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In chemistry, a double bond is a covalent bond between two atoms involving four bonding electrons as opposed to two in a single bond. Double bonds occur most commonly between two carbon atoms, for example in alkenes. Many double bonds exist between two different elements: for example, in a carbonyl group between a carbon atom and an oxygen atom.
A carbon–carbon bond is a covalent bond between two carbon atoms. [1] The most common form is the single bond: a bond composed of two electrons, one from each of the two atoms. The carbon–carbon single bond is a sigma bond and is formed between one hybridized orbital from each of the carbon atoms. In ethane, the orbitals are sp 3 ...
Perhaps the most ubiquitous domestic item of food storage is the fridge or fridge-freezer in which a wide variety of foodstuffs are contained and preserved through the use of low temperatures. Disposable food containers, a form of disposable food packaging, may be used for food or beverages. Disposable containers are often made of paper or ...
5300 W⋅m −1 ⋅K −1. Graphene (/ ˈɡræfiːn /) [1] is an allotrope of carbon consisting of a single layer of atoms arranged in a honeycomb nanostructure. [2][3] The name is derived from "graphite" and the suffix -ene, reflecting the fact that the graphite allotrope of carbon contains numerous double bonds in a two-dimensional sheet.
A Unitized Group Ration – Express self-heating field ration being heated in its box. Self-heating food packaging is active packaging with the ability to heat food contents without external heat sources or power, usually using an exothermic chemical reaction. Packets can also be self-cooling. These packages are useful for military operations ...
The classical example of this is bromination (any halogenation) of alkenes. [5] An anti addition reaction results in a trans-isomer of the products, as the substituents are on opposite faces of the bond. Depending on the substrate double bond, addition can have different effects on the molecule.
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