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Hydrogen: Lab Reparation Test Position In The Periodic Table
Table of content
Position of Hydrogen in the periodic table.
Isotopes of Hydrogen
Lab Reparation Activity series of metals
Test for Hydrogen
Uses of Hydrogen
Position Of Hydrogen In The Periodic Table
Hydrogen occupies a position in group 1 element. Hydrogen can be regarded as belonging to group 7 elements that is those elements with one electron less than their noble gas neighbors so, hydrogen cold be groomed with the halogens on group 7 but due to the way elements are grouped in the periodic travel using the atomic number. It is now proper to place hydrogen in both alkaline metals and halogens although.
isotopes Of Hydrogen
There are three (3) isotopes of hydrogen
It was discoved by Henry Cavendish in 1766.
Action of Zinc on an acid-Dil. Hcl
H2SO4 attack metallic Zn with liberation of H2 gas.
No heating is necessary.
Zn(s) + 2Hcl(ag) —> Zncl(aq) + H2(g)
Zn(s) + H2SO4(ag) —> Znso4(aq) +H2(g)
Action of sodium on cold water
The addition of sodium in cold water liberates hydrogen in that water.
2Na(s) + 2H2O(i) —> 2NaOH(ag) + H2(ag)
Action of iron on steam
3Fe(s) + 4H2O(g) —> Fe3O4 +4H2(g)
Hydrogen is placed in the series to indicate the position it would occpy. Metals above hydrogen liberate H from acids while those below it don't. Metals high-up are electroive and very reactive metals below are less reactive.
1. From water gas(Bosch Process)
In this process, steam is allowed to pass over red hot coke(carbon) at 1200°c, a mixture of carbon(ii)oxide and Hydrogen know as water gas is produced. Excess steam is mixed In H2O gas and passed over a catalyst iron(iii)oxide or dmmium(iii)oxide at 450°c. The carbon(ii)oxide in H2O gas is converted to carbon(iv)oxide with yield of hydrogen.
Endothermic (Steam=H2O(g))+ (Coke=C(s)) —>(water gas=CO(g) +H2(g))
Exothermic (H2O gas=CO(g)) + H2(g) —> CO2(g) + 2H2(g)
2. From Methane
Steam is mixed with methane and passed over a nickel catalyst at about 800°c. The mixture of carbon(ii)oxide and hydrogen produced I'd know as synthesis gas
(Methane=CH4(g) + (Steam=H2O(g) —> (Synthesis gas CO(g) + 3H2(g)
3. By Electrolyte Methods
Pure hydrogen is obtained as by-election product in the electrolysis of brine for manufacturing of NaOH and Chlorine.
Physical Properties Of Hydrogen
1. Colourless, odourless and tasteless
2. Neutral to moist litmus paper
3. The highest know substance
4. It has very low boiling point -253°c
5. It is insoluble in H2O
Chemical Properties Of Hydrogen
1. Combination reactions: It combines with metals and non-metals to form electrovalent and covalent hydrides.
a) With Metals: Hydrogen combines with metals to form ionic hydrides.
b) With Oxygen: Hydrogen combines with oxygen to produce steam and burns with pale blue flame.
2H2(g) + O2(g) —> 2H2O(g)
c) With halogens: Hydrogen combines with halogens to produce halides
Cl2(g) + H2(g) —> 2H2O(g)
Br(g) + H2(g) —> 2HBr(g)
Hydrogen is a strong rescuing agent
It reduces oxides of Cu, Pb, Fe, and an to metals when heated in steam.
CuO(s) + H2(g) —> Cu(s) +H2O(g)
Fe2O3(s) + 3H2(g) —> Fe(s) + 3H2O
Test For Hydrogen
In sort a lighted splinter into a test tube containing unknown gas it hydrogen, burns with a pop sound.
Uses Of Hydrogen
1. Used in manufacturing of NH3, Hcl and methanol.
2. Used for filling ballons due to its low density.
3. Used in Oxy-hydrogen flame to produce high temperature that can melt metals.
4. Hydrogen is a constituent of many gaseous fuels eg H2O gas and coal gas. Liquid hydrogen is also used as a rocket fuel.