A student experiments with a bar magnet and paper clips. She places a paper clip on a table and moves it toward one of the magnetic poles of the magnet, measuring the point on the table at which the paper clip begins to move toward the magnet without her help. She repeats the experiment by moving the paper clip toward the other pole of the magnet, and then toward the center of the magnet. Her observations are shown.

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

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 .

Write a balanced equation showing the formation of copper (ii) nitrite from its elements