HYDROGEN
Today I will speak of hydrogen and a practice we do from this item. Hydrogen is a colorless, odorless tasteless. Like most gaseous elements, hydrogen is diatomic molecules containing two atoms (H 2 ), but dissociates into free atoms at high temperatures. There are three known isotopes of hydrogen. The nucleus of each ordinary hydrogen atom contains a single proton. Deuterium (about 0.02% in natural hydrogen) contains one proton and one neutron in the nucleus, with atomic mass of two. Tritium (a radioactive isotope unstable) contains one proton and two neutrons in the nucleus and has an atomic mass of tres.A ordinary temperatures hydrogen is very reactive.
not react with oxygen at low temperatures, but it does so violently if the temperature rises above 700 ยบ C or any solid catalyst such as palladium or platinum finely divided, yielding water as a product of this reaction. When hydrogen is mixed with air or oxygen is turned on, the mixture explodes to form H2O, as the reaction
H 2 + O 2 -> H 2 O
This property is used in the practical process to identify the gas produced as hydrogen. Acts as a reducing agent for metal oxides such as copper oxide, removing the oxygen and leaving the metal free state. Hydrogen can combine with oxygen from oxides of other elements and reducing this character is used in metallurgy for metals with a high degree of purity such as tungsten filaments for electric lamps. Reacts with many non-metals. Combines with nitrogen in the presence of a catalyst to form ammonia NH3, with sulfur to form hydrogen sulfide H2S and chlorine to form hydrogen chloride, HCl. Also combined with more active metals like sodium, lithium and calcium, to form hydrides (NaH, LiH and CaH2). It also reacts with unsaturated organic compounds to form the corresponding saturated compounds.
There are many methods for obtaining hydrogen. Industrially it is usually obtained from water by electrolysis, or recovering from natural gas. In the laboratory, to obtain small amounts of hydrogen, zinc is usually treated with dilute hydrochloric acid, a process in which zinc chloride is formed and hydrogen follows: 2HCl + Zn
-> ZnCl 2 + H 2
hydrogen Globe
MATERIAL
beaker, filter flask, plug, globe, funnel, fine wire (1 meter), lighter, rod 1 meter sail.
Products:
Hydrochloric acid (HCl), granules of zinc or zinc powder, soap, glycerin.
PROCEDURE Enter settling tube a plug holes. Before, Rub with glycerin to keep from sticking. Enter
plug in the vacuum flask. Full
half the funnel with hydrochloric acid. Put the shot
zinc in the filter flask.
Place a balloon on the tube of the filter flask, tying with a rubber to prevent leakage. If the pressure is not strong enough, will not swell.
Under the supervision of your teacher, key opens the funnel with care, since it is dangerous.
When the balloon is inflated enough, tie it with thread. Notes that rises upwards. Ata
the candle to the stick. Turn it on.
Stand in an open and under the supervision of your teacher, about the candle to the globe and see what happens
e.
Today I will speak of hydrogen and a practice we do from this item. Hydrogen is a colorless, odorless tasteless. Like most gaseous elements, hydrogen is diatomic molecules containing two atoms (H 2 ), but dissociates into free atoms at high temperatures. There are three known isotopes of hydrogen. The nucleus of each ordinary hydrogen atom contains a single proton. Deuterium (about 0.02% in natural hydrogen) contains one proton and one neutron in the nucleus, with atomic mass of two. Tritium (a radioactive isotope unstable) contains one proton and two neutrons in the nucleus and has an atomic mass of tres.A ordinary temperatures hydrogen is very reactive.
not react with oxygen at low temperatures, but it does so violently if the temperature rises above 700 ยบ C or any solid catalyst such as palladium or platinum finely divided, yielding water as a product of this reaction. When hydrogen is mixed with air or oxygen is turned on, the mixture explodes to form H2O, as the reaction
H 2 + O 2 -> H 2 O
This property is used in the practical process to identify the gas produced as hydrogen. Acts as a reducing agent for metal oxides such as copper oxide, removing the oxygen and leaving the metal free state. Hydrogen can combine with oxygen from oxides of other elements and reducing this character is used in metallurgy for metals with a high degree of purity such as tungsten filaments for electric lamps. Reacts with many non-metals. Combines with nitrogen in the presence of a catalyst to form ammonia NH3, with sulfur to form hydrogen sulfide H2S and chlorine to form hydrogen chloride, HCl. Also combined with more active metals like sodium, lithium and calcium, to form hydrides (NaH, LiH and CaH2). It also reacts with unsaturated organic compounds to form the corresponding saturated compounds.
There are many methods for obtaining hydrogen. Industrially it is usually obtained from water by electrolysis, or recovering from natural gas. In the laboratory, to obtain small amounts of hydrogen, zinc is usually treated with dilute hydrochloric acid, a process in which zinc chloride is formed and hydrogen follows: 2HCl + Zn
-> ZnCl 2 + H 2
hydrogen Globe
MATERIAL
beaker, filter flask, plug, globe, funnel, fine wire (1 meter), lighter, rod 1 meter sail.
Products:
Hydrochloric acid (HCl), granules of zinc or zinc powder, soap, glycerin.
PROCEDURE Enter settling tube a plug holes. Before, Rub with glycerin to keep from sticking. Enter
plug in the vacuum flask. Full
half the funnel with hydrochloric acid. Put the shot
zinc in the filter flask.
Place a balloon on the tube of the filter flask, tying with a rubber to prevent leakage. If the pressure is not strong enough, will not swell.
Under the supervision of your teacher, key opens the funnel with care, since it is dangerous.
When the balloon is inflated enough, tie it with thread. Notes that rises upwards. Ata
the candle to the stick. Turn it on.
Stand in an open and under the supervision of your teacher, about the candle to the globe and see what happens
e. 
0 comments:
Post a Comment