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«Несгораемый» платок

Автор: Василина 10-09-2010, 13:17

Носовой платок из хлопчатобумажной ткани надо намочить в воде, слегка отжать, а после этого пропитать этиловым спиртом. Теперь «волшебник» должен взять платок щипцами или пинцетом и с помощью длинной лучинки поднести пламя. Спирт сразу же вспыхнет — создается впечатление, что горит платок. При горении этанола образуется углекислый газ и вода:

С2Н5ОН + 3 02 = 2 СЮ2 + 3 Н20

и пламя будет почти бесцветным. Но горение вскоре прекратится, а платок остается невредимым, так как температура воспламенения влажной ткани гораздо выше, чем температура воспламенения паров этилового спирта.

(Л. Ю. Аликберова «Занимательная химия»)

 
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