Why would the federal government and city government find it necessary regulate water standard?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?