File:21. Дали водата секогаш го гаси огнот?.ogv

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Македонски: Во длабнатината на една тула се става магнезиум во крупни и во поситни парченца (струганици). Магнезиумот се пали и врз него се прска вода од шприц. Доаѓа до силно распалување (распламтување), поради тоа што доаѓа до егзоенергетски хемиски реакции опишани со равенките:

Mg(s) + H2O(l) = MgO(s) + H2(g)

2H2(g) + O2(g) = 2H2O(g)

Причината е реакцијата на магнезиум со вода. При оваа реакција се ослободува водород, кој веднаш се пали. Наместо жарта да се изгасне, таа повеќе се распламтува. Понекогаш се можни мали експлозии поради образувањето смеса од водород и воздух, а за ова придонесува и контактот на студената вода и металот. Оваа реакција е пример за тоа дека водата не секогаш може да го изгасне огнот.

Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје.
English: Put some magnesium (both chunks and scraping) into a dent of a brick. Light the magnesium by a burner and spray it with water (use a syringe). A strong ignition occurs (often with lots of sparks), as a result of the two exoenergetic reactions, described by the equations:

Mg(s) + H2O(l) = MgO(s) + H2(g)

2H2(g) + O2(g) = 2H2O(g)

The reason is the reaction of magnesium with water. The liberated hydrogen ignites instantaneously. Instead of fading up, the glow transits into a small fire. Often, minor explosions occur due to formation of a mixture of hydrogen and air, strengthened by the effect due to the contact of the cold water and the hot metal. This is an example that in some cases the water is not capable to extinguish the fire.

Planned and performed by Marina Stojanovska, Miha Bukleski and Vladimir Petruševski, Department of Chemistry, FNSM, Ss. Cyril and Methodius University, Skopje, Macedonia.
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Author Карас Студио

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