Topic Content:
- Theory Questions and Answers – Electrolysis
Theory Questions – Electrolysis:
1. (a) What is a conductor? Give two examples of a conductor
(b) Classify the following as conductor/non-conductor.
(i) Iron rod (ii) Candle (iii) Tin can (iv) Rubber (v) Diamond
2. What is an electrolyteAn electrolyte is a substance that dissociates in water into charged particles called ions. Positively charged ions are called cations. Negatively charged ions are called anions. Simply, an electrolyte is a... More? Give two examples of electrolyte
(b) Define a non-electrolyte
(c) Explain why NaCl(s) does not conduct electricity, but NaCl(aq) does
3. Write the equations for anodic and cathodic half-reactions which occur during electrolysis of copper(II) tetraoxosulphate(IV) solutions, using the following electrodes
(i) Platinum electrodes
(ii) copper electrodes
(iii) Copper cathodeA cathode is the electrode from which a conventional current leaves the electrolyte. It is the negative part of the cell where reduction takes place. More and carbon anode
(iii) Carbon cathode and copper anodeAn anode is an electrode of a polarized electrical device through which conventional current enters the device. It is the positive part of electrolytes where oxidation takes place. More
(b) List three factors affecting the discharge of ions in electrolysis.
4. Which of the following ions will migrate to the Cathode during electrolysis?
(a) Zinc ions
(b) Chloride ions
(c) Sulphide ions
(d) Tetraoxosulphate(vi)ions
5. (a) Define the term electrolysis.
(b) (i) What are electrodes? (ii) Name two types of electrodes.
(c) Distinguish between the anode and the cathode
(d) Draw and label a simple electrolytic cell
6. (a) State and explain how the pH of the electrolyte changes during the electrolysis of dilute CuCl2(aq) using graphite electrodes.
(b) List the ions present in the aqueous solutionA solution in which the solvent is water. is called an aqueous solution. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a... More of iron(II) tetraoxosulphate(VI)
(c) With the aid of a well-labeled diagram describe the electrolysis of dilute sodium tetraoxosulphate(VI) using suitable electrodes. Name the electrodes
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