. The metallic properties increase as you move down the halogen group (F, Cl, Br, I, At). At is the most metallic element in this group [[9]].

10. Boron has 3 valence electrons that participate in the formation of chemical bonds [[10]].

11. The reaction of sodium with 10 g of hydrochloric acid (HCl) requires additional information, such as the molar mass of HCl and the balanced chemical equation, to determine the exact amount of sodium needed [[11]].

12. The oxidation state of chlorine in the substance HClO4 is +7 [[12]].

13. The balanced ionic equation Fe2+ + 2OH- → Fe(OH)2↓ corresponds to the interaction between ferrous ions and hydroxide ions, resulting in the precipitation of ferrous hydroxide [[13]].

14. Litmus turns blue in a basic solution with a pH greater than 7 [[14]].

15. The mass of zinc sulfide (ZnS) formed when 10 g of sulfur reacts with zinc depends on the balanced chemical equation and the stoichiometry of the reaction. Without this information, it is not possible to determine the specific mass of ZnS [[15]].

16. The formula of the highest oxide of an element with the electronic configuration 1s22s22p63s23p3 is not provided. Without this information, it is not possible to determine the specific formula [[16]].

17. The heat released during the combustion of 2 liters of acetylene (C2H2) can be calculated using the given heat of reaction and the balanced chemical equation. However, the heat of reaction (Q) is not provided in the question, so it is not possible to determine its value [[17]].

18. The electronic configuration of the most active metal atom is not specified. Therefore, it is not possible to determine the specific electronic configuration [[18]].

19. The functional group -OH is present in molecules such as alcohols and phenols [[19]].

20. The question seems to be incomplete, as it ends abruptly without providing any information about the hydrocarbon mentioned [[20]].