6. shapes of molecules and intermolecular forces

Question 1

tetrahedral

Answer 1

no lone pairs
109.5

Question 2

pyramidal`

Answer 2

1 lone pair
107

Question 3

non linear

Answer 3

2 lone pair
104.5

Question 4

linear

Answer 4

180

Question 5

trigonal planar

Answer 5

120

Question 6

octahedral

Answer 6

90

Question 7

electronegativity

Answer 7

the attraction of a bonded atom for the pair of electrons in a covalent bond

Question 8

non polar bond/pure covalent bond

Answer 8

the bonded atoms are the same or the bonded atoms have the same or similar electronegativity

Question 9

polar bond/polar covalent bond

Answer 9

the bonded atoms are different and have different electronegativity

Question 10

london forces

Answer 10

weak intermolecular forces that exist between all molecules

Question 11

origin of induced dipoles

Answer 11

movement of electrons produces a changing dipole in a molecules
at any instant, an instantaneous dipole will exist, but its position is constantly shifting
the induced dipole induces further dipoles on neighbouring molecules, which then attract one another

Question 12

simple molecular lattice

Answer 12

molecules are held in place by weak intermolecular forces
the atoms within each molecule are bonded together strongly by covalent bonds

Question 13

properties of simple molecular substances

Answer 13

low melting and boiling point
can’t conduct electricity
non -polar simple molecular substance soluble in non-polar solvents

Question 14

anomalous properties of water

Answer 14

ice is less dense than water