Shapes Of Mol/ Ions Flashcards
Check notes for diagrams etc
What is a bonding pair?
Pair of e shared between 2 atoms
What is a lone pair?
Pair of unshared e in outer shell of an atom
State the lp-bp strengths
Lp-Lp> Lp-Bp> Bp-Bp
Why is BeCl2 linear?
2 bps of e repel each other equally and mol take up this shape to minimise repulsions
Why is BF3 trigonal planar?
3 bps of e repel each other equally and mol takes up its shape to min repulsions
What shape is BeCl2?
Linear
What shape is BF3?
Trigonal Planar
What shape is CH4?
Tetrahedral
Why is CH4 tetrahedral?
4bps e repel each other equally and molecule takes up this shape to min repulsions
What shape is CO2?
Linear
What shape is PF5?
Trigonal Bipyramid
Why is PF5 trig bipyr?
5 bps of e repel each other equally and mol takes up this shape to min repulsions
What shape is SF6?
Octahedral
Why is SF6 octrahedral?
Six bp e repel each other equally and mol takes up this shape to min repulsions
What is the bond angle and shape of NH3?
107 degrees and Pyramidal
Why is NH3 pyramidal?
3 bps and 1 lp- lp > rep than bp and mol takes up this shape to minimise repulsions
What is the shape and bond angle of H20?
104.5 degrees and Bent
Why is water a bent shape?
2bp e and 2 lp, lp> rep bp and mol takes up this shape to min repulsions
What is the shape and bond angle of NH4?
Tetrahedral and 109.5 degress
Why is NH4 a tetrahedral shape?
4 bps e repel each other and equally and ion takes up this shape to minimise repulsions
What shape is ClF3?
T-shaped and 86 degrees
Why is BF3 T shaped?
3 bps and 2 lps- lp>repulsion than bp- mol takes up shape to min repulsions
