Barium is slightly more reactive than calcium. Predict the outcome of the follow

Question

Barium is slightly more reactive than calcium. Predict the outcome of the following reactions:

Ba + H20 --->

Ba + O2 ---->

Ba + HCL ---->

Ba + Ca^ 2+ ---->

List the metals Ca, Cu, Fe, Mg, Sn and Zn in order of decreasing activity. The first one should be the most reactive ending with the least reactive.

For each of the following reactions, indicate which substance is oxidized and which is reduced. Which substance is the oxidizing agent and which is the reducing agent?

2Al (s) + 3Cl2 (g) ---> 2AlCl3 (s)

8H^+ (aq) + MnO4 ^- (aq) + 5Fe ^ 2+ (aq) ---> 5Fe6 3+ (aq) + Mn^ 2+ (aq) + 4H2O (l)

FeS (s) + 3NO3^ - (aq) + 4H ^+ (aq) ---> 3NO (g) + SO4 ^ 2- (aq) + Fe ^3+ (aq) + 2H20 (l)

Explanation / Answer

1) (The reactions are not balanceated)
Ba + H2O --> Ba(OH)2 + H2
Ba + O2 --> BaO
Ba + HCl --> BaCl2 + H2
Ba + Ca2+ --> No reaction (because their standard reduction potentials are very similar, then the tendence for a redox reaction is low )

2) Ca, Mg, Fe, Zn, Sn, Cu.

3)

2Al (s) + 3Cl2 (g) ---> 2AlCl3 (s)
Al0 --> Al3+ Aluminium (Al(s)) was oxydized, then is the reducing agent
Cl20 --> Cl- Chlorine (Cl2(g)) was reduced, then is the oxydizing agent


8H+ (aq) + MnO4- (aq) + 5Fe2+(aq) ---> 5Fe3+ (aq) + Mn2+(aq) + 4H2O(l)
Fe2+ --> Fe3+ , iron(II) (Fe2+) was oxydized, then is the reducing agent
MnO4- --> Mn2+ , permanganate (MnO4-) was reduced, then is the oxydizing agent

FeS (s) + 3NO3- (aq) + 4H+ (aq) ---> 3NO (g) + SO42- (aq) + Fe3+ (aq) + 2H20 (l)
S2- --> SO42-, sulphide (S2-) was oxydized, then is the reducing agent
NO3- --> NO, nitrate (NO3-) was reduced, then is the oxydizing agent

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