. Introduction to inorganic chemistry . t to note that there was atno time rest, there was simplyequal motion in both the hydrogen atmospheresurrounded the cylinder, the hy-drogen gas moved more rapidlyinto the cylinder than the air in-side could move out, and hence anexcess of pressure quickly arosein the interior. The cylinder on the right issimilar, but a vessel C filled withcarbon dioxide, a gas heavier thanair (density , air = 1), sur-rounds it. Here the air movesout faster than the gas can movein, a reduction in pressure takesplace, and the water measureme
. Introduction to inorganic chemistry . t to note that there was atno time rest, there was simplyequal motion in both the hydrogen atmospheresurrounded the cylinder, the hy-drogen gas moved more rapidlyinto the cylinder than the air in-side could move out, and hence anexcess of pressure quickly arosein the interior. The cylinder on the right issimilar, but a vessel C filled withcarbon dioxide, a gas heavier thanair (density , air = 1), sur-rounds it. Here the air movesout faster than the gas can movein, a reduction in pressure takesplace, and the water measurement shows that the lighter a gas is in bulk, thefaster its parts move by diffusion in any direction. The rate isinversely proportional to the square root of the density of the , for hydrogen and air it is in the ratio VI : , or : air and carbon dioxide it is VI. 53 : Vl, or : 1. Chemical Properties of Hydrogen. — Hydrogen, delivered froma jet, burns in air or pure oxygen. A cold vessel held over the almost. Via. 38. HYDROGEN 109 invisible blue flame condenses to droplets of water the steam that isproduced. Although the flame gives little light, it is exceedingly melts in it easily. In a closed space it produces a tem-perature of over 2500°. When hydrogen and oxygen are mingled in asuitable burner, and the flame is allowed to play on a piece of quick-lime, the latter becomes white-hot at the spot where the flame meetsit. This result is called a calcium light or lime light. When the gases are mixed in a glass vessel, the chemical action isvery slow at ordinary temperatures, no perceptible amount of unionoccurring in a period of five years. If the mixture is sealed up andkept at 300°, after several days a small part is found to have com-bined to form water. At 518°, hours are required before the union iscomplete. At 600° the interaction is rapid, but not explosive. At700° the combination is almost instantaneous. Hence contact witha b
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