Part A Which of the following are redox reactions? -P4( s )+10HClO( aq )+6H2O( l

Question

Part A

Which of the following are redox reactions?
-P4(s)+10HClO(aq)+6H2O(l)4H3PO4(aq)+10HCl(aq)
-Br2(l)+2K(s)2KBr(s)
-CH3CH2OH(l)+3O2(g)3H2O(l)+2CO2(g)
ZnCl2(aq)+2NaOH(aq)Zn(OH)2(s)+2NaCl(aq)

Check all that apply.

P4(s) + 10HClO(aq) + 6H2O(l) 4H3PO4(aq) + 10HCl(aq)

Br2(l) + 2K(s) 2KBr(s)

CH3CH2OH(l) + 3O2(g) 3H2O(l) + 2CO2(g)

Correct

Part B

For those reactions that are redox, indicate which elements are oxidized.

Express your answers as chemical symbols separated by a commas

P4(s) + 10HClO(aq) + 6H2O(l) 4H3PO4(aq) + 10HCl(aq)

Br2(l) + 2K(s) 2KBr(s)

CH3CH2OH(l) + 3O2(g) 3H2O(l) + 2CO2(g)

Explanation / Answer

Part A

First three reactions are redox reactions.

P4(s)+10HClO(aq)+6H2O(l)4H3PO4(aq)+10HCl(aq)

Br2(l)+2K(s)2KBr(s)

CH3CH2OH(l)+3O2(g)3H2O(l)+2CO2(g)

Part B

Answer: P, K, C

Reaction 1: P(0) to P(+5)

Reaction 2: K(0) to K(+1)

Reaction 3: C(multiple) to C(+4)

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