Submarines need to be extremely strong to withstand the extremely high pressure of
water pushing down on them. An experimental research submarine with a volume of
5,000 liters has an internal pressure of 1.6 atm. If the pressure of the ocean breaks the
submarine forming a bubble with a pressure of 155 atm pushing on it, how big will that
bubble be?

Compare and contrast physical changes with chemical changes.

Consider the story you just read. all but one of the choices below indicate that something is living.

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 .