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hydrogen bond in water

hydrogen bond in dna

intermolecular hydrogen bonding

intermolecular forces

properties of hydrogen bond

intramolecular hydrogen bonding

hydrogen bond strength

types of hydrogen bonding

These are the secondary structures in proteins. These secondary structures are held together by hydrogen bonds. These form as shown in the diagram between one of the lone pairs on an oxygen atom and the hydrogen attached to a nitrogen atom: Although the hydrogen bonds are always between C="O" and H-N groups,
17 Jan 2017 A hydrogen bond is a weak type of force that forms a special type of dipole-dipole attraction which occurs when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons. These bonds are generally stronger than ordinary
A description of van der Waals forces (temporary fluctuating dipole and dipole-dipole interactions) causing attractions between individual molecules. Hydrogen bonding . . . An explanation of how hydrogen bonding arises and its effect on boiling points. Bonding in organic compounds . . . This leads you to the bonding menu
Chemguide – answers. HYDROGEN BONDING. 1. a) From HCl to HBr to HI, the halogen atom is getting bigger with more electrons. That increases the size of the temporary fluctuating dipoles which cause van der Waals dispersion forces. That makes the attractions between neighbouring molecules stronger, and so more
This statement is about the effect of hydrogen bonding on the physical properties of a compound in which hydrogen bonds are present. Before you go on, you should find and read the statement in your copy of the syllabus. First, re-read the Chemguide page about hydrogen bonding, revising hydrogen bonding, but mainly
INTERMOLECULAR BONDING - VAN DER WAALS FORCES. This page explains the origin of the two weaker forms of intermolecular attractions - van der Waals dispersion forces and dipole-dipole attractions. If you are also interested in hydrogen bonding there is a link at the bottom of the page. What are intermolecular
Chemguide – questions. HYDROGEN BONDING. Important: These questions will also expect you to know about van der Waals forces. 1. The boiling points of the hydrogen halides are: HF. HCl. HBr. HI boiling point (K). 293. 188. 206. 238 a) Explain why the boiling points increase from HCl through HBr to HI. b) The boiling
INTERMOLECULAR BONDING - HYDROGEN BONDS. This page explains the origin of hydrogen bonding - a relatively strong form of intermolecular attraction. If you are also interested in the weaker intermolecular forces (van der Waals dispersion forces and dipole-dipole interactions), there is a link at the bottom of the
MOLECULAR STRUCTURES. This page describes how the physical properties of substances having molecular structures varies with the type of intermolecular attractions - hydrogen bonding or van der Waals forces.
Hydrogen bonds are much stronger than these and therefore it takes more energy to separate alcohol molecules than it does to separate alkane molecules. That's the main reason that the boiling points are higher. The effect of van der Waals forces . . . . . . on the boiling points of the alcohols: Hydrogen bonding isn't the only

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March 2018