Redox Worksheet PDF

CHEMISTRY 2.7 Name: WORKSHEET ONE REDOX #1 1. State the oxidation number of the underlined element in each of the following species. (a) HCl (j) FeSO4 (b) CO2...

CHEMISTRY 2.7 Name: WORKSHEET ONE REDOX #1 1. State the oxidation number of the underlined element in each of the following species. (a) HCl (j) FeSO4 (b) CO2 (k) Fe2(CO3)3 (c) SO32- (l) KMnO4 (d) CO (m) MnI2 (e) KI (n) CaO (f) H2O2 (o) Cr2O72- (g) Cr(NO3)3 (p) HSO3- (h) Br2 (q) ZnO (i) H2SO4 (r) H2O 2. State whether each of the following examples is an oxidation or a reduction reaction. (a) Gain of oxygen. (b) Gain of hydrogen. (c) An element becoming a negative ion. (d) An atom that increases its oxidation number. 3. State whether each of the following reactions is an oxidation or a reduction reaction. (a) O2 to O2- (b) I2 to I- (c) Mg to Mg2+ (d) HSO3- to SO42- (e) Fe3+ to Fe2+ (f) Br- to Br2 (g) Cr2O72- to Cr3+ (h) MnO4- to Mn2+ (i) Cl2 to Cl- (j) H+ to H2 4. For each of the reactions that follow write the balanced ion-electron half equation. (a) Cu to Cu2+ (b) Fe2+ to Fe3+ (c) SO32- to SO42- (d) Cr2O72- to Cr3+ (e) MnO4- to Mn2+ 5. For each of the following reactions, state which element is acting as the oxidant and which is acting as the reductant (a) H2 + I2 → 2HI (b) Fe + 2HCl → FeCl2 + H2 (c) Mg + Cu2+(aq) → Mg2+(aq) + Cu (d) 2Fe2+(aq) + I2 → 2Fe3+(aq) + 2I-(aq) 6. For each of the following reactions, state which element is being oxidised and which is being reduced. (a) Cl2 + 2Br-(aq) → 2Cl-(aq) + Br2 (b) Zn + 2HCl → ZnCl2 + H2 (c) SO2 + O2 → SO3 (d) Mg + Cu2+(aq) → Mg2+(aq) + Cu (e) SO32-(aq) + H2O + 2Fe3+(aq) → SO42-(aq) + 2H+(aq) + 2Fe2+(aq) (f) Cr2O72-(aq) + 14H+(aq) + 6Br-(aq) → 2Cr3+(aq) + 7H2O + 3Br2 7. Referring to Question 6 explain your reasoning for (a) (c) (d)