Physical Properties of Alkanes

Why do alkane not dissolve in water?

• they are less dense than water
• they have low melting points
• they are non-polar compounds 
• they are chemically less reactive

The longer the hydrocarbon, the _______ the boiling point

• Lower
• Higher

The boiling points of alkane molecules increase as their molecular sizes increase.

• True

• False

Which of the following has the highest boiling point?

• heptane

• pentane

• nonane

As the number of carbons increases in an homologous series the melting point generally...

• increase
• decrease
• stay the same
• varies

Which of the following would have the highest melting point?

• C₃H₈
• C₄H₈
• C₅H₁₂
• C₂₂H₄₄

Hydrocarbon boiling points increase when branching increases.

• true

• false