Chemistry B: Properties and Uses of Unsaturated Hyrdocarbons

Use the drop-down menus to answer the questions. What would be a reasonable value for the vapor pressure of 1-heptene at 100°C?

800 mm Hg

Name each of the three types of unsaturated hydrocarbons, summarize their structural differences, and give an everyday source of each.

The three types of unsaturated hydrocarbons are alkenes, alkynes, and aromatic hydrocarbons. Alkenes contain at least one double bond, alkynes contain at least one triple bond, and aromatic hydrocarbons contain one or more benzene rings. Sources of alkenes include margarine and rubber; a source of alkyne is acetylene fuel in welding torches; and sources of aromatic hydrocarbons are polystyrene and aspirin.

Select the structure corresponding to trans-3-octene.

b

Identify the graph at right that best represents the trend in alkyne boiling point as a function of carbon chain length.

graph a

Identify the graph that best represents the trend in alkene boiling point as a function of carbon chain length.

graph a

Use the drop-down menus to answer the questions. Where would the points for 1-pentene be expected to fall?

to left of black points