Which type of bond is formed between magnesium and oxygen? a. ionic b. metallic c. polar covalent d. nonpolar covalent

What overall charge must all compounds have

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 .

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion