1) Which element is copper ore heated with to extract the copper? a) Silicon b) Nitrogen c) Carbon d) Oxygen 2) The removal of oxygen is known as... a) Oxidation b) Reduction c) Oxygen theft 3) How is copper purified? a) Electrolysis b) Evaporation c) Solution Mining 4) The positive electrode is called the... a) Anode b) Cathode 5) What is the main metal in amalgam? a) Lead b) Tin c) Iron d) Mercury 6) How is solder used? a) In fillings for teeth b) To complete electrical circuits c) In musical instruments 7) Which of these is a smart alloy? a) Nitinol b) Lead c) Carbon d) Brass 8) Which of these is not an alloy? a) Brass b) Solder c) Iron d) Amalgam 9) At the cathode... a) ions lose electrons b) ions gain electrons 10) Which of these is a reason to recycle? a) It is really difficult to do b) It requires more energy c) It saves natural resources d) It uses more natural resources

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