Why isn't propyne call 1-propyne, but heptene is called 3-heptene

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number

What is the chemical name of the compound ti2o3?

Which is an example of a highly unstable isotope that is often used in fission reactions?