Chemistry 30 Electrochemistry Assignment 1

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Define oxidation and reduction.

Determine the oxidation number of nitrogen in each of the following compounds:

NH₃

NO₂

Ca₃N₂

NI₃

Determine the oxidation numbers of the requested element in the following compounds:

S in SO₂

Mn in MnO₂

Cr in Cr3+

S in SO₄^2-

B in H₃BO₃

O in Na₂O₂ (hint: this is a peroxide)

Sn in Sn

Cr in K₂Cr₂O₇

Determine the oxidation of each element in (NH₄)₂CO₃

The following reactions are not complete reactions. Determine if each of the following changes is an oxidation, a reduction, or neither:

SO₃^2- → SO₄^2-

CaO → Ca

CrO₄^2- → Cr₂O₇^2-

2 I^- → I₂

For each of the following reactions, complete the summary table below the equation. If an element does not undergo any change, leave the last two columns blank. Also provide the formula of the oxidizing or reducing agent. An example is shown.

CuO + H₂ → Cu + H₂O

element	Initial Ox. No		Final Ox. No.	e - gained or lost	Oxidized or reduced	Oxidizing or Reducing Agent
Cu	+2	→	0	gain 2	reduced	oxidizing agent - CuO
O		→
H		→

CH₄ + 2 O₂ → CO₂ + 2 H₂O

element	Initial Ox. No		Final Ox. No.	e - gained or lost	Oxidized or reduced	Agent
C		→
H		→
O		→

2 Na + Br₂ → 2 NaBr

element	Initial Ox. No		Final Ox. No.	e - gained or lost	Oxidized or reduced	Agent
Na		→
Br		→

Not all of the following reactions are redox reactions. Place a check mark in the appropriate column for each reaction.

Redox

Not Redox

Na₂S + FeCl₂ → 2 NaCl + FeS

2 Na + 2 H₂O → 2 NaOH + H₂

2 KClO₃ → 2 KCl + 3 O₂

SO₂ + H₂O → H₂SO₃

2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Chemistry 30

Redox Reactions & Electrochemistry

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