I need help with my chemistry hw (questions 3-7)

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Light waves can move through , but they travel fastest when they move through a(n) .

Asap at one point in history people could measure temperature by looking at the volume of a sample of gas. suppose a sample in a gas thermometer has a volume of 135ml at 11.0°c. indicate what temperature would correspond to each of the following volumes: 113 ml, and 155 ml.