Use the following electrode potentials to answer the question.
Sn2+ (aq) + 2e- ⇌ Sn (s) Eθ = -0.14 V
Fe3+ (aq) + e- ⇌ Fe2+ (aq) Eθ = +0.77 V
What will be the EMF, in V, when the following voltaic cell is connected?
Sn (s) + 2Fe3+ (aq) → 2Fe2+ (aq) + Sn2+ (aq)
-0.91
+0.63
+1.68
+0.91
Which of the following reactions could take place at the positive electrode (cathode) in a voltaic cell?
I and II only
I and III only
II and III only
I, II and III
What is true when aqueous copper(II) sulfate is electrolysed using platinum electrodes?
H2 and O2 are produced in a 2:1 mole ratio
Cu and O2 are produced in a 2:1 mole ratio
H2 and O2 are produced in a 1:1 mole ratio
Cu and O2 are produced in a 1:1 mole ratio
Use the following electrode potentials to answer the question.
Zn2+ (aq) + 2e- ⇌ Zn (s) Eθ = -0.76 V
Cl2 (aq) + 2e- ⇌ 2Cl- (aq) Eθ = +1.36 V
Mg2+ (aq) + 2e- ⇌ Mg (s) Eθ = -2.37 V
Predict what happens when some powdered zinc is added to aqueous magnesium chloride?
There is no reaction observed
Bubbles of chlorine gas will be seen
Magnesium metal will be produced
Zinc chloride will be produced
Which of the following electrolytic cells would give the greatest mass of metal at the cathode?
|
|
Current |
Time |
Solution |
|
A. |
1.5 |
250 |
1.0 mol dm-3 AgNO3 (aq) |
|
B. |
1.0 |
750 |
1.0 mol dm-3 CuSO4 (aq) |
|
C. |
2.0 |
250 |
1.0 mol dm-3 AgNO3 (aq) |
|
D. |
1.0 |
500 |
1.0 mol dm-3 CuSO4 (aq) |
