Structures

Question 1

Ionic compounds

Answer 1

• Ionic bonds between metals and nonmetals
  
  • Metals lose electrons, becoming positive, and vice versa
  • High melting points
  • Often soluble in water
  • Conduct electricity when dissolved or melted
  • E.g. Silver halides (photography)

Question 2

Metals

Answer 2

• High melting points
  
  • Good conductors
  • Hard, dense
  • Malleable
  • Ductile
  • Forms sea of delocalised electrons

Question 3

Giant covalent

Answer 3

• Covalent bonds form between nonmetals
  
  • Very high melting point
  • Insoluble
  • Insulators (except for graphite)
  • E.g. Diamond, graphite
  • Graphite only forms 3 bonds, forming layers that can slide and leaving free electrons

Question 4

Simple molecular

Answer 4

• Weak attractions between molecules
  
  • Low melting point
  • Insulators