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It removes oxidation or tarnish so the true metal is … Steel wool is a great abrasive cleaner for metals that are softer than it is, like copper, brass, silver, nickel, and other coin metals. According to Stu Haley, regional manager of Madison Heights, … Expert Answer 100% (2 ratings) When it comes time to decide whether to use graphite or copper electrodes in your shop, it's important to look at the big picture. The electrodes is always make contact with different chemicals, and some electron transfer processes always leading to some decomposition of the substrates. 1.Why is it important to clean the surface of the zinc and copper electrodes with 1 M HNO3 immeadiately before using them in this experiment. Investigating the electrolysis of aqueous solutions and electroplating. Pour some copper sulfate solution into a beaker. Cu 2+ at the negative electrode, copper ions gain electrons and form copper atoms; This process is used industrially to purify copper.