1. In covalent molecules such as methane, the bonding is due __________ to between ____________ so that __________________ .
2. Galvanic corrosion involves a _________________reaction at the ________________ and a ______________ reaction at the ______________________________________.
3. Metals and polymers do/do not (circle one) interact with their environment. In the case of metals this may occur as ___________or __________________ .