Question

how did this molecule form? a hydrogen molecule bonded with an oh- molecule. two water molecules bonded. a water molecule gained an hydrogen ion from another water molecule. a water molecule split in half. evaporation.

Explanation:

The molecule shown is a hydronium ion ($H_3O^+$). It forms when a water molecule ($H_2O$) gains a hydrogen ion ($H^+$) from another water molecule in the auto - ionization of water process.

Answer:

C. A water molecule gained an hydrogen ion from another water molecule.