Summative Practice (Question 3 & 4) – Form 5 Science (KSSM) Chapter 6

Question 3:Rohani found a rusted iron nail. Using your knowledge of electrolysis, describe a simple way to prevent the rusting of the iron nail. Answer:The rusting of the iron nail can be avoided by electroplating the iron nail with copper through electrolysis under the following conditions: • iron nail is made the cathode • pure … Read more

Summative Practice (Question 2) – Form 5 Science (KSSM) Chapter 6

Question 2:Figure 2 shows an apparatus set-up to study the electrolysis of aqueous sodium nitrate solution, NaNO3, using carbon electrodes labelled P and Q. (a)(i) State all the cations present in the electrolyte. (a)(ii) State all the anions present in the electrolyte. (b) Which electrode acts as the anode? (c) Name the ion chosen to … Read more

Summative Practice (Question 1) – Form 5 Science (KSSM) Chapter 6

Question 1:Figure 1 shows an apparatus set-up to study the electrolysis of an aqueous copper(II) sulphate solution, CuSO4 using different electrodes as shown in electrolytic cell P and electrolytic cell Q. (a) State the meaning of electrolysis. (b) State all the ions present in the aqueous copper(II) sulphate solution. (c) Name the ions discharged at … Read more

Formative Practice 6.2 – Form 5 Science (KSSM) Chapter 6

Question 1:What is a simple chemical cell? Answer:A simple chemical cell is a device that can convert chemical energy into electrical energy. Question 2:Draw and label a simple chemical cell. Answer: Question 3:How does the position of an ion in the electrochemical series determine the positive terminal and the negative terminal in a simple chemical … Read more

Formative Practice 6.1 – Form 5 Science (KSSM) Chapter 6

Question 1:Draw and label the structures of an electrolytic cell. Answer: Question 2:Describe the movement of ions to electrodes during electrolysis. Answer:During electrolysis, positive ions (cations) move to the cathode (negative electrode) and negative ions (anions) move to the anode (positive electrode). Question 3:Give four examples of applications of electrolysis in industries. Answer:Extraction of metal, … Read more


  Electrolysis 1. Electrolysis is a process where a compound is separated into its constituent elements when electric current passes through an electrolyte.   2. In electrolysis, energy is changed as shown below: Electrical energy → chemical energy 3. The apparatus used in an electrolytic cell consists of a dry cell or battery, an electrolyte and … Read more