In this lab we took a dull penny from before the year 1970 and changed its color to a shiny gold with the help of chemistry. First, we used a vinegar and salt mixture and scrubbed it onto the penny. This process cleaned all of the dark corrosion spots away and made the copper color shine like new, which then allowed us to have a clean surface to experiment on. This was mostly a physical change but their was a slight chemical reaction because of the acidity of the vinegar. We then heated granular zinc and zinc chloride solution with the penny in a dish on a hot plate until it boiled. We removed the penny with tongs and placed it in a beaker of water, immediately noticing the copper penny was now a bright, metallic silver. Visually it was clear
