Imagine the tetrahedron of a carbon atom. Water looks similar to this. Two of the corners are bonded to a hydrogen atom (one each) and the other two are unshared pairs of electrons. The repulsion of the two unshared pairs causes the angle between the O-H bonds of the other two to have an angle of 105 degrees. The shape is described as "bent."
2007-03-18 00:48:22
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answer #1
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answered by physandchemteach 7
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Molecular geometry or molecular structure is the three-dimensional arrangement of the atoms that constitute a molecule, inferred from the spectroscopic studies of the compound. It determines several properties of a substance including its reactivity, polarity, phase of matter, color, magnetism, and biological activity.
Molecular geometries are best determined at temperatures close to absolute zero because at higher temperatures the molecules will show considerable rotational motion. In the solid state the molecular geometry can be measured by X-ray crystallography. Geometries can be computed by quantum mechanical calculations or by semi-empirical molecular modeling. Larger molecules often exist in multiple stable chemical conformations that differ in their molecular geometry and are separated by high hills in the potential energy surface.
The position of each atom is determined by the nature of the chemical bonds by which it is connected to its neighboring atoms. The molecular geometry can be described by the positions of these atoms in space, evoking bond lengths of two joined atoms, bond angles of three connected atoms, and torsion angles of three consecutive bonds.
O
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H H
WATER H2O
Molecules, by definition, are most often held together with covalent bonds involving single, double, and/or triple bonds, where a "bond" is a shared pair of electrons (the other method of bonding between atoms is called ionic bonding and involves a positive cation and a negative anion).
Molecular geometries can be specified in terms of bond lengths, bond angles and torsional angles. The bond length is defined to be the average distance between the centers of two atoms bonded together in any given molecule. A bond angle is the angle formed by three atoms bonded together. For four atoms bonded together in a straight chain, the torsional angle is the angle between the plane formed by the first three atoms and the plane formed by the last three atoms.
Molecular geometry is determined by the quantum mechanical behaviour of the electrons. Using the valence bond approximation this can be understood by the type of bonds between the atoms that make up the molecule. Before atoms interact to form a chemical bond, the atomic orbitals mix in a process called orbital hybridisation.The two most common types of bonds are Sigma bonds and Pi bonds. The geometry can also be understood by molecular orbital theory where the electrons are delocalised.
....all the best.
2007-03-18 08:33:51
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answer #2
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answered by popcandy 4
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Water molecule has a bent or 'V' shape. water consists of 2 lone pairs of electron and 2 bonded pairs(used for bondind between oxygen and hydrogen atoms) the force of repulsion between a lone pair of electron and a bonded pair is larger than that between 2 bonded pairs of electrons. therefore the lone pairs of electron on oxygen atom will have a bent shape such that the repulsion between the bonds are minimized.
2007-03-18 08:03:45
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answer #3
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answered by Rishi 1
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Angle between two H is 109.3 deg. Oxygen shar its teo free electrons with hydrogen to make bond ...water molecule gets form.
O
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H H
2007-03-18 19:28:02
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answer #4
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answered by handsom_from_pune 2
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the acutal scientific name of this structure is:
bent
2007-03-18 10:29:52
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answer #5
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answered by blueboy3056 3
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nerdg
2007-03-18 07:47:45
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answer #6
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answered by Anonymous
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