- •Chemistry
- •Introduction
- •Some facts about chemistry
- •Some facts about atoms (I)
- •Some facts about atoms (II)
- •The atomic model
- •The nature of ceramics
- •Construction materials
- •The measurements in chemistry
- •The metric system
- •Isotopes
- •Liquids (I)
- •Words to be remembered:
- •Liquids (II)
- •Words to be remembered:
- •Solid state (I)
- •Words to be remembered:
- •Solid state (II)
- •Words to be remembered:
- •Properties of solids
- •Notes on the texts:
- •Words to be remembered:
- •Organic chemistry
- •Word to be remembered:
- •Elementary carbon
- •Words to be remembered:
- •Notes on the texts:
- •Carbon dioxide
- •Words to be remembered:
- •Words to be remembered:
- •Hydrogen
- •Words to be remembered):
Words to be remembered:
hydrogen mixture
principal petroleum
decomposition furnace
vegetable to consist
presence to remain
absence gas well
volatile oil well
access compound
№ 19
Hydrogen
Hydrogen is known to be the lightest of the elements. If the temperature is 20°С, it is a colourless, odourless, tasteless gas, its density being 0,08987, i.e. 1/15 that of air.
Hydrogen was liquefied. The device used for it proved to be similar to that used in liquefying air. The gas is only slightly soluble in water, its solubility under standard pressure in 100 ml of water being 1,93 ml at 0°C.
Hydrogen could be found in the free state only in minute quantities because of its marked chemical activity. It is known to be prepared in the laboratory by its liberation from acids, bases, or water.
Specialists consider hydrogen to be an extremely promising energy source. The reserves of hydrogen are known to be practically unlimited, it containing almost three times more thermal energy than benzene. Another plus is that hydrogen can be used as fuel in transport, industry and at home.
Extensive use of hydrogen as an energy source will help to keep the environment clean - hydrogen combustion produces simply the vapour of distilled water.
Hydrogen is easy to transport and store. It could be shipped over large distances using conventional pipelines.
Even today it costs several times less to transport by pipe-lines than to transmit electricity across huge power lines, bike any other gaseous fuel it could be accumulated and kept for a long time either in conventional or natural reservoirs.
Scientists have found many ways of producing hydrogen on a commercial scale - basically from ordinary water. Large volumes of this fuel could be obtained from coal, its reserves being tremendous.
Words to be remembered):
tasteless liberation
density source
to liquefy environment
device combustion
similar pipe-line
soluble tremendous
quantity ordinary