Guest IP-stamp: fr/JbzbPKZJ2M guest

17.05.2015 18:10               URL #1 Две медсестры готовили раствор этилового спирта 70% (v/v - объемных процентов). Для его приготовления они использовали 100% этиловый спирт (для простоты не будем решать про 96%) и воду. Первая отмерила 700 мл спирта и довела водой до литра, вторая отмерила 300 мл воды и довела спиртом до литра. 1. Какая из медсестер приготовила раствор спирта с большей концентрацией? 2. Какая из медсестер приготовила раствор спирта с правильной концентрацией? Варианты ответа:    первая, первая    первая, вторая    вторая, первая    вторая, вторая    обе сделали одинаковый правильный раствор    обе сделали одинаковый раствор <70%    обе сделали одинаковый hfcndjh >70%        / Selected problems,  #558419  / First who solve: nobody jet (from 10 // rest: 10) Area: Other chemistry Character & level: Simple (calc)

vb Advanced Member

17.05.2015 18:34                   URL #2 обе сделали неправильный раствор. у первой он меньше 70%. у второй - больше.

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18.05.2015 12:34               URL #3 ...и еще один возможный ответ, которого нет в списке обе сделали неправильный раствор. у первой он больше 70%. у второй - меньше. These members thanked the author (1): Rhizon Это сообщение — спам. Rhizon

guest: Елена IP-stamp: frp7wGBr7ezcM guest

02.06.2015 11:33               URL #4 Почему не проверяется? У обеих правильные концентрации растворов.

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02.06.2015 14:07               URL #5 Потому что концентрации разные, и ответ, соответственно, неправильный. Поэтому и не проверяется.

Rhizon Member

08.06.2015 18:59                   URL #6 Ответ не проверяется и правильный тоже... Что-то неправильно оформлено. Задача называется "О соединении спирта с водою". Это название диссертации Д.И. Менделеева, в которой он кроме всего прочего показал, что суммарный объем смешиваемых спирта и воды будет меньше, чем суммы объемов (из-за эффектов гидратации). Поэтому, добавляя спирт к 300 мл воды до 1 л, спирта вы добавите больше, чем 700 мл. А по условию вы должны приготовить раствор, в котором на 1 л раствора приходится 700 мл спирта, т.е. правильный раствор готовит первая сестра (хотя и ей до 1 л придется добавить воды больше, чем 300 мл). Правильный ответ: вторая, первая This post has been edited by Rhizon: 08.06.2015 19:00

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04.08.2017 11:24               URL #7 просто все

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16.10.2017 11:24               URL #8 обе сделали неправильный раствор. у первой он меньше 70%. у второй - больше. При смешивании спирта с водой обьем р-ра уменьшается, но надо еще учесть то, что раствор разргревается, и за счет этого увеличивается в объеме... Таким образом когда р-р остынет его объем станет меньше литра, ну и концентрация будет не 70%, а это зависит от того, что сильнее повлияет на объем р-ра, расширение за счет нагревания при растворении, или уменьшение объема р-ра, которое происходит при растворении спирта в воде.

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21.11.2017 15:39               URL #9 я за 2 вариант голосовал

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03.01.2018 21:11               URL #10 У нас можно найти проститутку на любой вкус. Даже самые придирчивые клиенты найдут себе то, что так долго искали.

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20.02.2018 14:11                   URL #11 Понятно Это сообщение — спам. Vorona

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