how do you know that a chemical has happened? A: A substance is mixed with water and forms a solution. B: The substance increases in temperature. C: The substance changes its state. D:A new substance forms. *It didn't say science so I put it as chemistry but its science sorry​

Part of molten rock at mid-ocean ridges

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4nh3 (g) + 5o2 (g) → 4no (g) + 6h2o (g) also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition: compound pressure at equilibrium nh3 65.1atm o2 31.3atm no 62.7atm h2o 65.8atm compound pressure at equilibrium nh3 65.3 atm o2 7.79 atm no 12.1 atm h2o 65.8 atm calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.