Calculate the molar concentration of the polycyclic aromatic hydrocarbon ( PAH ), anthracene ( 178.23 g/mol), that was found in a well water sample at a concentration of 5.64 ppb. Assume the density of the well water sample is 1.00 g/mL.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso