How did scientist discover that earths outer core is liquid

Drug abuse will not lead to physical and psychological dependence. true or false ?

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+

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 .