6.1 Shapes And Angles Of Molecules Flashcards
What is a lone pair?
A pair of unbonded electrons
What is the equation for lone pairs of electrons?
Total pairs minus bonded pairs
Why do pairs of electrons repulse?
They have the same charges
Which has a higher repulsion, lone pairs or bonded pairs?
Lone pairs
What is the molecule called if there are 3 bonds to an atom?
Trigonal Planar
What is a molecule called if there are 4 bonds to an atom?
Tetrahedral
What is a molecule called if there are 5 bonds to an atom?
Trigonal Bipyramidal
What is a molecule called if there are 6 bonds to an atom?
Octahedral
When drawing molecular geometry what do dashed lines and black triangles represent?
Black triangle = coming outwards
Dashed line = going inwards
What shape is a water molecule?
V shaped
Why is a water molecule not shaped linearly?
It has 2 lone pairs which means the repulsion between pairs increases to molecular angle causing a v shape
What is the angle of a molecule with 2 bonds?
180
What is a molecule called if it has 2 bonds
Linear
What is the angle of a molecule with 3 bonds?
120
What is the angle of a molecule with 4 bonds?
109.5
What are the angles of a molecule with 5 bonds?
90 and 120
What are the angles in a molecule with 6 bonds?
90
What is the angle of a v shaped water molecule?
104.5
If a molecule has 3 bonded pairs and 1 lone pair what are its angles? And what shape is it called?
107
Pyramidal
What is the anomaly with double bonds in terms of molecular angles?
There is none, they are counted the same as a normal bonded pair
What is the shape of BF3 and what are its angles?
Trigonal Planar
120
For every lone pair how much is the molecular angle reduced?
2.5
