definition of polar and non polar
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Definition of non-polar molecule Our online dictionary has non-polar molecule information from A Dictionary of Zoology dictionary.
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Answers:1) You can tell the polarity of the molecule through the lewis structure, by examining it's symetry. Tetrahedrals will always be symettrical, therefore, are non - polar. On the other hand, something like water, which is not symettrical, is polar. 2) you will know when u need a double / triple bond when either you dont not get the correct amount of electrons you came in with, or if the formal charges are obscure. Ozone for example. O3 has 18 electrons. 2 Oxygens bonded to a centrally bonded Oxygen If you put on oxygen in the middle, and single bond both of the other oxygens you have 6 electrons (dots) around one O, 6 dots around another, and 4 around the other. This is 16. Add the two bonds (2 electrons a piece = 4) and you have a total of 20 electrons - not the 18 you started with. You need to double bond one of the Oxygens to the central atom Oxygen. Then you have one Oxygen with 6 electrons (dots) around it, another with 4, and the Central oxygen with 2. 6 + 2 + 4 = 12 Now you have one single bond (2 electrons) and one double bond (4 electrons) 12 lone pair electrons + 6 bonded electrons = 18 electrons, the correct amount of electrons that you came into the problem with. Dont forget "resonance" structions. The double bond on one oxygen is shared between both of the outer oxygens. 3) London Dispersion are for non-polar molecules - It is a slight pull of electrons towards the more electronegative element. This type of intermolecular force is found in almost every molecule. Dipole - Dipole is when you have a mixture of polar molecules that all have a significant negative charge and positive charge. The positive charge of one molecule will allign itself with the negative charge of another molecule, and this process will go on and on for every molecule in the substance. Hydrogen bonding takes place in covelant bonds, when a HYDROGEN is bonded to a ELECTRONEGATIVE element with LONE PAIRS. Water, H20 O is electronegative with two lone pairs, and bonded to hydrogen. The lone pairs on anotoher water molecule are attracted to the hydrogens rich positive charge, as all of its negative charge was pulled away to the electronegative atom, in this case, oxygen. Hydrogen bonding is the strongest intermolecular force.
Answers:It is polar. That is part of the reason it mixes with water. It is also soluble with nonpolar substances like hydrocarbons because of the two methyl side groups.
Answers:Polarity occurs to a greater or lesser extent depending on the atoms involved. In teh cases you cite the double bond in acetone (the carbonyl group) is polar due to the electronegativity of oxygen compared to carbon. The same is true in the single C-O bond in isopropanol (the alcohol group) for the same reason.
Answers:1. non polar (soluble in oil) 2. polar (soluble in water) 3. amphipathic (both soluble in water and oil)