164028
Description
Flashcards by eimearkelly3, updated more than 1 year ago
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Created by eimearkelly3
over 10 years ago
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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 |
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