In the reaction MgCl2(l) ➝ Mg(s) + Cl2(g) , the oxidising agent is .......
1 point
1
Question 2
2.
Which of the following reactions is non-spontaneous?
1 point
1
Question 3
3.
5 points
5
Question 4
4.
Fe + HCl → FeCl2 + H2
Identify ONE substance being oxidised, ONE being reduced, ONE spectator ion, ONE oxidising agent and ONE reducing agent from the list of possible answers.
Note that not all of the listed substances need to be used and some may be used more than once.
Fe
Fe2+ ions
H2
H+ ions
Cl− ions
Cl2
Substance being oxidised
Substance being reduced
Spectator ion
Oxidising agent
Reducing agent
1 point
1
Question 5
5.
In a spontaneous reaction, which of the following metals is least likely to donate its electrons?
2 points
2
Question 6
6.
For the following redox reaction, select the appropriate oxidation and reduction half-reaction:
Na + Fe3+ → Na+ + Fe2+
Fe2+ + 2e- → Fe
Fe3+ + e- → Fe2+
Fe → Fe2++ 2e-
Na → Na++ e-
Na++ e- → Na
Fe2+ → Fe3++ e-
Fe3+ + 3e- → Fe
Fe → Fe3++ 3e-
oxidation half-reaction
reduction half-reaction
2 points
2
Question 7
7.
In an electrolytic cell, a piece of aluminium is placed in a VERY CONCENTRATED solution of barium(II) nitrate.
Which equations correctly represent the half-reactions that take place?
Ba ➝ Ba2+ + 2ē
Al ➝ Al3+ + 3ē
2H2O ➝ O2 + 4H+ + 4ē
Ba2+ + 2ē ➝ Ba
Al3+ + 3ē ➝ Al
2H2O + 2ē ➝ H2 + 2OH−
oxidation half reaction
reduction half reaction
2 points
2
Question 8
8.
In an electrolytic cell, a piece of aluminium is placed in a VERY DILUTE solution of barium(II) nitrate.
Which equations correctly represent the half-reactions that take place?