в электропаяльнике при напряжении 220 в возникает ток силой 0,2 А. Какое количество олова, взятого при 22 С, можно расплавить за 2 мин, если КПД паяльника 90 % ? Удельная теплоемкость олова 230 Дж/кг * К, его удельная теплота плавления 59 000 Дж/кг . температура плавления олова 232 С.

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

  предлоги английский срочно

She's quite ... lively person compared with .,. rest of her family

98. Let's wait till^f. wind drops before we put If. tent up.

99job. discovery ... radium marked ...beginning of... new era ol

medicine.

100. . . . house in which I grew up no longer exists.

101... man was accused of having stolen ... woman's purse...

102 ... teacher reminded ... students of their assignment.

103... teacher encouraged us to consult ... dictionary whenever we were uncertain of... spelling of... word.

104.I tried everything but... baby still wouldn't stop crying.

105. Linda offered to look after my cat when I was out of... town.

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I went to ... theatre last night and saw... fabulous play. I thought il

112.

was good, anyway, but I read in ... papers this morning thai critics had slammed it.

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 120. He slipped and ... wine spilled all over... carpet.

121. Brian seems... ideal person for ...job.

122. After studying ... languages at ... university Steven became ... interpreter at... United Nations.

123. It's very important for... parents to encourage ... independence in their children.

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133. Many people are severely allergic to ... poisonous plants such as... ivy,... hemlock and ... pokeweed.

134. To produce their fine silk,... silkworms feed chiefly on ... mulberry leaves.

135. Do you know ... white-haired man who is feeding ... pigeons?

136. It was... lovely house but... stairs were too steep for... old people.

137. If you give me ... hand with ... dishes, we can go out together.

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140. We spent... wonderful evening with ... Stones.

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142. ... room was completely empty so some of us sat down on ... floor while ... others leaned against... wall.

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