What causes a liquid to change into vapor

Which of these conditions most likely produces an unstable isotope?

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form