20 POINTS AND GIVING BRAINSLET AND THANKS IF ITS CORRECT. please help this is very urgent :( don’t troll I actually need help with this this is due in 5 minutes

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2