Chemistry Redox Reactions Practice Questions PDF

CHEMISTRY 2.7 Name: WORKSHEET TWO REDOX #2 1. Write the ion-electron half equations and then use them to write the balanced oxidation-reduction equations for the following reactions. Indicate any colour...

CHEMISTRY 2.7 Name: WORKSHEET TWO REDOX #2 1. Write the ion-electron half equations and then use them to write the balanced oxidation-reduction equations for the following reactions. Indicate any colour changes that would be observed. (a) Fe3+(aq) + SO2(g) → Fe2+(aq) + SO42-(aq) Oxidation half-equation: Reduction half-equation: Balanced equation: Colour change? (b) Fe2+(aq) + Cl2(g) → Fe3+(aq) + Cl -(aq) Oxidation half-equation: Reduction half-equation: Balanced equation: Colour change? (c) H2O2 (aq) + I-(aq) → H2O (l) + I2 (s) Oxidation half-equation: Reduction half-equation: Balanced equation: Colour change? (d) MnO4- (aq) + Br-(aq) → Mn2+(aq) + Br2 (aq) Oxidation half-equation: Reduction half-equation: Balanced equation: Colour change? (e) Cr2O72-(aq) + HSO3-(aq) → Cr3+(aq) + SO42-(aq) Oxidation half-equation: Reduction half-equation:  Balanced equation: Colour change? 2. When chlorine gas is bubbled into a solution of potassium bromide a colour change is observed. (a) Describe the colour change seen in the solution. (b) (i) Name the reactant that is acting as the oxidant. (ii) Name the reactant that is acting as the reductant. (c) Write balanced half-equations for the oxidation and reduction reactions that occur. Oxidation: Reduction: (d) Combine the half-equations in (c) to give the balanced equation for this oxidation- reduction reaction. (e) Explain the observations you described in (a) by referring to species in equation (d). (f) Which of the halides; chlorine, bromine or iodine is the strongest oxidant? 3. Write balanced equations for the following reactions involving halogens. (a) Magnesium metal and chlorine gas. (b) Hydrogen gas and chlorine gas. (c) Aluminium metal powder and iodine powder. (d) Iron metal (steel wool) and chlorine gas. (e) Chlorine gas and water. Name the two acids produced. Name the ion OCl- Give the common name of this solution.