Chaper 8 Trends in bonding and structure

Question 1

metallic bond

Answer 1

strong electrostatic attraction between metal cation (pos) and delocalised electrons

Question 2

what are elements immediately either side of the metal/non metal divide called

Answer 2

metaloids or semi metals

Question 3

physical properties of metals

Answer 3

conduct electricity when solid and molten, most have high melting and boiling points, are insoluble

Question 4

what is the boiling and melting point of aa metal based on and exception to high BP and mp

Answer 4

strength of metallic bonds, mercury is the exception

Question 5

Characteristics of simple molecular lattice

Answer 5

strong covalent bonds within the molecule
weak intermolecular forces between molecules

Question 6

which elements form giant covalent lattuces

Answer 6

boron, silicon and carbon

Question 7

what holds together the whole structure of a giant covalent lattice

Answer 7

strong covalent bonds

Question 8

structure and bonding of diamond

Answer 8

Carbon forms 4 covalent bonds, tetrahedral structure, 109.5 bond angles

Question 9

characteristics of diamond caused by strong covalent bonds throughout the whole structure

Answer 9

very hight melting g and boiling point
insoluble
doesnt conduct electricity

Question 10

structure and bonding of graphite

Answer 10

Carbon makes 3 covalent bonds, the remaining electron is delocalised.
Planar hexagonal layers, bond angle 120.
Layers are held together by London forces

Question 11

Characteristics of graphite

Answer 11

Very hight mp and bp
Insoluble
Conducts electricity due to delocalised electrons free to move over whole structure

Question 12

graphite structure, and characteristics

Answer 12

Single layer of graphene, same electrical conductivity as copper
Thinnest yet strongest material ever made