Which of the following statements are true? For statements a) through d) use the

Question

Which of the following statements are true?

For statements a) through d) use the reaction:

SiCl4 (l) + 2 Mg (s) 2 MgCl2 (s) + Si(s)

a) Mg is the reducing agent

b) SiCl4 is the reducing agent.

c) Mg is reduced

d) SiCl4 (or Si in SiCl4) is reduced.

e) HCl (g) + NH3 (g) NH4Cl (s)is aredox reaction

f) 2 CuCl(aq) CuCl2 (aq) + Cu (s)is a redoxreaction

Explanation / Answer

Assign oxidation numbers +4  -1             0                 +2  -1            0 SiCl4 (l) + 2 Mg (s) 2 MgCl2 (s) + Si(s) Cl is neither oxidized nor reduced Si is being reduced (+4 -->0), SiCl4 is the oxidizing agent Mg is being oxidized (0 --> +2), Mg is the reducingagent True statements are A, D, E (use oxidation numbers to figure out,similar to above) F doesn't make sense because an ion cannot reduce an ion of thesame element. The electrons must flow from an element that is astronger reducing agent

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