Take out the ends of the tester from the lemon juice, dip them in water and then wipe them dry. Electroplating is a very useful process. In an activity to check the conduction of electricity through two liquids labelled A and B by using a bulb, it is observed that the bulb glows brightly for liquid A while it glows very dimly for liquid B. Free Science Class 8 Notes, Class 8 Scince Syllabus, CBSE Class Notes and Study Material, from the latest edition of CBSE (NCERT) books, Solutions and Question Answers. Ans: Putting out a fire in an electrical appliance by pouring water on it can be dangerous as water conducts electricity and people who come in contact with the water can get electric shocks. 1. The lesson covers the complete explanation of class 8 Chapter 14 Chemical Effects of Electric Currents . 4.8.5 Covering Power and Throwing Power. Observe the circuit given in Fig. Required fields are marked *. Dec 20, 2020 - What is Electroplating and How is it Done? Conduct copper plating activity. The key process of electrolysis is the exchange of atoms and ions from the external circuit by removing or adding electrons. Very Short Answer Questions - Chemical Effects of Electric Current, Short Answer Questions - Chemical Effects of Electric Current, Long Answer Questions - Chemical Effects of Electric Current, Test: Chemical Effects Of Electric Current - 4, Test: Chemical Effects Of Electric Current - 3, RD Sharma Solutions for Class 8 Mathematics. It is analogous to a galvanic gll acting in reverse. To Study What is Electroplating and How is it Done? want What is Electroplating and How is it Done? Ans: A substance which conducts electricity in the liquid state or when dissolved in water and breaks up chemically during the process is called an electrolyte. Class 8 What is Electroplating and How is it Done? The method of coating one metal over another by use of electric current is known as electroplating. 4.8.6 Process Monitoring Question 1.The decomposition of an electrolyte when electricity is passed through it, is called(a) conduction(b) coating(c) electrolysis(d) electro refiningAnswer:(c), Question 2.Which out of the following does not conduct electricity ? To predict the products of the electrolysis of water based on the chemical ... Use a diagram to illustrate the movement of ions in electroplating. As C u 2 + ion is positively charged, it moves towards the negative terminal i.e. Short Q&A: Q1: Differentiate between good conductors and bad conductors of electricity. 3. Observe the nails carefully. Question from very important topics are covered by NCERT Exemplar Class 8.You also get idea about the type of questions and method to answer in your Class 8th examination. The Guardian, April 29, 2015. If you D SHORT-ANSWER QUESTIONS (TYPE II): Answer in about 30 words. Explain the electroplating of copper on an iron spoon. 4.8 Electroplating Process Control and Chemical Analysis of Plating Solutions. The term is also used for electrical oxidation of anions on to a solid substrate, as in the formation of silver chloride on silver wire to make silver/silver-chloride electrodes. Lakhmir Singh Science Class 8 Chapter 14 Multiple Choice Questions (MCQs) Question 46. Electroplating. 1. The apparatus is shown in the figure given below. Class 8 Video | EduRev ppt and other Class 8 slides as well. Ans: The rate of the flow of charge is called an electric current. (iv) Zinc is electroplated on iron used to make bridges and automobiles. Boojho set up this circuit for purification of copper. Class 10 Class 12. DK, 2007/2016. A general children's introduction to chemistry, focused on the elements, for ages 8–10. copper plate. Protection of the surface of bases metals which corrode for e.g., iron is plated with chromium. EduRev is like a wikipedia just for education and the What is Electroplating and How is it Done? On the diagram above (Figure 2) indicate the direction of electron flow in both wires, and label the anode and cathode on both the battery and the electrolytic cell. Differentiate between conductors and insulators. Ans: Chromium is a shiny metal that does not corrode and resists scratches. A simple example of the electroplating process is the electroplating of copper in which the metal to be plated (copper) is used as the anode, and the electrolyte solution contains the ion of the metal to be plated (Cu 2+ in this example). Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. of this page. Electroplating is the application of electrolytic cells in which a thin layer of metal is deposited onto an electrically conductive surface. Science . Electrolyte is the solution of soluble salt of metal to be deposited. (a) Aluminium(b) Iron(c) Sodium(d) PotassiumAnswer:(b). Electroplating is a process that uses electric current to reduce dissolved metal ions by the use of electrolysis. What will be the nature of – (i) plate A (ii) plate B (iii) the solution. It is important to remind learners that circuit diagrams are just schematics of a circuit. A coating of zinc is provided to protect iron from corrosion and rust. The object (iron spoon) to be electroplated is made cathode (–ve electrode). Electrolytic refining: It is the process of refining of metal in which impure metal is made the anode and a thin strip of pure metal is made the cathode.A solution of metal salt is used as an electrolyte. Students and parents can download free a This observation, therefore, shows that electric current has a chemical effect on water. Most liquids that conduct electricity are solutions of …………, ………. 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