Final answer:
The bond formed between the oxygen of ethanol and a hydrogen of water is a hydrogen bond.
Step-by-step explanation:
The bond formed between the oxygen of ethanol and a hydrogen of water is a hydrogen bond. Hydrogen bonds are a type of intermolecular forces, where a hydrogen atom is attracted to a high electronegative atom such as oxygen or nitrogen. In the case of ethanol and water, the hydrogen atom of the water molecule is attracted to the oxygen atom of the ethanol molecule, resulting in a hydrogen bond.