Molecular shapes, formulae; link macro–micro: Practice Questions

• a.

  Diamond consists of discrete molecules, whereas graphite is a giant structure.

• b.

  Carbon atoms in diamond are heavier than those in graphite.

• c.

  Diamond has a rigid 3D giant covalent structure, while graphite has a layered structure with weak intermolecular forces between layers.

• d.

  Diamond has a giant ionic structure, while graphite has a giant covalent structure.

• a.

  Ice contains air bubbles trapped during freezing.

• b.

  Water molecules in ice have more kinetic energy.

• c.

  Hydrogen bonding in ice creates an open cage-like structure.

• d.

  The covalent bonds within water molecules lengthen when ice forms.

• a.

  The F-S-F bond angle between the two equatorial fluorine atoms is exactly \(120^{\circ}\).

• b.

  The molecular shape of \(SF_4\) is described as 'seesaw'.

• c.

  \(SF_4\) is a polar molecule.

• d.

  The central sulfur atom has five electron domains around it.

• a.

  Bromine, because it has more electrons than hydrogen.

• b.

  Bromine, because it is more electronegative than hydrogen.

• c.

  Hydrogen, because it is more electronegative than bromine.

• d.

  Hydrogen, because it is less electronegative than bromine.

• a.

  The central phosphorus atom obeys the octet rule.

• b.

  It has a tetrahedral shape and is a non-polar molecule.

• c.

  It has a trigonal bipyramidal shape and is a non-polar molecule.

• d.

  It has a trigonal bipyramidal shape and is a polar molecule.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.