Shapes of molecules and intermoleclar forces

Flashcards by , created almost 6 years ago

Leaving Certificate Chemistry (Shapes of molecules and intermolecular forces) Flashcards on Shapes of molecules and intermoleclar forces, created by eimearkelly3 on 08/11/2013.

Created by eimearkelly3 almost 6 years ago
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Shapes of molecules and intermolecular forces
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Question Answer
What type of bonding forms molecules? Covalent bonds
What are the various shapes of molecules? Linear V-shaped Trigonal Planar Pyramidal Tetrahedral
What shape is a water molecule? V-shaped
Degrees between atoms in linear molecules 180 degrees
Degrees between atoms in a v-shaped molecule 104.5 degrees
Degrees between atoms in a trigonal planar molecule 120 degrees
Degrees between molecules in a pyramidal molecule 107 degrees
Degrees between atoms in a tetrahedral molecule 109.5 degrees
forces within an atom intramolecular forces
forces between molecules intermolecular forces
intermolecular forces van der waals dipole-dipole interactions hydrogen bonding
sequence of strength of repulsion ability lone pair:lone pair > lone pair:bonding pair > bonding pair:bonding pair
a polar molecule must be polar covalent not be symmetrical
how can polar molecules be non-polar overall? high degree of symmetry with a geometric centre
are intermolecular forces stronger or weaker than covalent bonds weaker
what effect do intermolecular forces have on boiling point the stronger the intermolecular forces, the higher the boiling point
van der waals forces weak attractive forces caused by the movement of electrons within a molecule
how do temporary dipoles form? Electrons move randomly within a bond so that at a particular point in time they may be nearer to one atom than the other which create temporary polarity.
permanent dipoles are formed between polar molecules where the positive end of one molecule is attracted to the positive end of another.
are permanent dipoles stronger or weaker than van der waals forces stronger
hydrogen bonding a special type of dipole-dipole interaction, which occurs when hydrogen id bonded to small electronegative atoms such as O, N or F
Van der Waals forces are named after Johannes Van der Waals