Hi need the answer to these two questions ( take your time :> )

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

Why is the structure of molecule important to its function?