1.Which of the following pairs can NOT form an ionic compound? carbon and oxygen

sodium and oxygen

magnesium and sulfur

Which best describes how johannes kepler developed his laws of planetary motion

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

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 .