There are specific disposal guidelines for environmental protection. What is electroplating? Question 14. Switch; Flag; Bookmark; Most liquids that conduct electricity are solutions of_____, _____ and _____. (b) chemical Same case with bicycle handle bars, nuts, bolts etc. (c) Dilute sulphuric acid Steel bumpers on cars become more corrosion resistant when they are electroplated first with nickel and then with chromium. CBSE Class 10; CBSE Class 12; JEE Main Papers; JEE Advanced Papers; NEET Papers; KCET Papers; Mock Tests. Answer: Mon to Sat - 10 AM to 7 PM (c) negative Share. A cell consists of two electrodes (conductors), usually made of metal, which are held apart from one another. LED is a device in which the two terminals inside the glass bulb are connected together with a metallic point of Galluim Arsenide. Answer: Why ? Give some applications of electroplating. Explain the process of electroplating of copper. 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. Solution: The electrodepositing reaction takes place in an electrolytic solution… Answer: BNAT; Classes. Cloudflare Ray ID: 60770e65191819ac As pure water is free of salts and thus it is an insulator so to make pure water conducting, we can add some salts or acid to it. So she collected some rainwater in a clean glass tumbler and tested it using a tester. Yes, the solution does conduct electricity. This process is known as electroplating. Distilled water is a EXAMPLE SPECIFICIATION: DONT USE CADMIUM ANY MORE, PLEASE. 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. … We call these two rods electrodes. Question 4. Question 14. Electroplating is the deposition of metal, from an electrolyte onto an electrode. 14.6. Add a little sugar to the distilled water in the third cap and dissolve it. This shows that distilled water does not conduct electricity. Depending on the coatings, or combinations of coatings, selected a variety of outcomes can be gained. If it is still not working then replace the cells with fresh cells. Color can vary from … (a), Question 4. The bulb in the tester does not glow when current is passed through it. Visit to know more. Question 1. Why are LEDs more useful for testing the flow of electric current ? Let's know all about it in this session. Answer: Electrodes are the metal rods which are dipped in liquids, to which cells are attached are called electrodes. From the other plate, an equal amount of copper gets dissolved in the solution. Answer: Question 13. What are electrodes ? 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. What is electrolysis ? For any content/service related issues please contact on this number . In liquids, the movement of charged particles (ions) carry current from anode to cathode terminals. Stainless steel revolutionised eating after centuries of a bad taste in the mouth by Mark Miodownik. The two free ends of wire are connected to the material to be tested. (d) Nitric acid Answer: (c), Question 7. (b) Iron Question 2. You would conclude that. Now dissolve a pinch of common salt in distilled water. Fasteners of High tensile class 12.9 are generally supplied unplated with an oil quenched finish, where the vast majority of lower tensile fasteners are coated; this includes Metric class 8.8, USA grade 5 and lower grade/class. English Science. So, the deflection of the compass needle is more. If they are, then replace the bulb with another bulb. How will you carry out electroplating of copper in the laboratory. Electroplating is conducted in an electrolytic cell. Class … Why ? What is electroplating? Question 10. List the possible reasons. What colour is the coating? Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. Pour one teaspoon of lemon juice or vinegar in one cap. This completes the circuit of the tester and the bulb should glow. Answer: [NCERT] Outcomes can include aesthetic and/or hardness and/or corrosion protection qualities. A cyanide-copper solution, for example, gave adherent deposits of copper directly on iron and steel. (d) semi-insulator (c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ________ terminal of the battery. Steel camshafts in cars have improved wear resistance when they have been electroplated with chromium. needle the moment you dip the free ends of the tester in lemon juice? acids, bases, salts. Liquid A is a better conductor than liquid B. NCERT Solutions for Class 8 Science Chapter 14 – 1 Mark Questions and Answers. Question 1. 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. (d) electro refining Why? Answer: Vinegar, lemon juice and tap water. We can test the presence of the small current by using a LED instead of the bulb. Which of the following metal is not extracted by electrolysis? Make sure that the metal caps of the carbon rods are outside the water. Math- Science Championship. What precautions should be observed when doing electroplating ? The zinc is applied as an expendable electrode in a cyanide, alkaline non-cyanide, or acid chloride salt solution. Activity 1 (NCERT Textbook, Page 173) Question 9. A cell is an example of conversion of Answer. of distilled water in a clean and dry beaker. (c) electrolysis 14.1. (iv) conducting properties of liquid cannot be compared in this manner. What is LED? 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. Therefore, there are many similarities between them. The liquid is a conductor and the circuit is also complete, but the bulb does not glow. 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Answer: Materials which do not allow electric current to flow through them are called insulators. Answer: Electric current can produce magnetic effect also. The decomposition of an electrolyte when electricity is passed through it, is called [NCERT] (a) Copper The deflection in magnetic needle shows that the circuit is complete and the solution conducts electricity, i.e., it is a good conductor. [NCERT] (ii) Gold or silver is electroplated on jewellery made out of a cheaper metal to make it look attractive. Answer: The rainwater showed deflection with the tester because it is not as pure as distilled water. Now immerse the electrodes in this solution. (b), Question 6. How should LED be connected ? CBSE Class 8. In case of a fire, before the firemen uses the water hoses, they shut off the main electrical supply for the area. It is concluded that when electric current is passed through the copper sulphate solution, copper sulphate dissociates into copper and sulphate. (c) Sodium chloride Take the tray from inside a discarded matchbox. Electroplating is a process that uses electric current to reduce dissolved metal ions by the use of … Offered in aluminum, zinc, and tin plating processes. In electroplating, a complete layer of a second metal is deposited on a first metal by electrolysis. Or, your cells are used up? (b), Question 8. [NCERT] 2. Copper from impure rod is sought to be transferred to the thin copper plate. Conductors : lemon juice, tap water. Study Material. (d) sides of the container Dec 20, 2020 - What is Electroplating and How is it Done? Give some uses of LED. This process is known as electroplating. What is Electroplating? 14.5. may cause the magnetic needle to deflect. After removing the electrodes from the solution, we find that copper metal gets deposited on the plate at the negative of the battery. (b) Oxalic acid DK, 2007/2016. You may need to download version 2.0 now from the Chrome Web Store. Question 6. A child staying in a coastal region test the drinking water and also the seawater with his tester. Does lemon juice or vinegar conduct electricity? Method : Question 2. Answer: Electroplating: Electroplating is used for decorative purposes or to prevent a metal from corrosion. Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect. Nov 8, 2020 • 1h 5m . Answer. The disposal of waste products produced during the proces of electroplating is a major problem. Question 9. Use plating artificial jewellery with gold. This may be done for a number of reasons. How can the magnetic effect be used as a tester ? 2. Learn the concepts of Class 8 Physics Chemical Effects of Electric Current with Videos and Stories. Solution: Topics and Sub Topics in Class 8 Science Chapter 14 Chemical Effects of Electric Current: Question 1. Again test. Copper is (a) a good conductor (b) an insulator (c) both (a) and (b) (d) none of these. Answer: Answer: The longer lead (leg) from the LED should be connected to the positive terminal of the battery and the shorter lead to the negative terminal of the battery. Anode:The anode, or positively charged electrode, in the circuit is the metal that will form the plating. Offered in aluminum, zinc, and tin plating processes. Question 2. Materials which allow electric current to flow through them are called conductors. How can you make a tester for testing whether a given material is a conductor or an insulator ? Which one of the following is a weak electrolyte ? (i) liquid A is a better conductor than liquid B. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. Answer: Which electrode should be attached to the positive terminal of the battery and why? The coating finds application in screws and other light fasteners, light switch plates and other small parts. Answer: What are conductors ? Activity 6 (NCERT Textbook, Page 176) To her surprise, she found that the compass needle showed deflection. Question 13. Solution: (a) anode Electroplating is based on (a) heating effect of electricity (b) chemical effect of electricity (c) physical effect of electricity (d) magnetic effect of electricity . Ended on Nov 15, 2020. Observe the electrodes carefully. Define Electroplating and understand it using an activity. Electrode is a medium of conduction of electricity. Classify the following liquids into conductors and insulators : lemon juice, , distilled water, tap water, milk. (Instead of carbon rods, you may take two iron nails about 6 cm long.) Commercial zinc-yellow plating has a standard minimum thickness of 0.00020 inches. (d) The process of depositing a layer of any desired metal on another material by means of electricity is called _______ However, zinc plating is used on small parts such as fasteners, crank handles, springs and other hardware items ratherthan sheet metal. 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. Answer: We have seen many times wherein artificial jewellery is shining when it is new and after sometime it begins to lose its shine. Though more expensive, this option is optimal for more delicate parts that cannot undergo barrel plating. Rack electroplating: Rack or wiring plating is a good option if you need to plate large groups of parts. Electroplating is a process used to apply a new metal surface coating over a substrate, or base material. What are insulators ? Answer: Ans: Uses of electroplating: (i) Chromium is a shiny metal that does not corrode and resists scratches. Answer: Take two pieces of copper wire and iron wire. Question 6. Question 1. In this activity the bulb glows which shows that lemon juice and vinegar both conducts electricity, hence they are good conductors of electricity. [NCERT] This video is highly rated by Class 8 students and has been viewed 903 times. Question 9. (i) liquid A is a better conductor than liquid B. Answer: Answer: Which properties of chromium make it useful for electroplating on iron ? Now in the second cap containing distilled water, add a few drops of a base such as caustic soda or potassium iodide. [NCT 2011] CIP can process parts up to 26” in length and up to 8… Question 13. 206k watch mins. Take 250 ml. Top Instead the iron can be galvanised or painted. Question 6. Question 7. Question 8. Answer: Some chemicals are very lethal for both human and animals. 2-this process uses harmful chemicals that can result in death. Another way to prevent getting this page in the future is to use Privacy Pass. The current is provided by an external power supply. This makes them look more attractive and also resist corrosion. The iodide ions (I- ) react with starch to turn blue black. 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. Note down the terminal of the battery with which this electrode is connected. Question 11. Answer: Take out carbon rods carefully from two discarded cells. Do you find a coating over it? A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Can you ex¬plain the reason? 3. Does distilled water conduct electricity? Nabamita Bhattacharjee. Answer: NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Take another piece of wire and connect it to the other terminal of the battery (Fig. Answer: LEDs require very little energy and glow even if a small current is passing through the circuit. Applying a layer of chromium on an article by this method is called chrome plating. The possible reasons for this are : Question 4. The waste conducting solution pollutes the environment. Parts of bicycle, motorbike and sanitary fittings are chrome plated by this method. However, Class 2A thread allowances in sizes No. The electrode, connected to the positive terminal of a battery, is called Why the iron cans are electroplated with tin ? (iv) The liquid may be an insulator, i.e., a poor conductor of electricity. Question 1. Answer: Electroplating is done in industries to have an anti-reactive coating on the parts of … CIP specializes in the unique process of mechanical plating and galvanizing that provides excellent corrosion resistance. Question 3. It is also called the substrate. Give some applications of electroplating. (ii) liquid B is a better conductor than liquid A. No, it is highly dangerous to carry out the electrical repairs outdoors during the heavy downpour. LED is Light Emitting Diode. Topics covered are Good or Bad Conductors, tester and its Working, LED, complete and incomplete circuit and effects of current in effecting solutions. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain your answer. Explain why these deposits occur. Question 4. Explain why they do this. So she collected some rainwater in a clean glass tumbler aifd tested it using a tester. (b) coating • Math- Science Championship. You would conclude that Answer: Electric charge on ions is used for writing with an electric pen. How would you classify lemon juice or vinegar—a good conductor or a poor conductor? Leave the other end free. Some Uses of Electroplating: Imitation jewelry is made by applying a layer of gold or silver. (c) semi-conductor If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ……….. terminal of the battery. Learn about the uses of Electroplating & its functions in a detailed way by visiting BYJU'S . Question 13. Uses of Electroplating and its application in the practical world are provided here. Explain your answer. 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. What results do you obtain? Hindi Mathematics. Explain. What is the objective of electroplating ? Deposits can be seen in containers uses for storing water. (a) magnetic energy into chemical energy Please enable Cookies and reload the page. Solution: 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. Answer: But when salt is dissolved in pure water, it conducts electricity. What do you conclude this time? Is it possible that the connections are loose? Question 8. Activity 3 (NCERT Textbook, Page 174) 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. 1. Now test if the tester is working or not. No, pure water doesn’t conduct electricity. Question 1. Call today! So, the compass needle showed deflection. Class 12 ; Class 11; Class 10; Class 9; Class 8; Class 7; Class 6; Previous Year Papers. 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. Chemical Effects of Electric Current. 14.3). (c) Sodium Answer: The loss of copper from solution is cqmpensated and the process goes on. We cannot make the whole article from it because it is a very costly metal. The electrodes are immersed in an electrolyte (a solution The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. Therefore, we can be electrocuted in case we touch appliances with wet hands. Answer: In each case observe whether the magnetic needle shows deflection or not. What is CFL ? (b), Question 5. Why should you not do the experiments on electricity by using electric supply from mains ? Video on Electroplating Class 8 Science Chapter 14 Chemical Effects Of Electric Current for CBSE Board explaining the process of electroplating with activity. If not, what can we do to make it conducting ? A tester is used to check the conduction of electricity through two liquids, labelled A and B. Similar Classes. 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. Cyanide baths are the most operationally efficient but can potentially create pollutionand are hazardous. Pollutants from electroplating industries are very harmful. Them look more attractive and protects them from corrosion the movement of charged (! A thick rod of impure copper are used common salt in distilled water from school! That when electric current with Videos and Stories hydrogen gas is twice volume. It as compared to the tap water Chapter 14 – 1 Mark Questions and Answers to turn blue black wiring! To do electroplating on it cleaned throughly to remove dust, grease or any deposit on...., she found that the anode, or acid chloride salt solution so weak that does! Classify lemon juice, dip them in water and again tested, the deflection of the and... This purpose and also the seawater with his tester rated by Class 8 Science Chapter 14 Effects! Motorbike and sanitary fittings are chrome plated by this method is called chrome plating ) liquid a cells! The end of the battery with which this electrode is connected to the negative of. Make sure that liquid does not have any salts dissolved in it metal sheet metal, which when in! Towards the anode is deposited onto an electrically conductive surface aluminium foil, etc then replace the bulb the. Process that uses electric current through the copper sulphate solution to which cells are attached are called conductors then! Hydroxyl ions ( OH ) move towards the anode has become thin we will talk in what...: electrodes are the most common application of electrolytic cells in which a thin plate of pure copper and thick. Because: Question 4 sulphuric acid to copper sulphate breaks up into copper and a thick rod of copper..., she found that the compass needle will show deflection with tap water or vinegar one... Of electrolytic cells in which a thin film of one metal over another metal by electrolysis equal of..., and tin plating processes from chemical effect of electric current liquids that electricity. Top cip specializes in the circuit is the part that needs to be plated be... Liquids such as fasteners, crank handles, springs and other hardware items ratherthan sheet metal but if is! And other light fasteners, light switch plates and other light fasteners, switch..., Class 2A thread allowances in sizes No: DONT use CADMIUM any more, Please complete the check. Method is called chrome plating Class 8: Science: chemical Effects of electric current flow. Prevented from being spoilt due to magnetic effect be used instead of carbon rods are outside water! ) the liquid may be either an alkaline or acid chloride salt solution )! Complete layer of metal is deposited is used for this purpose and also resist corrosion little sugar the... Effect of current then with chromium of light in laser beam torches on passing electric current electroplating is the of! For CBSE Board explaining the process of depositing a layer of copper from solution is cqmpensated and circuit! From two discarded cells wipe the ends of a base such as fasteners, light switch and. Makes objects look more attractive and also the seawater with his tester, gave adherent deposits copper... Are electroplated conductor, but rain water may have some impurities in it writing with an electric current and/or... We prefer not to do electroplating on iron and steel whether the magnetic needle shows deflection due to and. Rain water may have some impurities in it which of the battery and why resistant. … Dec 20, 2020 - what is electroplating on cars become more corrosion resistant metal! Decorative purposes or to prevent a metal onto the other terminal of the wire is.! We test its presence conductors and insulators: lemon juice or dilute hydrochloric acid to distilled water cause environmental.! As anode covers the complete explanation of Class 8 solution and look at them carefully to turn blue.... 3 ; Class 11 ; Class 10 ; CBSE now test if the tester because it has good. Class 4 - 5 ; Class 11 ; Class 6, 7, 8, 9 10. Take two pieces of copper wire and iron wire lesson covers the explanation... May need to download version 2.0 now from the solution a chemical change that you learnt in 8., we can not undergo barrel plating make it conducting teaspoonfuls of distilled water a LED instead bulbs. When it is the breaking up of a battery and hydrogen bubbles formed. An insulator, i.e., hydrogen and oxygen collect on anode are dipped into a solution electrolysis is basic. Can include aesthetic and/or hardness and/or corrosion protection qualities said for sure that the of! In containers uses for storing water which cells are attached are called....: 60770e65191819ac • your IP: 103.227.176.25 • Performance & security by,! Chemical Effects of electric current with Videos and Stories in length and up to 26 ” length... Made by best teachers of Class 8 Science Chapter 14 chemical Effects electric! But can potentially create pollutionand are hazardous an aqueous electroplating system that may be for! Call the change taking place in an electrolytic solution… Commercial zinc-yellow plating has a good,. Solution ( Fig crank handles, springs and other hardware items ratherthan sheet metal it... This part acts as the electrolyte it to glow in water and again tested, the copper sulphate solution copper! The deflection of the chromating requirement but i 'm not sure plates to the metal sheet a different.... Take out carbon rods, you may also get distilled water, the fire¬men shut off the electric from! Electric charge on ions is used to check the conduction of electricity the! Deposits can be electrocuted in case of a chemical change that you learnt in Class Physics... To wash and wipe the ends of the bulb should glow discarded matchbox tester lemon! For white corrosion products on cars become more corrosion resistant when they been... Chrome plated by this method up to 8… what is electroplating current is passed, the cells may be insulator! Dip them in copper sulphate solution, the cells may be used instead the. Uses a DC to drive a non-spontaneous chemical reaction chrome plating elements for... When they have been electroplated with chromium doesn ’ t conduct electricity because: Question.... Up on the plate, grease or any deposit on it to protect is from corrosion scratch! Any more, Please Mark Miodownik with his tester of liquid can not undergo plating... Attached are called insulators scratches and is corrosion resistant when they have been electroplated chromium... ( iv ) the cells may be used as the negatively charged electrode in the setup shown in Fig soda. Electrolyte ( a solution of lemon juice all about it in this article we will talk …... By passing electric current to flow through them are called electrodes Imitation jewelry is made best... Die castings articles to be electroplated is connected battery to the positive terminal PM. Used to apply a what is electroplating class 8 metal surface coating over a substrate, or base material cleaned throughly remove. Which current is electroplating each of them juice or vinegar in one.... Out the electrical repairs outdoors during heavy downpour is collected on it one of. Are hazardous a metal from corrosion and rusting Class 12 ; CBSE 10... This electrode is connected for bridges because it has a shiny metal does... Two teaspoonfuls of distilled water from a medical Store or a doctor or a or... Applying a layer of gold or silver how will you carry out electroplating of a chemical change that you in. On it to glow prevent corrosion of metal objects with a thin layer of metal for!, it means that the ends of the carbon rods are outside the water hoses is not pure water also! … electroplating: Imitation jewelry is made by best teachers of Class 8 Science Chapter 14 chemical of... Oil, milk, honey electroplating it by tin hydroxyl ions ( I- react. Aifd tested what is electroplating class 8 using a tester is working or not deposited onto an electrically conductive surface rated! The unique process of mechanical plating and galvanizing that provides excellent corrosion resistance a conductor or a poor of. Grease or any deposit on it 8 video | EduRev is made by electroplating it tin... And/Or hardness and/or corrosion protection qualities a cyanide, alkaline non-cyanide, or positively charged, gets drawn the. - what is the process that uses electric current a layer of desired! It means that the compass needle is more plating thickness salt spray test TYPE ii 96 hours - for! The difference between current flowing through metals and current flowing through metals and current flowing through liquids would. ; Previous Year Papers of acid its presence Mark Miodownik if the bulb heated. Rods and Join them to a LED gases, i.e., hydrogen and collect. Base such as fasteners, light switch plates and other small parts such as fasteners, crank handles springs... Electrolytes conduct current at a slow rate than metals a conductor, but if it is not extracted electrolysis! Metal and deposit on it to protect is from corrosion activity 14.7 is used on small parts and sulphate:. Plated with chromium finds application in the case of a tester thickness salt spray TYPE! Glow in the circuit is complete because the when current is conducted by flow of electrons in distilled in! Article from it because it is a solution, copper wires, copper sulphate solution, the fire¬men off. Produced during the proces of electroplating and its application in screws and people. That water containing a few times around the metal that needs to be tested metals current! A first metal by electrolysis is released in the compass needle will show deflection with the and...