Which property is characteristic of alkenes, alkynes, and aromatic hydrocarbons?
a. their vapor pressures decrease as their size increases.
b. their ph values are greater than 7.
c. their densities are lower than the density of water.
d. they are soluble in water.

Why is retrograde motion an apparent motion

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!