1.Пара формул солей, в водных растворах которых фенолфталеин имеет одинаковую окраску:
А. Ba(NO3)2 и K2S
Б. CH3ONa и МgCl2
В. CH3COONa и К3РО4
Г. Zn(NO3)2 и AlCl3
2.При повышении температуры на 200С (температурный коэффициент равен 3) скорость химической реакции увеличится:
А. В 3 раза
Б. В 9 раз
В. В 27 раз
Г. В 81 раз
3.Ряд формул веществ, с каждым из которых взаимодействует оксид бария:
А. HCl, H2, HNO3 Б. Р2О5, Н2SO4, Мg
В. SO3, КОН, Fe(OH)2
Г. SiO2, H2O, CH3COOH
4.Определите вещества Х1, Х2, Х3 в схеме превращений
уксусная кислота → Х1 → Х2 → Х3. Как называется вещество Х3 в медицине?
5.Среди веществ, формулы которых ZnS, KNO3, FeSO4, KМnO4, Na3{Cr(OH)6}, выберите вещества, вступающие в реакции ионного обмена с соляной кислотой. Одно из уравнений запишите в молекулярном и ионном виде.
6.Натрий, полученный электролизом расплава 46,8 граммов хлорида натрия, обработали избытком воды. Рассчитайте массу 10% раствора серной кислоты, необходимой для нейтрализации полученного раствора.
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CIVII20II7
Объяснение:
определим валентность хлора в его соединении с кислородом — Cl2O7.
1. Записываем известную валентность кислорода над формулой. Неизвестную валентность обозначаем буквой x:
Clx2OII7.
2. Находим сумму единиц валентности каждого элемента. Для этого его валентность умножаем на число атомов:
x⋅2=2⋅7.
3. Вычисляем x:
2x=14,x=14:2=7.
Валентность хлора равна VII:
ClVII2OII7.
Составление формулы бинарного соединения по валентностям химических элементов
Если известны валентности двух элементов, то можно составить формулу их соединения.