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Copper is a ductile and malleable base metal that is valued for its high thermal and electrical conductivity. Easily identifiable because of its iridescent, golden red color, copper and its alloys, have been used by humans for thousands of years.
Brass is a common useful metal. Here's a look at what brass is made of and information about its chemistry. Answer: Brass is an alloy made primarily of copper and zinc. The proportions of the copper and zinc are varied to yield many different kinds of brass. Basic modern brass is 67% copper and 33% zinc. Lead commonly is added to brass at a concentration of around 2%. The lead addition improves the machinability of brass.