Some distilled water is added to an empty beaker. A gram of copper (II) nitrate is added to the beaker and while the water is being stirred. After a few minutes, what is in the beaker?
a) solid copper, nitrate ions, and water
b) copper ions, nitrate ions, and water
c) nitrogen gas, copper atoms, electrons, and water
d) solid copper (II), nitrate, and water
Answer: b) copper ions, nitrate ions, and water