Earth's thin outer shell is broken into big pieces. What are these pieces called?

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.

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.