Checkpoint: metals at work

A solution of calcium oxide in water turns red litmus blue. What kind of oxide is it?

• Basic
• Neutral
• Acidic

Which metal can push copper out of copper sulphate solution?

• Zinc
• Gold
• Silver

Copper is put in dilute hydrochloric acid. What is seen?

• No bubbles
• A white solid
• Bubbles of hydrogen

How is sodium got from its molten ore?

• By electrolysis
• By heating it with carbon
• By roasting it in air

Iron is melted with a little carbon. What is the product called?

• An ore
• An alloy
• A mineral

Impure copper is refined by electrolysis. Which electrode is the impure copper?

• Both electrodes
• The anode
• The cathode