Discovered : by Henry Cavendish in 1766.
Isolated in London, UK.
Origin : The name is derived from the Greek ‘hydro genes’, meaning water forming.
Description :A colourless, odourless gas that burns and can form an explosive mixture with air. It is currently manufactured from methane gas, but is also produced by the electrolysis of water and aqueous salts. The gas is used to make such key materials as ammonia, cyclohexane and methanol, which are intermediates in the production of fertilisers, plastics and pharmaceuticals. Some see hydrogen gas as the clean fuel of the future - generated from water and returning to water when it is oxidised. Hydrogen-powered fuel cells are increasingly being seen as pollution-free sources of energy.
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The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types. The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The...
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In this paper I describe (theoretically) the method(s) of automated protein discovery and synthesis.
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A hypothetical gas that obeys exactly all postulates of the kinetic-molecular theory.
A gas filled tube which discharges electriaclly when ionizing radiation passes through it.
The ability of a substance to become permanently magnetized by exposure to an external magnetic field.
The spontaneous disintegration of atomic nuclei.
A very slightly soluble compound.
The unit used to express dipole moments.
Pair of electrons involved in a covalent bond.
A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.
Any kind of matter all specimens of which have the same chemical composition and physical properties.
Substances consisting largely of hydrocarbons, derived from decay of organic materials under geological conditions of high pressure and temperature (metamorphism) include coal, petroleum, natural gas, peat and oil shale. For further information see Fuel Chemistry
Two methyl groups of the same carbon atom.
Lewis Dot Formula (Electron Dot Formula)
Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.
The liquid and solid phases, phases in which particles interact strongly.
A thermometer used for accurate measurement of very small changes in temperature.
A reaction in which two atoms or groups of atoms are added to a molecule, one on each side of a double or triple bond. Types of addition reaction include electrophilic, nucleophilic (polar) and free radical addition (non-polar).
For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.
Amount of energy that must be absorbed by reactants in their ground states to reach the transition state so that a reaction can occur. In other words, activation energy is the minimum energy required for a chemical reaction to occur.
A group of atoms derived from an alkane by the removal of one hydrogen atom.
Regular periodic variations of properties of elements with atomic number (and position in the periodic table).
A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).