Accept a multiple of the equations eiv state symbols

Accept a multiple of the equations.
e.iv.
;
State symbols required as asked for in question.
Do not penalize use of equilibrium sign instead of .
Do not accept any multiple of 2H (aq) + 2OH (aq) 2H (g) + O (g).
+ –
2 2
e.v.
electrolytic cell showing solid electrodes immersed in solution;
positive electrode (anode) connected to positive terminal of battery and
negative electrode (cathode) to negative terminal;
Allow graphite or metal given in e(iii) as electrodes .
e.vi.
bubbles /gas produced;
Do not accept hydrogen is formed at cathode and oxygen formed at anode.
e.vii.
;
;
OR
;
;
f.

Many made mistakes in writing a balanced equation for the reaction between Cu and HNO , in drawing a diagram for a hydrogen electrode, in
writing a definition of ‘standard electrode potential’. Most could draw a labeled diagram for an electrochemical cell. Many mistakes were made in
writing balanced equations for reactions at the electrodes and overall equation for the electrolysis of water.
3
a.
Many made mistakes in writing a balanced equation for the reaction between Cu and HNO , in drawing a diagram for a hydrogen electrode, in
writing a definition of ‘standard electrode potential’. Most could draw a labeled diagram for an electrochemical cell. Many mistakes were made in
writing balanced equations for reactions at the electrodes and overall equation for the electrolysis of water.
3
b.i.
Many made mistakes in writing a balanced equation for the reaction between Cu and HNO , in drawing a diagram for a hydrogen electrode, in
writing a definition of ‘standard electrode potential’. Most could draw a labeled diagram for an electrochemical cell. Many mistakes were made in
writing balanced equations for reactions at the electrodes and overall equation for the electrolysis of water.
3
b.ii.
Many made mistakes in writing a balanced equation for the reaction between Cu and HNO , in drawing a diagram for a hydrogen electrode, in
writing a definition of ‘standard electrode potential’. Most could draw a labeled diagram for an electrochemical cell. Many mistakes were made in
writing balanced equations for reactions at the electrodes and overall equation for the electrolysis of water.
3
c.i.
Many made mistakes in writing a balanced equation for the reaction between Cu and HNO , in drawing a diagram for a hydrogen electrode, in
writing a definition of ‘standard electrode potential’. Most could draw a labeled diagram for an electrochemical cell. Many mistakes were made in
writing balanced equations for reactions at the electrodes and overall equation for the electrolysis of water.
3
c.ii.
Many made mistakes in writing a balanced equation for the reaction between Cu and HNO , in drawing a diagram for a hydrogen electrode, in
writing a definition of ‘standard electrode potential’. Most could draw a labeled diagram for an electrochemical cell. Many mistakes were made in
writing balanced equations for reactions at the electrodes and overall equation for the electrolysis of water.