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hydrogen bond: Definition from Answers.com
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Because of the small size of hydrogen relative to other atoms and molecules, the resulting charge, though only partial, represents a large charge density. When more molecules are present, as is the case of liquid water, more bonds are possible because the oxygen of one water molecule has two lone pairs of electrons, each of which can form a hydrogen bond with a hydrogen on another water molecule
Bond - definition of Bond by the Free Online Dictionary, Thesaurus and Encyclopedia.
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A certificate of debt issued by a government or corporation guaranteeing payment of the original investment plus interest by a specified future date.11. An insurance contract in which an agency guarantees payment to an employer in the event of unforeseen financial loss through the actions of an employee.13
CHEMTUTOR COMPOUNDS
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Molecules made with Group 2 elements that have two attached items to the Group 2 element have a linear shape, because the two attached materials will try to move as far from each other as possible. NOCl, is a molecule with nitrogen in the center (See how to write Lewis structures above.) and an oxygen and a chlorine atom attached to the central nitrogen
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Fluorine, chlorine, bromine and iodine all have the same type of Lewis structure, with seven outer electrons (2 on the right side, 2 on the top, 2 on the left side, and 1 on the bottom, so two F atoms share their unpaired electrons with each other to form the single covalent bond, F:F or F-F, to get F2. The number of paired and unpaired electrons around an atom play an important part in determining the shape of a molecule, which in turn contribute to chemical and physical properties of the molecule
The Covalent Bond
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Nonpolar and Polar Covalent Bonds In molecules such as H2, Cl2, and N2, the electron density (the probability of finding the valence electrons in a given area) is equally divided between the two bonded atoms. A covalent bond in which electrons are shared unequally is called a polar covalent bond; one atom acquires a partial negative charge (d -) and the other acquires a partial positive charge (d +)
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Polar covalent bonds often indicate polar molecules, which are likely to bond with other polar molecules but are unlikely to bond with non-polar molecules. There are several different kinds of bonds; the type of bond seen in elements and compounds depends on the chemical properties as well as the attractive forces governing the atoms and molecules
How can you tell the difference between covalent bonds and ionic bonds? - Yahoo! Answers
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The nonmetals (do not include non-reactive noble gasesin the last column on the right) are located in the upper right hand corner of the periodic table. To summarize, a bond between a metal and a nonmetal results in electrons being transferred from the metal to the nonmetal, each becoming a positive, and a negative ion respectively
http://www.diffen.com/difference/Covalent_Bonds_vs_Ionic_Bonds Competition: low
Ionic bond, also known as electrovalent bond is a type of bond formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Melting point: low High Examples: Methane (CH4), Hydro Chloric acid (HCl) Sodium chloride (NaCl), Sulphuric Acid (H2SO4 ) Occurs between: Two non-metals One metal and one non-metal Boiling point: Low High State at room temperature: Liquid or gaseous Solid Contents 1 About Covalent and Ionic Bonds 2 Formation and examples 2.1 Examples (video) 3 Characteristics of the bonds 4 Video comparing types of atomic bonds 5 Further Reading 6 See Also 7 References About Covalent and Ionic Bonds The covalent bond is formed when two atoms are able to share electrons whereas the ionic bond is formed when the "sharing" is so unequal that an electron from atom A is completely lost to atom B, resulting in a pair of ions
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Above 0oC (evaporation), and particularly at 100oC (boiling), the intermolecular forces are weak enough for 'intact water molecules' to escape from the surface of the liquid water. In the reverse process, when ice is warmed, the intermolecular forces are weakened and at 0oC the intermolecular bonds are weakened enough to allow melting to take place
Covalent Bonds - Molecular Cell Biology - NCBI Bookshelf
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(In an alternative form, called the boat, both carbon 1 and carbon 4 lie above the plane (more...)The L isomers of sugars are virtually unknown in biological systems except for L-fucose. Rather, sugar molecules adopt a conformation in which each of the ring carbons is at the center of a tetrahedron, just like the carbon in methane (see Figure 2-2)
hydrogen bond: Definition from Answers.com
Because of the small size of hydrogen relative to other atoms and molecules, the resulting charge, though only partial, represents a large charge density. When more molecules are present, as is the case of liquid water, more bonds are possible because the oxygen of one water molecule has two lone pairs of electrons, each of which can form a hydrogen bond with a hydrogen on another water molecule
Bond - definition of Bond by the Free Online Dictionary, Thesaurus and Encyclopedia.
A certificate of debt issued by a government or corporation guaranteeing payment of the original investment plus interest by a specified future date.11. An insurance contract in which an agency guarantees payment to an employer in the event of unforeseen financial loss through the actions of an employee.13
CHEMTUTOR COMPOUNDS
Molecules made with Group 2 elements that have two attached items to the Group 2 element have a linear shape, because the two attached materials will try to move as far from each other as possible. NOCl, is a molecule with nitrogen in the center (See how to write Lewis structures above.) and an oxygen and a chlorine atom attached to the central nitrogen
Fluorine, chlorine, bromine and iodine all have the same type of Lewis structure, with seven outer electrons (2 on the right side, 2 on the top, 2 on the left side, and 1 on the bottom, so two F atoms share their unpaired electrons with each other to form the single covalent bond, F:F or F-F, to get F2. The number of paired and unpaired electrons around an atom play an important part in determining the shape of a molecule, which in turn contribute to chemical and physical properties of the molecule
The Covalent Bond
Nonpolar and Polar Covalent Bonds In molecules such as H2, Cl2, and N2, the electron density (the probability of finding the valence electrons in a given area) is equally divided between the two bonded atoms. A covalent bond in which electrons are shared unequally is called a polar covalent bond; one atom acquires a partial negative charge (d -) and the other acquires a partial positive charge (d +)
Polar covalent bonds often indicate polar molecules, which are likely to bond with other polar molecules but are unlikely to bond with non-polar molecules. There are several different kinds of bonds; the type of bond seen in elements and compounds depends on the chemical properties as well as the attractive forces governing the atoms and molecules
How can you tell the difference between covalent bonds and ionic bonds? - Yahoo! Answers
The nonmetals (do not include non-reactive noble gasesin the last column on the right) are located in the upper right hand corner of the periodic table. To summarize, a bond between a metal and a nonmetal results in electrons being transferred from the metal to the nonmetal, each becoming a positive, and a negative ion respectively
Ionic bond, also known as electrovalent bond is a type of bond formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Melting point: low High Examples: Methane (CH4), Hydro Chloric acid (HCl) Sodium chloride (NaCl), Sulphuric Acid (H2SO4 ) Occurs between: Two non-metals One metal and one non-metal Boiling point: Low High State at room temperature: Liquid or gaseous Solid Contents 1 About Covalent and Ionic Bonds 2 Formation and examples 2.1 Examples (video) 3 Characteristics of the bonds 4 Video comparing types of atomic bonds 5 Further Reading 6 See Also 7 References About Covalent and Ionic Bonds The covalent bond is formed when two atoms are able to share electrons whereas the ionic bond is formed when the "sharing" is so unequal that an electron from atom A is completely lost to atom B, resulting in a pair of ions
Above 0oC (evaporation), and particularly at 100oC (boiling), the intermolecular forces are weak enough for 'intact water molecules' to escape from the surface of the liquid water. In the reverse process, when ice is warmed, the intermolecular forces are weakened and at 0oC the intermolecular bonds are weakened enough to allow melting to take place
Covalent Bonds - Molecular Cell Biology - NCBI Bookshelf
(In an alternative form, called the boat, both carbon 1 and carbon 4 lie above the plane (more...)The L isomers of sugars are virtually unknown in biological systems except for L-fucose. Rather, sugar molecules adopt a conformation in which each of the ring carbons is at the center of a tetrahedron, just like the carbon in methane (see Figure 2-2)
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