Answer: A form of precipitation requires melting and refreezing as they fall towards the ground.
Explanation: The hail begins as rain and freezes as it falls down to the surface.
Answer:
A meso compound is a non-optically active member of a set of stereoisomers, at least two of which are optically active.
Answer:
Crude oil is separated by fractional distillation. Crude oil is heated to vaporize the different hydrocarbons in a tank which is cool at the top and hot at the bottom. The vapours then rise and the different hydrocarbons condense at their specific boiling points, allowing them to be separated.
Lighter products, such as butane and other liquid petroleum gases (LPG), gasoline blending components, and naphtha, are recovered at the lowest temperatures. Mid-range products include jet fuel, kerosene, and distillates (such as home heating oil and diesel fuel).
