Topic 5 - Electrolysis (Year 10) Flashcards
What is the name given to the negative electrode in elecotrolysis?
Cathode
What is the name given to the positive electrode in elecotrolysis?
Anode
What is an electrolyte?
Solution of ions that can conduct electricity
What term can be used to remember which elctrode has which charge?
PANIC (Positive Anode Negative Is Cathode)
Which Electrode would a Pb2+ ion move towards in the electrolysis of molton lead bromide?
Negative
What type of electrodes are used in electrolysis?
Two inert, carbon electrodes
Define electrolysis
The spliiting up of an ionic compound into it’s constituent elements usinng electricity
What would be produced at the negative electrode in the electrolysis od NaCl?
Na (Sodium)
What would be produced at the positive electrode in the electrolysis od NaCl?
Cl2 (Chlorine)
Describe how the electrolysis of a molten ionic substance is carried out in a lab
Two inert electrodes are cleaned using sand paper. The ionic compound is heated in a crucible over a bunsen burner. The electrodes are placed into the electrolyte and connected to a power source.
Give the half equation for the reduction of K+ ions during the electrolysis of KCl
K+ + e- → K
Give the half equation for the oxidation of Cl- ions during the electrolysis of KCl
2Cl- → Cl2 + 2e-
Give the name of the ions produced when water molecules are broken down
H+ and OH- (Hydrogen ion and Hydroxide Ion)
Can ionic substances be electrolysed when solid?
No
Why can’t ionic substances be electrolysed when solid?
ions cannot move.
What will be produced at the positive electrode in a solution containing both OH- ions and Cl- ions?
Chlorine (Cl2)