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Why are some molecules best represented by resonance structures?
Wiki User
∙ 9y ago
Rather hard to represent 3-d depictions of molecular structures on a 2-d surface short of folding the paper.
That's around all otherwise it is a simple and common way to depict chemical structures
Lewis dot Structures and Covalent bonds are completely different. The Lewis dot takes or gives, while covalent bonds share.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoA good example is SO2 molecule. The Lewis structure shows 1 O single bonded to the S atom and the other O double bonded to the S atom. A double bond is shorter than a single bond. But when the bond length is measured by microwave absorption, the bonds were idenical. I say the pair of electrons that Lewis thought formed the second pair of electrins in the double bond, are moving all over the SO2 molecule pulling the O atoms closer to the S atom than a single bond does
Wiki User
∙ 16y agothey illistrate lewis's structures because of their beauty and endurance through the times
Wiki User
∙ 15y agoBecause the bonding in a Lewis structure connot be correctly represented.
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What bond is within a molecule of S1O2?
The structure of SO2 is a hybrid made up from two resonance structures. The sulfur is the central atom, with one oxygen on each side in a linear formation. The two resonance structures have one double bond between the Sulfur and an Oxygen and the other bond as a single bond. ( O=S-O or O-S=O) In reality, the actual structure is a hybrid, in which the electrons that form the double bond move freely between each oxygen. The best way to show this is to write the structure with two single bonds, and add a dashed line above each of the double bonds. (O-S-O with dashed above). Each bond can be considered 1.5 in magnitude.
In chemistry what is a resonance?
A resonance structure is an alternate way of drawing a Lewis dot structure for a compound. For some molecules, there are multiple ways to draw a Lewis dot structure that still satisfy the rules (for instance, having the correct total electron count and satisfying the octet rule on each atom).Benzene is a classic example where a resonance structure is used. See the Web Links to the left for a diagram of benzene's two resonance structures. Note that in both cases, there are alternating double and single bonds between the six carbons. What changes in the two structures is which bonds are single and which are double bonds. In reality, all the bonds in benzene are identical. They are neither single nor double bonds, but something like a "one-and-a-half bond."There is a common misconception that in reality the molecule is somehow alternating between the two structures. It is not.. This is extremely important to understand! Resonance structures are simply a tool to make up for the fact that Lewis dot structures are not the best tool for describing bonding in molecules (they are very good, just not perfect!). Using resonance structures is a kind of band-aid to patch up this shortcoming of Lewis dot structures (for a better representation of bonding, you must use molecular orbital theory which requires quantum mechanics!).So if the is not alternating between the two structures, what's going on?! In fact the molecule's structure is always the same. The actual bonding the molecule is a mixture of the different resonance structures all the time. To see this, you have to look at the different structures and imagine blending them together to give one single structure which has contributions from each structure. So the bonds in benzene are not going back and forth being single and double bonds. Not at all! Not even really quickly. Instead the bonds are ALWAYS this average bond which is a bit of both single and double.Note also that not all resonance structures contribute equally to what the molecule really looks like. For benzene, there are two structures, and the real molecule is a perfect mixture of both structures, 50% each. However, the are some molecules for which you can draw more than a dozen structures! In this case, you might have one structure that is dominant, and the real molecule's structure is close to that, and the other structures only contribute a little bit. In other words, the real structure is a weighted average of all the different resonance structures, but the weighting for each structure depends on the details of that structure, and some have very little weighting.How do you tell what structures are more important that other ones? Only if the structures are identical by symmetry, like for benzene, do they contribute exactly the same amount. Another way to say this is that if you can convert between two structures just by rotating the drawing around, they are the same by symmetry. However, sometimes they are not the same at all. Here is how you tell. A better resonance structure has the following properties:-- bond is maximized-- formal charges are minimized-- negative formal charges are carried by the most electronegative atomsThere is no way to predict exactly how much each structure will contribute (except when two are equal by symmetry). But you can put them in order based on the three rules above (and they are listed in order of importance).
What is the best Lewis structure of CO in its best resonance form?
yes
Structure of benzene best described?
This is a tough question. Virtually every Organic chemistry teacher will say 2....the two Kekule resonance structures. However....that is incorrect. Benzene also has 4 other minor resonance forms. Mathematical calculations, as well as quantum mechanics have shown conclusively that benzene is not 2 sole resonance canonicals....but the Dewar structures as well. My proof is this....the bond order is not 1.5, as predicted....but rather 1.463. Hope this helps. Dr Jim Romano CEO Romano Scientific CEO Orgoman.com
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What is the difference between resonance and resonant frequency?
resonance is the behavior of resonant frequency while resonant frequency is the cause of it. There are basically two types of resonance; Electrical and Magnetic. Resonant frequency is that particular frequency for a system for which the system performs its best. while the system at that particular situation can be called the system at resonance
How many double bonds are present in the best resonance structure of the phosphate ion?
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