Ozone located in the troposphere is . a. considered a pollutant b. beneficial to living organisms c. higher in concentration than ozone in the stratosphere d. all of the above

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work