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- Hydrogen | Properties, Uses, Facts | Britannica
Hydrogen, a colorless, odorless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements The earliest known chemical property of hydrogen is that it burns with oxygen to form water; indeed, the name hydrogen is derived from Greek words meaning ‘maker of water ’
- Hydrogen - Reactivity, Uses, Properties | Britannica
Hydrogen - Reactivity, Uses, Properties: One molecule of hydrogen dissociates into two atoms (H2 → 2H) when an energy equal to or greater than the dissociation energy (i e , the amount of energy required to break the bond that holds together the atoms in the molecule) is supplied The dissociation energy of molecular hydrogen is 104,000 calories per mole—written 104 kcal mole (mole: the
- Periodic table | Definition, Elements, Names, Symbols, Groups, Charges . . .
Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number When the elements are thus arranged, there is a recurring pattern in which elements in the same column (group) have similar properties
- Hydrogen - Isotopes, Deuterium, Tritium | Britannica
Corresponding compounds of the hydrogen isotopes differ slightly in their physical properties This difference is shown by the properties of the waters, listed in the Table, and of the elements, listed in the following Table The same is true of their chemical properties, both thermodynamic and kinetic
- Hydrogen bonding | Definition, Examples, Facts | Britannica
Hydrogen bonding, interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons; such a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces Hydrogen bonds can exist between atoms in different molecules or in the same molecule
- Water - Properties, Structure, Chemistry | Britannica
Water - Properties, Structure, Chemistry: Water has several important physical properties Although these properties are familiar because of the omnipresence of water, most of the physical properties of water are quite atypical Given the low molar mass of its constituent molecules, water has unusually large values of viscosity, surface tension, heat of vaporization, and entropy of
- Hydrogen chloride | Definition, Formula, Properties, Facts - Britannica
Hydrogen chloride, a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure Its chemical formula is HCl A solution of the gas in water is called hydrochloric acid Learn more about hydrogen chloride, including its properties
- Hydrogen - Fuel, Energy, Uses | Britannica
Hydrogen - Fuel, Energy, Uses: The most important industrial method for the production of hydrogen is the catalytic steam–hydrocarbon process, in which gaseous or vaporized hydrocarbons are treated with steam at high pressure over a nickel catalyst at 650°–950° C to produce carbon oxides and hydrogen: CnH2n+2 + nH2O → nCO + (2n + 1)H2; CnH2n+2 + 2nH2O→ nCO2 + (3n + 1)H2 The primary
- Hydrogen ion | Definition, Charge, Formula, Facts | Britannica
Hydrogen ion, strictly, the nucleus of a hydrogen atom separated from its accompanying electron The hydrogen nucleus is made up of a particle carrying a unit of positive electric charge, called a proton In common usage, the term hydrogen ion is used to refer to the hydrogen ion present in water solutions
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