Chemical Property of Hydrogen
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Chemical Property:
- Appearance/Colour:Colorless gas
- Vapor Pressure:Critical temperature is - 239.9 °C; noncondensible above this temperature
- Melting Point:-259.2 °C(lit.)
- Boiling Point:-252.8 °C(lit.)
- PKA:35(at 25℃)
- Flash Point:<-150°C
- PSA：0.00000
- Density:0.0899 g/cm3
- LogP:0.00000
- Water Solubility.:0.00017 g/100 mL
- XLogP3:0
- Hydrogen Bond Donor Count:0
- Hydrogen Bond Acceptor Count:0
- Rotatable Bond Count:0
- Exact Mass:2.0156500638
- Heavy Atom Count:0
- Complexity:0
- Transport DOT Label:Flammable Gas
- Purity/Quality:
-
99% *data from raw suppliers
Hydrogen ≥99.99% *data from reagent suppliers
Safty Information:
- Pictogram(s):
F+
- Hazard Codes:F+
- Statements:
12
- Safety Statements:
9-16-33
- MSDS Files:
-
SDS file from LookChem
Total 1 MSDS from other Authors
Useful:
- Chemical Classes:Toxic Gases & Vapors -> Simple Asphyxiants
- Canonical SMILES:[HH]
- Recent ClinicalTrials:Safety, Tolerability, and Pharmacokinetics (PK) of Single and Multiple Ascending Oral Doses of XEN1101.
- Recent EU Clinical Trials:An open-label study to evaluate the extended early bactericidal activity, safety, tolerability and pharmacokinetics of multiple doses (m.d.) of TMC207 oral solution (os) and isoniazid (JH), m.d. of TMC207 os and pyrazinamide (JZ), m.d. of TMC207 os and rifampin (JR) or m. oral d. of TMC207 os and isoniazid and pyrazinamide (JHZ), compared to the 3 principle drugs of standard anti-tuberculosis treatment (HRZ) in treatment-na?ve subjects with sputum-smear positive pulmonary tuberculosis.
- Recent NIPH Clinical Trials:Evaluation of effectiveness and clarification of the mechanism of high concentration hydrogen water intake on systemic inflammatory reaction syndrome
- Inhalation Risk:On loss of containment this substance can cause suffocation by lowering the oxygen content of the air in confined areas.
- Effects of Short Term Exposure:Asphyxiation. Exposure to cold gas could cause frostbite.
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Description
Hydrogen is colorless, odorless, tasteless,
flammable, and nontoxic. It exists as a gas at
ambient temperatures and atmospheric pressures.
It is the lightest gas known, with a density
approximately 0.07% that of air. Hydrogen is
present in the atmosphere occurring in concentrations of only about 0.5 ppm by volume at
lower altitudes.
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Physical properties
Hydrogen’s atom is the simplest of all the elements, and the major isotope (H-1) consists ofonly one proton in its nucleus and one electron in its K shell. The density of atomic hydrogenis 0.08988 g/l, and air’s density is 1.0 g/l (grams per liter). Its melting point is –255.34°C,and its boiling point is –252.87°C (absolute zero = –273.13°C or –459.4°F). Hydrogen hastwo oxidation states, +1 and –1.
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Uses
Hydrogen is an excellent reducing agent.Production of ammonia (NH3).Ethanol (ethyl alcohol made from grains).Hydrogenation of vegetable oils. Large quantities of hydrogen are produced on
site or pipelined for use by refineries, petrochemical
and bulk chemical facilities for hydrotreating,
catalytic reforming, and hydrocracking.
Smaller quantities of hydrogen are
produced on site or pipelined for use in the
chemical, metallurgical, fats and oils, glass, and
electronic industries.
Some of these smaller users have hydrogen
delivered to their manufacturing location as
gaseous hydrogen in cylinders or tube trailers,
or by cascade into on-site storage cylinders.
Certain smaller users have liquid hydrogen delivered
into an on-site liquid hydrogen storage
system. In oxy-hydrogen blowpipe (welding) and limelight; autogenous welding of steel and other metals; manufacture of ammonia, synthetic methanol, HCl, NH3; hydrogenation of oils, fats, naphthalene, phenol; in balloons and airships; in metallurgy to reduce oxides to metals; in petroleum refining; in thermonuclear reactions (ionizes to form protons, deuterons (D) or tritons (T)). liquid hydrogen used in bubble chambers to study subatomic particles; as a coolant.
