Molecular Shape

What is the most likely shape of a molecule of Hydrazine, N₂H₄?

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Lycra is a polyurethane fibre used in the fashion industry. It is a polymer made from two monomers, one of which has the following formula:

O=C=N-(CH₂)_n-N=C=O

What is the O-C-N bond angle in this molecule?

• 90 °

• 109 °

• 120 °

• 180 °

The antidote molecule shown can help to prevent liver damage if someone takes too many paracetamol tablets.

What is the order of decreasing size of the bond angles x, y and z?

• x > y > z

• x > z > y

• y > z > x

• z > y > x

Sodium borohydride, NaBH₄, and boron trifluoride, BF₃, are compounds of boron. What are the shapes around boron in the boronhydride ion and in boron trifluoride?

• Boronhydride ion: square planar

  Boron trifluoride: pyramidal

• Boronhydride ion: square planar

  Boron trifluoride: trigonal planar

• Boronhydride ion: tetrahedral

  Boron trifluoride: pyramidal

• Boronhydride ion: tetrahedral

  Boron trifluoride: trigonal planar

Carbon disulfide, CS₂, is a volatile, flammable liquid which is produced in small quantities in volcanoes. Suggest the shape of the molecule and state the bond angle in ().

E.g octahedral (90)

A compound of fluorine and oxygen contains 3 atoms in each molecule. Suggest the shape of this molecule.

State the shape of the Beryllium Chloride, BeCl₂

State the shape of the tetrachloromethane molecule, CCl₄

Which molecule has a Trigonal Bipyramidal shape?

• NF₃

• CCl₄

• BH₄

• PF₅

What are the bond angles in PH₃ likely to be?

• 90°

• 107°

• 109°

• 120°