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level: Level 1 of Shapes of molecules and IMF

Questions and Answers List

level questions: Level 1 of Shapes of molecules and IMF

QuestionAnswer
Electron pair repulsion theory statesnegative charge - repulsion The electrons surrounding the central atom determine the shape of the molecules. As they repel they are arranged as far apart as possible so the arrangement lowers repulsion
Tetrahedral4bonding regions 109.5 degrees
Pyramidal3 bonding regions 1 lone pair 107 degrees
Non linear2 bonding regions 2 lone pairs 104.5 degrees
Linear2 bonding region 180 degrees
Triagonal planar3 bonding regions 120 degrees
Octahedral6 bonding regions 90 degrees
Electronegativity definitionThe attraction of a bonded atom for the pair of electron in a covalent bond
Factors affecting electroegatvity- The nuclear charges are different - The atoms may be different sizes -The shared pair of electrons may be closer to nucleus than the other
ELECTRONEGATIVITY DIFFERENCE 0=COVALENT
EN DIFFERENCE +1.8 =IONIC
AN ELECTRONEGATIVITY DIFF BETWEEN 0-1.8=POLAR COVALENT
Non polar bonds termsbonded atoms are the same or same or siimiliar electronegativity
delta + and delta - are givenlarger e neg gets delta - smaller e neg gets delta +
Which molecules have an overall dipolenon-symmetrical molecules so polar molecules have a dipole overall eg. pyramidal and non linear
Polar covalent bond definitionShared paired of electrons where the electron is not shared equally so e neg difference
Dipole definitionCharged separation across a bond with one atom having a delta + charge and one item with delta - charge