В двухкомнатной квартире площадь один комнаты 20,64 м2, а площадь другой комнаты в 2,4 раза меньше. Найдите площадь этих двух комнат вместе.

Fe(II) проявляет восстановительные свойства в реакции

1) Fe(OH)2 + H2SO4 = FeSO4 + 2H2O

2) Fe(OH)2 = FeO + H2O

3) FeSO4 + Zn = Fe + ZnSO4

4) 4Fe(OH)2 + O2 + 2H2O = 4Fe(OH)3

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10. Правые части уравнений

1) ... + ... --> 2Н3РО4

2) ... + ... --> Н2О + SO2

3) ... + ... --> ZnSO4 + Сu

4) ... + ... --> Cu(OH)2↓ + Na2SO4

относятся соответственно к реакциям:

1) соединения, разложения, обмена, замещения

2) соединения, разложения, замещения, обмена

3) разложения, обмена, соединения, замещения

4) разложения, замещения, обмена, соединения

11. Вода разлагается на кислород и водород при пропускании через нее постоянного электриче­ского тока. Следовательно, разложение воды ­реакция:

1) каталитическая                                         3) экзотермическая

2) восстановления                                         4) эндотермическая

12. В генетическом ряду Li → Х → LiOH → У, вместо Х и У следует написать:

1) LiH и LiNОз                                              3) Li2О И Li2SO4

2) Li2О2 и Li3N                                               4) LiCl и Са(ОН)2

13. Дополните фразу недостающим словосочетанием: в процессе дыхания животных и человека:

1) выделяются углекислый газ и водород

2) поглощается кислород, а выделяется водород

3) поглощается кислород, а выделяется углекислый газ

4) поглощается смесь кислорода и водорода, выделяется углекислый газ

14. Чтобы наблюдать изменение окраски индикатора из оранжевой в красную, следует:

1) к водному раствору метилоранжа добавит кислоты

2) к водному раствору метилоранжа добавит щелочи

3) к щелочному раствору фенолфталеина добавить кислоты

4) к кислотному раствору лакмуса добавить щелочи

15. Только кислота образуется при взаимодействии пары веществ:

1) N2О5 и Н2О                                              3) SОз и СаО

2) Na2О и Н2О                                              4) NaCl и H2SO4

16. Правой частью уравнения (с коэффициентами)  3Na2О + 2Н3РО4 = является:

1) 6NaOH + Р2О5                                          3) NаЗРО4 + 6Н2О

2) 2NаЗРО4 + 3Н2О                                      4) Р2О5 + 6NaH

17. При выпаривании 40 г раствора осталось 10 г  соли. Массовая доля растворенной соли в растворе была равна:

1) 10%                                                          3) 15%

2) 20%                                                          4) 25%

18. Гидроксид натрия количеством вещества 1 моль вступит в реакцию с углекислым газом объемом (н.у.):

1) 22,4 л                                                       3) 5,6 л 

2) 11,2 л                                                       4) 13,44 л

Уравнение химической реакции имеет вид 2NaOH + СО2 = Nа2СО3 + Н2О

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