To run for senate a candidate must be

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?

Why is a noble gas different from other elements

Hi , i am new here can anyone me out with this question why is space black after having so many shining objects like sun , moon , stars