The number indicates the coating thickness in microns (µm). Therefore, we can be electrocuted in case we touch appliances with wet hands. Solution: What is the objective of electroplating ? Why should you not touch electrical appliances with wet hands ? Answer: The zinc is applied as an expendable electrode in a cyanide, alkaline non-cyanide, or acid chloride salt solution. The iodide ions (I- ) react with starch to turn blue black. A tester is used to check the conduction of electricity through two liquids, labelled A and B. (iii) both liquids are equally conducting. Compact Fluorescent Lamps. The bulb does not glow in the set-up shown in figure. Answer: Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Test which solutions conduct electricity and which do not. (c) semi-conductor What do you find? Solution: Question 5. Now immerse the electrodes in this solution. Question 13. Question 8. Electroplating is a process that uses electric current to reduce dissolved metal ions by the use of electrolysis. 2. 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. Which electrode should be attached to the positive terminal of the battery and why? Answer: Question 1. Question 7. Answer: Answer: Electroplating: It is the most common application of the chemical effect of electric current is electroplating. Question 10. Nov 8, 2020 • 1h 5m . Add a little sugar to the distilled water in the third cap and dissolve it. We have seen many times wherein artificial jewellery is shining when it is new and after sometime it begins to lose its shine. Chemical effects of electric current are used widely and one of the effect is electroplating. Question 1. (c) electrolysis and ………….. Answer: Materials which allow electric current to flow through them are called conductors. Rainwater is pure water which is an insulator but it gets mixed with air pollutants like sulphur dioxide and nitrogen oxides and form acidic solution, which is a good conductor of electricity. Define Electroplating and understand it using an activity. Electroplating can be described as an application of electrolysis since electrolysis is the basic technique used for electroplating. You may need to download version 2.0 now from the Chrome Web Store. This completes the circuit of the tester and the bulb should glow. Air is an insulator of electricity. During electroplating, the silver metal from the anode is deposited on the cathode. Some Uses of Electroplating: Imitation jewelry is made by applying a layer of gold or silver. Chemical Effects of Electric Current Class 8 … Electroplating is a general name for processes that create a metal coating on a solid substrate through the reduction of cations of that metal by means of a direct electric current. Consider the following statements about electroplating: I. Electroplating is the coating of metal objects with a thin layer of a different metal. (a), Question 4. Does distilled water conduct electricity? Question 3. Electroplating is a process that uses electric current to reduce dissolved metal ions by the use of … Question 2. (a) anode Tin cans are made by electroplating tin on iron. (ii) The bulb may be fused. If the ends of the wire of tester are touched for a long time, what will happen ? Answer: Can you ex¬plain the reason? The Solstice series, which was specifically designed for ≤200mm wafer processing, also includes the S4, which provides up to four processing chambers, and the LT, with up to three chambers. Similar Classes. Place a small compass needle inside it. This process is known as electroplating. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. Decoration of articles by giving them a layer for e.g., silver plating on cutlery. What are insulators ? It gets deposited on the On passing electric current through the conducting solution of lemon juice and water, chemical reaction takes place. Electroplating One Shot. It is … After removing the electrodes from the solution, we find that copper metal gets deposited on the plate at the negative of the battery. Apart from chemical effect, which other effect electric current produce ? This process is known as electroplating. Which out of the following does not conduct electricity ? What are conductors ? What is LED? (You may obtain distilled water from your school science lab. Answer: (a) magnetic energy into chemical energy Uses of Electroplating and its application in the practical world are provided here. Water is dissociated into its constituent gases, i.e., hydrogen and oxygen. The free copper, being positively charged, gets drawn to the negative terminal of the battery and gets deposited on it. Explain. If the ends of the wire of tester are touched for a long time, the cells will be finished very soon. (b), Question 3. Question 7. Can we call the change taking place in the solution a chemical change? Distilled water is a Question 13. (c) half on the anode and half on the cathode If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Can you explain the reason? How can he do it ? Question 6. Answer: • Electrolytes conduct current at a slow rate than metals. … Electroplating Mention the components of the circuit of tester How will you identify the positive … This process is known as electroplating. Watch Now. The lesson covers the complete explanation of class 8 Chapter 14 Chemical Effects of Electric Currents . Check that all the connections are tight. A general children's introduction to chemistry, focused on the elements, for ages 8–10. A child staying in a coastal region tests the drinking water and also the seawater with his tester. It is deposited on other cheaper metals such as iron to make car parts, taps, bicycle handle bars, wheel rims, etc. (c), Question 7. Now in the second cap containing distilled water, add a few drops of a base such as caustic soda or potassium iodide. Activity 7 (NCERT Textbook, Page 177) Answer: The bulb does not glow in the setup shown in Fig. Name one non-metal which a good conductor of electricity. Electroplating is mainly done for avoiding corrosion of metals and for decorative purposes.Electroplating is a widely used process in many industries like automobiles, airplanes, electronics, jewelry, toys and many more. Learn the concepts of Class 8 Physics Chemical Effects of Electric Current with Videos and Stories. Question 20. By volume of hydrogen gas is twice the volume of oxygen gas. (b), Question 5. In liquids, the movement of charged particles (ions) carry current from anode to cathode terminals. You would conclude that. However, Class 2A thread allowances in sizes No. This shows that distilled water does not conduct electricity. Take 250 ml. It can cause electrocution, as water is a good conductor of electricity. Electroplating makes objects look more attractive and protects them from corrosion and rusting. Paheli had heard that rainwater is as good as distilled water. No, pure water doesn’t conduct electricity. Now connect one free end of the wire to the terminal of a battery. Question 4. Your tester with two free ends of the wire is ready. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. The current is provided by an external power supply. The disposal of the used conducting solution after electroplating is hazardous and can cause environmental pollution. [NCT 2011] What can be the possible reasons for this ? Class 10 Class 12. The writing appears on the paper. Use plating artificial jewellery with gold. In general, all electroplating systems are made from three elements, the anode and cathode and the electrolyte … Answer: Answer: But they are different from each other according to their application. Activity 1 (NCERT Textbook, Page 173) Answer: (b) chemical effect of electricity. Answer: Topics covered are Good or Bad Conductors, tester and its Working, LED, complete and incomplete circuit and effects of current in effecting solutions. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. How will you carry out electroplating of copper in the laboratory. What are conductors ? You’ll need muriatic acid, a 6-volt DC lantern battery, 2 alligator clips, a … Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. When electric current is passed in water hydrogen ions (H+) move towards cathode and get collected over it. Answer: Learn the concepts of Class 8 Physics Chemical Effects of Electric Current with Videos and Stories. (b), Question 8. 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 . Answer: A metal is released in the electrolysis of a salt. The liquid is a conductor and the circuit is also complete, but the bulb does not glow. Steel camshafts in cars have improved wear resistance when they have been electroplated with chromium. Question 5. Question 4. Answer: We call these two rods electrodes. Gradually, a layer of copper builds up on the plate. Question 17. Topics and Sub Topics in Class 8 Science Chapter 14 Chemical Effects of Electric Current: Question 1. Hindi Mathematics. Explain your answer. Note down the terminal of the battery with which this electrode is connected. (d) sides of the container Applying a layer of chromium on an article by this method is called chrome plating. Tin cans are made by electroplating … In electroplating, a complete layer of a second metal is deposited on a first metal by electrolysis. Hindi Mathematics. Commercial zinc-yellow plating has a standard minimum thickness of 0.00020 inches. The seawater contains a huge amount of salts in comparison to drinking water, hence the seawater is a better conductor of electricity and it produces a stronger magnetic field in the wire and hence deflects the compass needle more. Rack electroplating: Rack or wiring plating is a good option if you need to plate large groups of parts. In this activity the bulb glows which shows that lemon juice and vinegar both conducts electricity, hence they are good conductors of electricity. (b) coating Answer: Apparently "MF" means a ferrous substrate in lots of different Japanese specs; "Zn-Ni" means zinc-nickel plating, "8" probably means 8 micron plating thickness. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ……….. terminal of the battery. Answer: Changes of colour of solutions may occur depending on what solution and electrodes are used. LED is Light Emitting Diode. Materials for use in moderate or severe applications must be chromate conversion coated. NCERT Solutions. Water is a solution of salts and so it is a good conductor of electricity. How can you make a tester for testing whether a given material is a conductor or an insulator ? What are insulators ? Class 8 Physics Chemical Effects of Electric Current: Electroplating: Electroplating. Question 4. Answer: LED glows showing the flow of current. Chromium has a good shine, it resists scratches and is corrosion resistant. What are electrodes ? (b), Question 6. Objects that are electroplated are door handles, taps, rims of cycles, showers, the handlebar of cycles and bikes, gas burner, tin cans, metallic almirahs, buckles of belts, etc. Answer: 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. 2-this process uses harmful chemicals that can result in death. Answer: Answer: Question 21. 3. How are bridges and automobiles prevented from rusting ? LEDs emitting white light can be used instead of bulbs. 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. Add a teaspoonful of salt or a few drops of lemon juice to water to make it more conducting. It is concluded that when electric current is passed through the copper sulphate solution, copper sulphate dissociates into copper and sulphate. Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. (a) conductor Explain your answer. [NCERT] Question 10. (d) chemical energy into magnetic energy Same case with bicycle handle bars, nuts, bolts etc. Electroplating household metals is the process of coating them with a different metal, and you can easily do it at home. Performance & security by Cloudflare, Please complete the security check to access. Answer: Attach the free ends of the wires to a LED. Liquid A is a better conductor of electricity because the bulb glows more in it. Question 19. BNAT; Classes. 8 and smaller may not accommodate this thickness. This process is known as electroplating. Answer: 14.6. (b) chemical In this method, parts are placed on a wire rack, allowing each part to come into physical contact with the electrical power source. Question 8. Parts of bicycle, motorbike and sanitary fittings are chrome plated by this method. Fill in the blanks. (d) Nitric acid We use the salt of the cathode as the electrolyte. may be the current is so weak that it does not heat the filament of the bulb allowing it to glow. Why ? Question 2. Study Material. Ended on Nov 15, 2020. Repeat the activity with other liquids such as tap water, vegetable oil, milk, honey. (Remember to wash and wipe the ends of tester after testing each liquid). (i) liquid A is a better conductor than liquid B. Thus, lemon juice, vinegar, tap water, milk, curd and water, and soda are good conductors of electricity while vegetable oil, honey, kerosene oil, and distilled water are poor conductors of electricity or insulators. Copper from impure rod is sought to be transferred to the thin copper plate. Paheli had heard that rainwater is as good as distilled water. Question 12. Explain why they do this. How will you carry out electroplating of copper in the laboratory. You would conclude that Name the gases formed when electric current is passed in water containing a few drops of acid ? Janhavi Govinda rao. Question 6. Question 13. (d) Vinegar as a point source of light in laser beam torches. (d) semi-insulator Instead the iron can be galvanised or painted. Answer: How can the magnetic effect be used as a tester ? Can you explain the reason ? Liquid B is a better conductor than liquid A. The electrode, connected to the positive terminal of a battery, is called Allow the current to pass for about 15 minutes. Answer: Answer: We should not do the experiments on electricity by using electric supply from the mains because there is large amount of current and the person using it can get electrocuted. The coating finds application in screws and other light fasteners, light switch plates and other small parts. EXAMPLE SPECIFICIATION: DONT USE CADMIUM ANY MORE, PLEASE. 14.4). Answer: The possible reasons for this are : Question 4. Solution: Wait for 3-4 minutes. Does lemon juice or vinegar conduct electricity? Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect. Thus water which is free of salts are poor conductors while water with salts is a good conductor of electricity. Electroplating is the process of depositing a thin film of one metal over another metal by passing electric current through an electrolyte. Electroplating: It is the most common application of the chemical effect of electric current is electroplating. Electroplating, process of coating with metal by means of an electric current. Let's know all about it in this session. Question 6. This process is known as chemical effects of current. Does pure water conduct electricity? The bulb in the tester does not glow when current is passed through it. (d) Potassium Answer: Write short note on. Answer: Activity 4 (NCERT Textbook, Page 175) NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. What is the basic principle of electric pen ? Join the free ends of two wires momentarily. Or, the bulb is fused? Why is chromium used for electroplating ? What precautions should be observed when doing electroplating ? Answer: He finds that the compass needle deflects more in the case of seawater. Offered in aluminum, zinc, and tin plating processes. (d) The process of depositing a layer of any desired metal on another material by means of electricity is called _______ So, the fire¬men shut off the electric supply before spraying water to save themselves and other people from electrocution. Answer. Answer: Another way to prevent getting this page in the future is to use Privacy Pass. Explain how it can be used for writing. Classify the following liquids into conductors and insulators : lemon juice, , distilled water, tap water, milk. Chromium is used for electroplating because it has a shiny appearance, does not corrode and is scratch resistant. Insulators : distilled water, milk. We will need copper sulphate and two copper plates of size around 10 cm x 4 cm. Question 1. Give some uses of LED. Hindi Science. Electroplating Mention the components of the circuit of tester How will you identify the positive terminal of a battery if it is hidden in a box and you can only see two of its leads. Electroplating is something you can easily experiment with at school or (with the help of an adult) at home. Gold does not corrode. Leave the other end free. What is CFL ? The temperature around the electroplating equipment should be optimum. ASTM Specification B 633 lists four classes of zinc plating: Fe/Zn 5, Fe/Zn 8, Fe/Zn 12 and Fe/Zn 25. 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. Solution: Vinegar, lemon juice and tap water. Hydroxyl ions (OH )move towards the anode and oxygen is collected on it. When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Recommend (0) Comment (0) person. (c) Sodium There are specific disposal guidelines for environmental protection. Now test if the tester is working or not. The bulb may not glow because of the following reasons: Solution: The passage of an electric current through a solution causes ……………….. effects. Zinc plating is identical to electro-galvanizing in principle because both are electro-deposition processes. The loss of copper from solution is cqmpensated and the process goes on. Watch Now. Electroplating is the process of covering an object with a thin layer of metal by electrochemical deposition. Add a few drops of lemon juice or dilute hydrochloric acid to distilled water in one cap. Answer: Cyanide baths are the most operationally efficient but can potentially create pollutionand are hazardous. The rainwater showed deflection with the tester because it is not as pure as distilled water. Define Electroplating and understand it using an activity. LED is a device in which the two terminals inside the glass bulb are connected together with a metallic point of Galluim Arsenide. It is also called the substrate. Good/Poor Conducting Liquids. Class 12 ; Class 11; Class 10; Class 9; Class 8; Class 7; Class 6; Previous Year Papers. No, it is highly dangerous to carry out the electrical repairs outdoors during the heavy downpour. Answer: Activity 6 (NCERT Textbook, Page 176) We cannot make the whole article from it because it is a very costly metal. Dip the ends of the wire in the given liquid. However, if the bulb does not glow, it means that the tester is not working. Your IP: 184.108.40.206 Name three liquids, which when tested in the manner shown in Fig. Question 2. This makes them look more attractive and also resist corrosion. BOOK FREE CLASS; COMPETITIVE EXAMS. (c) chemical energy into electrical energy Thus food, stored in iron cans, is prevented from being spoilt due to iron by electroplating it by tin. Question 7. Nabamita Bhattacharjee. (c) negative Zigya App. Conclusion. Take out carbon rods carefully from two discarded cells. Applying a layer of chromium on an article by this method is called chrome plating. Oxygen bubbles are formed on the electrode connected to the positive terminal of the battery and hydrogen bubbles are formed on the other electrode. Or, your cells are used up? Ans: Uses of electroplating: (i) Chromium is a shiny metal that does not corrode and resists scratches. Question 8. Please enable Cookies and reload the page. Question 3. LEDs require very little energy and glow even if a small current is passing through the circuit. Wrap an electric wire a few times around the tray. Question 12. Class 8 Science Chapter 14 Chemical Effects of Electric Current Electroplating is the process of depositing desired metal on another metal by using electricity. It has the sound of a JIS spec for zinc plating … Question 2. Electroplating is the application of electrolytic cells in which a thin layer of metal is deposited onto an electrically conductive surface. If not, what can we do to make it conducting? Answer: Electroplating process - definition In electroplating, the article (metal) to be coated is taken as the cathode.The metal to be deposited over it would be the anode and … 343 Views. Refining of metal are for obtaining pure metal. Answer: List the possible reasons. The coating shall be adherent, free from blisters, pits, or discontinuities, and shall be free of cracks in the as plated state. Answer: (a) a good conductor. 206k watch mins. Share. Answer: A tester is used to check the conduction of electricity through two liquids, labelled A and B. Electroplating: Electroplating is used for decorative purposes or to prevent a metal from corrosion. If the current in the circuit is small, how can we test its presence ? Question 14. The electrodes are immersed in an electrolyte (a solution To her surprise, she found that the compass needle showed deflection. Why ? We can test the presence of the small current by using a LED instead of the bulb. Question 11. Which is the most common application of chemical effect of current ? However, zinc plating is used on small parts such as fasteners, crank handles, springs and other hardware items ratherthan sheet metal. In this article we will talk in … Now remove the electrodes from the solution and look at them carefully. Filed Under: Chemical effect of electric current, Class 8 Tagged With: electroplating by chromium, electroplating by tin, use of electroplating About Mrs Shilpi Nagpal Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Observe the electrodes carefully. 1.2 Preparation of Soil 1.02 Preparation of Soil. [NCERT] This video is highly rated by Class 8 students and has been viewed 903 times. Dissolve two teaspoonfuls of copper sulphate in it. What could be the reasons ? A tester can be made by attaching one free end of the wire to a terminal of a battery and another wire from other terminal of the battery to a bulb. For example: All metals including metal wires, copper wires, aluminium foil, etc. In electroplating the word electro stands for electric current and plating means the act of covering a metal object with a thin layer of coating of a different metal Electroplating The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating . Question 10. Question 2. 1-Polutants from electroplating industry are dangerous. Graphite. This may be done for a number of reasons. The articles to be plated should be cleaned throughly to remove dust, grease or any deposit on it. "a3-3" is probably some description of the chromating requirement but I'm not sure. Depending on the coatings, or combinations of coatings, selected a variety of outcomes can be gained. Class 8: Science: Chemical Effects of Electric Current: electroplating Question 16. Collect a few small plastic or rubber caps of discarded bottles and clean them. 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