CF C4 Metals and Electrolysis

What is produced at the positive electrode when copper bromide solution is electrolysed?

• Bromine

• Hydrogen

• Oxygen

The extraction of aluminium is expensive because the process uses large amounts of ______

The diagram shows the extraction of ​ (a)  

​ (b)   gas is produced which reacts with the ​ (c)   electrodes to produce ​ (d)   gas

• Aluminium
• carbon
• carbon dioxide
• Oxygen

Some metal extraction is carried out in an inert atmosphere

Which gas is used for the inert atmosphere?

• argon

• chlorine

• hydrogen

Balance the equation for the reaction

• 1

• 2

• 4

• 8

What happens to the copper when copper oxide is heated with carbon?

• The copper is dissolved

• The copper is oxidised

• The copper is reduced

Metal D will be​ ​ (a)  

Metal E will be​ (b)  

• extracted by electrolysis of an ionic compound
• extracted by reduction with carbon
• extracted by reduction with hydrogen
• removed from the Earth as the metal itself

Copper chloride can conduct electricity when in solution or when ________

• gaseous

• molten

• solid

Where do the H+ and OH– ions come from in the electrolysis of copper chloride solution?

• Air

• Copper chloride

• Water

Which ion produces a metal?

• 
• 
• 
•