3. Even after twenty years of use most quarters have the same shiny appearance that they did when they were minted. Most pennies, however, have dulled considerably. What does this suggest about the position of the metal used to make quarters and the metal used to make pennies on the activity series? 4. Post 1982 pennies have a zinc core with a thin copper outer shell. Using your activity series predict what would happen if a post 1982 penny were put into a solution of hydrochloric acid?