Supersonic flight can cause molecules on the surface of an airplane to break
apart and chemically react. What additional challenges to flight does this
create?
O
A. The flight pattern can become erratic due to loss of thrust and
drag.
O
B. The airplane must have additional aerodynamic feat
of the added drag of having new molecules.
C. This causes a lot of heat that the airplane must be shielded from.
O
D. This can cause sonic booms that can damage building structures.

Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)

Me as soon as possible! me as soon as possible!

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