Chemical bonds: An introduction - UK Essays.
Introduction. A chemical bond is an attraction between atoms brought about by a sharing of pair of electrons between to atoms or a complete transfer of electrons. There are three types of chemical bonds: Ionic, Covalent and Polar covalent. In addition chemists often recognize another type of bond called a hydrogen bond.
A hydrogen bond results when this strong positive charge density attracts a lone pair of electrons on another heteroatom, which becomes the hydrogen-bond acceptor. In DNA and protein structures, hydrogen bonds play a crucial role because the three dimensional structure of the helix is adopted by the proteins and nucleic bases.
Home — Essay Samples — Science — Biology — Structure and Function of Haemoglobin This essay has been submitted by a student. This is not an example of the work written by professional essay writers.
The importance of hydrogen bonds in living organisms Hydrogen bonds are of great importance throughout living organisms. They are weak and formed between hydrogen atoms and other atoms, normally oxygen, which are nevertheless cumulatively strong. An example of hydrogen bonds is between water molecules in the process of cohesion tension which.
Hydrogen Bond Definition. A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This bond always involves a hydrogen atom. Hydrogen bonds can occur between molecules or within parts of a single molecule. A hydrogen bond tends to be stronger.
Covalent bond vs. Hydrogen bond. As the name implies, a hydrogen bond is a chemical bond wherein hydrogen serves as a bridge between two atoms. Similar to a covalent bond, the hydrogen bond is a common chemical bond in organic compounds, particularly nucleic acids and proteins.
Hydrogen Bonding in Water. The best known example of hydrogen bonding is water: Every water molecule can be hydrogen bonded to as many as four other water molecules. In water at room temperature, the average number of hydrogen bonds per water molecule is 3.6.