completion please

Complete each statement. 1. In a galvanic cell, the electrode where reduction occurs is known as the 2. In a zine-copper galvanic cell, the copper metal acts as the 3. The SI unit for electric potential difference is the 4. The most common form of corrosion prevention for steel in buried tanks and pipelines is called 5. The eloctrolysis of water produces 6. The fuels required for a bydrogen fuel cell to operate are and