Cao can be used as a drying agent. one such application occurs when water is added to dry concrete or cement. the reaction that occurs is

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

When the mercury level in a barometer decreases that atmospheric pressure has

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .