Scientific amusements . Pyrophoric iron. acids. If some nitric acid is poured on iron nails, a streamof red, nitrous vapour is let loose, and the oxidised iron isdissolved in the liquid to the condition of nitrate of experiment is very easy to perform, and it gives anidea of the energy of certain chemical actions. We haveendeavoured to represent its appearance on page nitric acid does not act on iron, and prevents itbeing attacked by Ot-dinary nitHb acid. This property has NITRIC ACID. 25 given rise to a very remarkable experiment on passiveiron. It consists in placing some
Scientific amusements . Pyrophoric iron. acids. If some nitric acid is poured on iron nails, a streamof red, nitrous vapour is let loose, and the oxidised iron isdissolved in the liquid to the condition of nitrate of experiment is very easy to perform, and it gives anidea of the energy of certain chemical actions. We haveendeavoured to represent its appearance on page nitric acid does not act on iron, and prevents itbeing attacked by Ot-dinary nitHb acid. This property has NITRIC ACID. 25 given rise to a very remarkable experiment on passiveiron. It consists in placing some nails in a glass, intowhich some fuming nitric acid is poured, which producesno result ; the fuming acid is then taken out, and is re-placed by ordinary nitric acid, which no longer acts on. Iron and nitric acid. the iron rendered passive by the smoking acid. After this,if the nails are touched by a piece of iron, which has notundergone the action of nitric acid, they are immediatelyacted upon, and a giving off of nitrous vapour is manifestedwith great energy. Lead is a verj- soft metal, and caneven be scratched by the nails. It is also extremely 26 CHEMISTRY. pliable, and so entirely devoid of elasticity that when bentit has no tendency whatever to return to its primitive is heavy, and has a density represented by 11-4;that is to say, the weight of a quart of water being onekilogram, that of the same volume of lead is 11 -400 figure below represents cylindrical bars of the best known metals, all weighing thePlatinum Density 2150 same, showing their -omparative density. 1 GoldD. 19-25 ^^^^^ ^^ ^.^^ .^ ^^p^j^jg ^f ^^^j^g a Mercury D. 13-66 a beautiful crystalline form when placed in solution by a metal thatis less oxydisable. The crystalliza-siiverD. 10-
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
