Understanding Alkenes and Boiling Points

What is the general formula for alkenes?

• CₙH₂ₙ₊₂

• CₙH₂ₙ

• CₙH₂ₙ₋₂

• CH₄

What makes alkenes different from alkanes?

• They contain only single bonds

• They have a ring structure

• They contain at least one double bond

• They contain oxygen atoms

What happens to the boiling point of alkenes as the number of carbon atoms increases?

• It decreases

• It stays the same

• It increases

• It becomes zero

Why does the boiling point increase with longer carbon chains?

• Because shorter molecules are heavier

• Because longer molecules have stronger intermolecular forces

• Because the molecules evaporate faster

• Because electrons are lost

Which alkene would have the lowest boiling point?

• Ethene (C₂H₄)

• Butene (C₄H₈)

• Hexene (C₆H₁₂)

• Octene (C₈H₁₆)

If a student plotted a graph of number of carbon atoms vs. boiling point for alkenes, what kind of trend would they see?

• No trend

• Boiling point increases linearly

• Boiling point decreases randomly

• The trend forms a circle