The metal that needs to be deposited is used as the cathode while the metal on which it is deposited is used as anode. After the electroplating of a spoon with silver, it was found that the anode has become thin. (iii) The cells may be used up. Join the free ends of the tester together fora moment. Janhavi Govinda rao. Dinesh can study the chemical effect of current at home very easily. Answer: It is … Question 4. Question 6. The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. (b) pole The compass needle should show deflection. Compact Fluorescent Lamps. Zinc plating is identical to electro-galvanizing in principle because both are electro-deposition processes. This shows that distilled water does not conduct electricity. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Chemical Effects of Electrical Current. If the tester is put in distilled water, the bulb of the tester does not glow. [NCT 2011] In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Give the construction of LED. Explain your answer. CIP specializes in the unique process of mechanical plating and galvanizing that provides excellent corrosion resistance. (b) The passage of an electric current through a solution causes _______ effects. Take two pieces of copper wire and iron wire. Add a little sugar to the distilled water in the third cap and dissolve it. Answer: Question 15. Question 1. Ended on Nov 15, 2020. Answer: Dip the ends of the wire in the given liquid. Call today! (ii) The bulb may be fused. Electroplating can be described as an application of electrolysis since electrolysis is the basic technique used for electroplating. But when salt is dissolved in distilled water and again tested, the bulb glows which shows that water containing salts conduct electricity. Connect the copper plates to the terminals of a battery and immerse them in copper sulphate solution (Fig. (Remember to wash and wipe the ends of tester after testing each liquid). Electroplating is the process in which a coating of one metal can be deposited on the surface of another metal by using current from a battery. Class 12 ; Class 11; Class 10; Class 9; Class 8; Class 7; Class 6; Previous Year Papers. Answer: Steel camshafts in cars have improved wear resistance when they have been electroplated with chromium. Conclusion. Therefore, we can be electrocuted in case we touch appliances with wet hands. (b) Oxalic acid List the possible reasons. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. Take 250 ml. What are insulators ? A tester is used to check the conduction of electricity through two liquids, labelled A and B. (d) sides of the container Question 3. Similar Classes. Electroplating: Electroplating is used for decorative purposes or to prevent a metal from corrosion. If it is still not working then replace the cells with fresh cells. (b), Question 6. (c) Dilute sulphuric acid Answer: Answer: Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect. (a) conduction Activity 5 (NCERT Textbook, Page 176) If not, what can we do to make it conducting ? The part to be coated acts as the cathode of an electrolytic cell; the electrolyte is a solution of a salt of the metal to be coated; and the anode is usually either a block of that metal, or of some inert conductive material. (b), Question 5. The writing appears on the paper. Electroplating: Electroplating is used for decorative purposes or to prevent a metal from corrosion. The possible reasons for this are : Question 4. The sea water contains more salts dissolved in it as compared to the tap water. [NCERT]. Answer: Question 10. may be the current is so weak that it does not heat the filament of the bulb allowing it to glow. Take the tray from inside a discarded matchbox. Water is dissociated into its constituent gases, i.e., hydrogen and oxygen. Answer: Materials which allow electric current to flow through them are called conductors. (c) electrolysis Class 8: Science: Chemical Effects of Electric Current: electroplating In electroplating, a complete layer of a second metal is deposited on a first metal by electrolysis. In general, all electroplating systems are made from three elements, the anode and cathode and the electrolyte … Why are LEDs more useful for testing the flow of electric current ? What are insulators ? What is electroplating? Question 6. Collect a few small plastic or rubber caps of discarded bottles and clean them. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. We prefer not to do electroplating on iron used for bridges because it is very costly. Activity 3 (NCERT Textbook, Page 174) So she collected some rainwater in a clean glass tumbler aifd tested it using a tester. Please enable Cookies and reload the page. Record your observations in Table 14.1. Question 2. Question 1. Place them in fresh lemon fruit. We call these two rods electrodes. The electrode, connected to the positive terminal of a battery, is called Do you find any difference in any one of them? (a) anode On the other hand the loss of copper from the solution is regained from the impure copper rod which is attached to the positive terminal of the battery. CBSE 8 Science 01 Crop Production and Management 7 Topics | 8 Quizzes 1.1 Agricultural Practices and Cropping Pattern 1.01 Agricultural Practices and Cropping Pattern . Electroplating, process of coating with metal by means of an electric current. In this article we will talk in … How would you classify lemon juice or vinegar—a good conductor or a poor conductor? Question 5. Most liquids that conduct electricity are solutions of …………, ………. The disposal of the used conducting solution after electroplating is hazardous and can cause environmental pollution. The bulb does not glow in the set-up shown in figure. NCERT Books. Write on the paper with the end of the wire connected to the positive terminal. We have seen many times wherein artificial jewellery is shining when it is new and after sometime it begins to lose its shine. III. If they are, then replace the bulb with another bulb. Your IP: 103.227.176.25 Is air an insulator or conductor of electricity ? Answer: Ans: Uses of electroplating: (i) Chromium is a shiny metal that does not corrode and resists scratches. Learn the concepts of Class 8 Physics Chemical Effects of Electric Current with Videos and Stories. 8 and smaller may not accommodate this thickness. Share. How will you carry out electroplating of copper in the laboratory. You may also get distilled water from a medical store or a doctor or a nurse). Iron is a strong metal used for making bridges. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. (c) Sodium In this activity, if the bulb does not glow, it means that either the connections of the circuit are loose or the bulb is fused or cells are used up. Clean copper plates with sand paper. So, the fire¬men shut off the electric supply before spraying water to save themselves and other people from electrocution. Pour about two teaspoonfuls of distilled water in each of them. Applying a layer of chromium on an article by this method is called chrome plating. Paheli had heard that rainwater is as good as distilled water. 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