Group 1
Q:How many lone pairs on NH3 molecule?
A: 1
What does vsepr stand for?
Valence shell electron pair repulsion.
Q:What is the angle between a tetrahedral shape?
A: 109.5
Q: Rank the strength of lone pair and bonding pair interactions.
A: lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair
Q: what is the shape of CH4?
A: tetrahedron
Q: Give an example of a trigonalplanar molecule?
A: BF3
What is the bond angle in ammonium?
109.5 degrees
Q: Why is lone pair - lone pair strongest repulsion?
A: It is the most electronegative (no electrons are shared unlike bonded pairs)
Are the shapes of BH3 and CH3- the same or different?
A: different
Q. what molecule is bent shape
h2o
Q: What is an example of an octahedral molecule
A: SF6
Why do lone pairs have the most repulsive force, lone-pair/bonds second most, bond bond the least?
Because of the magnitude of the effective charges - like repels like so the Coulomb force is highest repulsion.
Q: Why is H2O bent?
A: Because it has 2 lone pairs that repel each other.
Q: Predict the shape of a molecule with 5 bonds and no lone pairs. Explain your prediction.
A: Trigonal bipyramidal. This shape allows the bonds to be furthest from each other.
Q Why does [SeCl6]2- adopt a regular octahedral shape when we would normally expect a distorted shape?
A the lone pair is steriochemically inert