Chemistry 2.2.8: Structures Of Covalent Bonds

Question 1

what are the two types of covalent structures?

Answer 1

simple molecular lattice
giant covalent lattice

Question 2

what are simple molecular structures?

Answer 2

structures made of small molecules such as Ne, H2, O2

Question 3

how are the atoms and molecules held together in a simple molecular structure?

Answer 3

atoms within a molecule are held together by strong covalent bonds.
different molecules are held together by weak intermolecular forces (e.g van Der Waals or London forces)

Question 4

what are the properties of simple molecular structures?

Answer 4

• they have a low melting and boiling pint due to the weak intermolecular forces
• cannot conduct electricity as there are no free particles
• soluble in non-polar solvents (e.g hexane) due to London forces forming between molecules and the solvent allowing it to dissolve

Question 5

examples of giant covalent structures

Answer 5

graphite, diamond and SiO2

Question 6

properties of giant covalent structures

Answer 6

• have high melting and boiling points due to strong covalent bonds
• non-conductors of electricity except for graphite
• insoluble in both polar and non-polar solvents as they are too strong