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Crash Course (sometimes stylized as CrashCourse) is an educational YouTube channel started by John Green and Hank Green (collectively the Green brothers), who became known on YouTube through their Vlogbrothers channel. [2] [3] [4] Crash Course was one of the hundred initial channels funded by YouTube's $100 million original channel initiative.
The length of the carbonhydrogen bond varies slightly with the hybridisation of the carbon atom. A bond between a hydrogen atom and an sp 2 hybridised carbon atom is about 0.6% shorter than between hydrogen and sp 3 hybridised carbon. A bond between hydrogen and sp hybridised carbon is shorter still, about 3% shorter than sp 3 C-H.
Consequently, hydrogen bonds between or within solute molecules dissolved in water are almost always unfavorable relative to hydrogen bonds between water and the donors and acceptors for hydrogen bonds on those solutes. [44] Hydrogen bonds between water molecules have an average lifetime of 10 −11 seconds, or 10 picoseconds. [45]
This is an accepted version of this page This is the latest accepted revision, reviewed on 5 December 2024. American vlogger and entrepreneur (born 1980) This article is about the American vlogger and entrepreneur. For other people named Henry or Hank Green, see Henry Green (disambiguation). Hank Green Green in 2023 Born William Henry Green II (1980-05-05) May 5, 1980 (age 44) Birmingham ...
Huggins believed that he had been the first to suggest the concept of the hydrogen bond, while he was a student under G. N. Lewis at the Chemical Laboratory of the University of California, Berkeley. According to his account, he wrote a thesis in 1919 in which the H-bond was introduced and applied to tautomerism in acetoacetic acid ...
Other mechanistic possibilities not involving direct C–H bond cleavage by the metal include (i) generation of arylmetal species by electrophilic aromatic substitution mechanism (common for electrophilic Pd, Pt, Au, Hg species), (ii) cleavage of the C–H bond via hydrogen atom abstraction by an O- or N-centered radical, which may then go on ...
A nonane molecule, consisting of nine carbon atoms in a chain with 20 hydrogen atoms surrounding it. In chemistry, catenation is the bonding of atoms of the same element into a series, called a chain. [1] A chain or a ring may be open if its ends are not bonded to each other (an open-chain compound), or closed if they are bonded in a ring (a ...
2 O, the 2s orbital of oxygen is mixed with the premixed hydrogen orbitals, forming a new bonding (2a 1) and antibonding orbital (4a 1). Similarly, the 2p orbital (b 1) and the other premixed hydrogen 1s orbitals (b 1) are mixed to make bonding orbital 1b 1 and antibonding orbital 2b 1. The two remaining 2p orbitals are unmixed.