Atank contains 100 gallons of water and 50 oz of salt. water containing a salt solution of concentration 2 + sin t oz/gallon flows into the tank at a rate of 2 gal/min and the well mixed solution drains at the same rate. a. find the amount of salt in the tank at any given time. b. describe the behavior of the solution. is it periodic? what is its period, what is its amplitude?

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

How many valence electrons are in atom of radon?