Hydrogen Flashcards
% of hydrogen in the universe?
70
% of H in the atmosphere? % of H on Earth?
0.15, 15.4
What did Harold C. Urey win a Nobel Prize for? What year?
In the year 1934, an American scientist, Harold C. Urey, got Nobel Prize for separating hydrogen isotope of mass number 2 by physical methods.
% of deuterium? Half life of tritium?
0.0156, 12.33 years
Internuclear distance of H and D?
The same
High purity H2 is produced by?
Electrolyzing warm aqueous Ba(OH)2 with nickel electrodes
Water gas/ syngas is?
CO + H2
How is CO2 removed in water gas shift reaction?
sodium arsenite
Which bond has the highest for a single bond between two atoms of any element?
H-H
0.081% of H2 is dissociated at _____K and 95.5% of H2 dissociates at _____K
2000K, 5000K
CO + H2 ——-> CH3OH. What’s the catalyst?
Cobalt
Metallic hydrides electric conductivity?
Not as good as the parent metals
Lattices of which elements maintain same lattice when forming hydrides?
Ni, Pd, Ce, Ac
Does PH5 exist?
NO
What’s higher for H2O than D2O
Dielectric constant
Angle and bond length of water?
104.5 degree, 95.7pm
When do ice form cubic lattice? Bond length?
low temperatures, 276pm
Why does water have a high hydrating tendency?
Dielectric constant
How many H-bonded water in CuSO4.5H2O
1
Clark method uses?
Ca(OH)2
Permanent hardness is caused by?
Chlorides and sulphates
Calgon is?
Na6P6O18
What is used in anion exchange method
Amine
Three methods of production for H2O2?
- Acidifying BaO2 and removing water by evaporating (under reduced pressure)
- Peroxodisulphate hydrolysis (lab prep of D2O2)
- Industrially, auto-oxidation of 2-alkylanthraquinols
Commercial h2o2 is?
10V
Stabilizer for H2O2
Urea
H2O2 is used to make
Hydroquinone, tartaric acid, cephalosporin
H2O2 angles in gas phase? Solid phase?
- 8, 111.5 (laptop)
101. 9, 90.2 (laptop)
H2O2 action in acidic medium?
- oxidation: +2
2. reduction: -2
H2O2 action in basic medium
- oxidation: +2
2. reduction: -2
