4.1.2 Alkanes

Question 1

alkanes are a homologous series of saturated hydrocarbons with the general formula:

Answer 1

CnH2n+2

Question 2

general formula of a cycloalkane+alkene

Answer 2

CnH2n

Question 3

alkanes are made up of sigma bonds
what are they?

Answer 3

a bond formed by the lengthways overlap of orbitals directly between two bonding atoms

Question 4

alkanes form a tetrahedral structure.
the bond angle about any carbon in any alkane is 109.5. using electron pair repulsion theory, explain why it is this bond angle?

Answer 4

there are 4 bonding pairs of electrons and no lone pairs. the BP repel equally.

Question 5

how does the the boiling point change with the number of carbon atoms present?

Answer 5

as the boiling point increases, the no of carbon atoms increase