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Electroplating of Fe is less important than Ni and Co, due to the limited corrosion resistance, even if its cost is lower. Connect the negative terminal of battery to the metal sheet. Question 1. The Guardian, April 29, 2015. It makes iron look more attractive and also resist corrosion. Electroplating is basically the process of plating a metal onto the other by hydrolysis mostly to prevent corrosion of metal or for decorative purposes. What are the advantages of electroplating iron with chromium? When current passes through copper sulphate, it splits up into ions Cu+2 and SO4-2 . Electroplating is done in industries to have an anti-reactive coating on the parts of machines so that they do not react with the raw material, to have an anti-corrosive coating for the machines so that they do not get corroded, and a heat-resistive coating for parts like boilers to … The temperature around the electroplating equipment should be optimum. The object (iron spoon) to be electroplated is made cathode (–ve electrode). 6 Uterus 1 1 7. Observe the circuit given in Fig. CLASS: VIII SUBJECT: SCIENCE Q.No. EXPLORE THE MANY BENEFITS THAT ELECTROPLATING CAN PROVIDE FOR YOUR BUSINESS. Class 8 Video | EduRev Summary and Exercise NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. Class 8 Video | EduRev for Class 8, the answers and examples explain the meaning The teapot acts as the cathode and a bar of silver acts as the anode. A general children's introduction to chemistry, focused on the elements, for ages 8–10. Class 8 Video | EduRev images and diagram are even better than Byjus! Class 8 Video | EduRev notes & Videos, you can search for the same too. Solid copper sulphate does not conduct electricity, but when it is dissolved in water, it does conduct electricity. Ans: The flow of electronic current is from negative to positive whereas the flow of conventional current is from positive to negative. NCERT Exemplar Class 8 Science Chapter 14 is a free resource which is very helpful while preparing for your upcoming board examination. [2 Marks] 8. Electrolyte is the solution of soluble salt of metal to be deposited. What are conductors ? 8. This observation, therefore, shows that electric current has a chemical effect on water. Class-VIII . What is Electroplating? 4. Soln: i) In plate A- Pure copper You can also find What is Electroplating and How is it Done? This experiment shows that an electric current can bring about a chemical change. Revision worksheets, Sample papers, Question banks and easy to learn study notes for all classes and subjects based on CBSE and CCE guidelines. 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. [2 Marks] 8. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. 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. All questions and answers from the Living Science 2019 2020 Book of Class 8 Science Chapter 15 are provided here for you for free. The method of coating one metal over another by use of electric current is known as electroplating. of chapter in the best manner. A materials scientist extolls the virtues of electroplating. What will be the nature of – (i) plate A (ii) plate B (iii) the solution. 4.8 Electroplating Process Control and Chemical Analysis of Plating Solutions. This process called electroplating continues until the iron spoon gets coated with copper. thumb_up Like (2) visibility Views (2.2K) ... Q17: Explain the process of electroplating… The experimental set-up for electroplating copper on an iron spoon is shown in Fig. Electroplating accounts for 4–8% of worldwide Pd. Dec 08, 2020 - Process of Electroplating - Chemical Effects of Current, Science, Class 8 Class 8 Video | EduRev is made by best teachers of Class 8. 2. Question 1. A battery is commonly used to furnish the electricity for the process. Liquid B is a better conductor than liquid A. Ans: 2. This results in a chemical change. Ans: NCERT Science textbook for Class 8 is designed exceptionally well for Class 8 students. 14.8. Mark the positive and the negative terminals of the cell, and the direction of flow of a. electron, b. Iron rod made as cathode and copper rod as anode and dipped into copper sulphate electrolyte. Electroplating is the application of electrolytic cells in which a thin layer of metal is deposited onto an electrically conductive surface. NCERT Exemplar for Class 8 Science Chapter 14 Chemical Effects of Electric current 20. NCERT Solutions for Class 8 Science Chapter 14 – 3 Mark Questions and Answers. Discuss what happens when an electrolyte is dissolved in water, and then an electric current is passed through it. Explain the process of purification. Electroplating Example . NCERT Solutions for Class 8 Science Chapter 14 – 3 Mark Questions and Answers. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.The voltage that is needed for electrolysis to occur is called the decomposition potential. 7. All Living Science Solutions for class Class 8 Science are prepared by experts and are 100% accurate. books of Class 8. please explain the process briefly. [2 Marks] 10. Ans: Yes, I agree with this statement that copper conducts electricity through electrons, whereas salt solution conducts electricity through ions. are very important for perfect preparation. The articles to be plated should be cleaned throughly to remove dust, grease or any deposit on it. In each case observe whether the magnetic needle shows deflection or not. A cell consists of two electrodes (conductors), usually made of metal, which are held apart from one another. The bulb does not glow in … For example: All metals including metal wires, copper wires, aluminium foil, etc. In an acid type bath, the solution is made of 150 – 200 gm of copper sulfate and 25 – 35 gm of sulfuric acid per 1000 cc of solution.Deposit obtained is thick and rough requiring polishing. The iodide ions (I- ) react with starch to turn blue black. Cu+2 move towards cathode to gain electron and neutralize as cu and form layer over iron. Class 8 Video | EduRev sample questions with examples at the bottom 3. Why is a layer of zinc coated over iron? Observe the circuit given in Fig. Soln: i) In plate A- Pure copper want What is Electroplating and How is it Done? This happens because the when current is passed, the K+ ions are attracted to the metal sheet. Examples: Metals like iron, copper, aluminium, etc. [2 Marks] SECTION –B 9. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it. Question 1. 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. Record your observations in Table 14.1. You will also love the ad-free experience on Meritnation’s Living Science Solutions. Electrolytes conduct current at a slow rate than metals. Give some applications of electroplating. Use plating artificial jewellery with gold. This makes them look more attractive and also resist corrosion. FREE Living Science for class 8 Science, Chapter 15 - Chemical Effects Of Electric Current from (Living Science). Ans: Solid copper sulphate does not contain any free electrons or ions to conduct electricity. Stainless steel revolutionised eating after centuries of a bad taste in the mouth by Mark Miodownik. Class 8 Video | EduRev video for Class 8 is made by best teachers who have written some of the best So, go through the entire page & read it thoroughly for more clarification. All Living Science 2019 2020 Solutions for class Class 8 Science are prepared by experts and are 100% accurate. Define Electroplating and understand it using an activity. Electrolysis is a method that uses a DC to drive a non-spontaneous chemical reaction. will not be affordable if made of chromium entirely. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Ans: When an electrolyte is dissolved in water, it breaks up into cations (positively-charged ions) and anions (negatively-charged ions). Why? Figure 12.7. Our body may get electric shock. Explain the electroplating of copper on an iron spoon. The key process of electrolysis is the exchange of atoms and ions from the external circuit by removing or adding electrons. Home » Class 8 » Chemical effect of electric current » Electroplating. [2 Marks] 10. Electroplating is a very useful process. The electrodes are immersed in an electrolyte (a solution Oct 26, 2013. briefly explain the process of electroplating? It is analogous to a galvanic gll acting in reverse. Good conductors are those conductors that allow current to pass through them. Question 1. Mercury is a liquid and conducts electricity. 3. POWER POINT PRESENTATION BASED ON ELECTROPLATING 2. i@% 3. When it is dissolved in water it breaks up into ions that can conduct electricity. Electroplating! Chemical Effects of Electric Current . 3. 1. Artificial jewellery is plated with silver or gold. This video is highly rated by Class 8 students and has been viewed 731 times. We should not try to put out a fire in an electrical appliance by pouring water on it. Science . Best example of electroplating can be seen on artificial jewellery. Explain the process of purification. OBSERVATIONS Data Table 1. Ans: If after electroplating a spoon with copper, the connections of the copper plate and the spoon are interchanged, the copper deposited on the spoon will start disappearing and going into solution. So the objects like car parts, taps, cycle parts, etc. Electroplating. Articles Modern plating. Take water in a beaker and add to it a little salt or a few drops of sulphuric acid to make it conducting. To Study What is Electroplating and How is it Done? 2. This phenomenon is called electrolysis. electroplating. 14.8. It has gotten 903 views and also has 4.7 rating. In Grade 8, learners will practice drawing electrical circuits using the correct circuit symbols. LEDs emitting white light can be used instead of bulbs. NCERT Exemplar for Class 8 Science Chapter 14 Chemical Effects of Electric current 20. After doing Activity 5 (electroplating a spoon with copper), a student interchanged the connections of the copper plate and the spoon. ... Let us suppose that in the process of electroplating of copper on a metallic spoon, the iron spoon is made the cathode. Immerse the nails (called electrodes) in the solution. 4.8.3 Cathode Efficiency and Anode Efficiency. may be the current is so weak that it does not heat the filament of the bulb allowing it to glow. Answer: Class 8 Video | EduRev pdf from It includes many interesting as well as important chapters to expand the horizons of knowledge. Through diagram represent movement of ions during electrolysis. A coating of zinc is provided to protect iron from corrosion and rust. Value Points/Expected Answer Marks Distribution Total Marks I.1. Gradually, a layer of copper builds up on the plate. The silver bar furnishes the silver ions that are reduced onto the surface of the teapot. Hence it is not an electrolyte. 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. 6. and ………….. Instead of taking the trouble of electroplating metals with chromium for making car parts, taps, cycle parts, etc., why are these objects not made of chromium itself? 3. They are used to store food. Write one important application of electrolysis in our daily life. Ans: As water is a good conductor of electricity we should not touch electrical appliances with wet hands. Observe the nails carefully. Clean them with sand paper. Read more about the Applications of Electrolysis for IIT JEE (Main and Advanced) at Vedantu.com. Question 10 Copper conducts electricity through electrons, whereas salt solution conducts electricity through ions. When electric current is passed through the solution, the cations move towards the cathode (negatively-charged electrode) and the anions move towards anode (positively-charged electrode). Observations of Electroplating Time of Observation Observations of the Object being plated After several min. To predict the products of the electrolysis of water based on the chemical ... Use a diagram to illustrate the movement of ions in electroplating. D SHORT-ANSWER QUESTIONS (TYPE II): Answer in about 30 words. Write on the paper with the end of the wire connected to the positive terminal. Electroplating is the process of depositing a thin film of one metal over another metal by passing electric current through an electrolyte. Thus, iron spoon gets plated with copper. Plating metal may be transferred to conductive surfaces (metals) or to nonconductive surfaces (plastics, wood, leather) after the latter have been rendered conductive by such processes as coating with graphite, However, Fe Ni alloys can be electroplated to form very soft magnetic materials with extensive uses in magnetic and electronic applications at microscale, such as transformers, inductors, and electromagnets. how_to_reg Follow . 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. It gets deposited on the(a) anode(b) cathode(c) half on the anode and half on the cathode(d) sides of the containerAnswer:(b), Question 5.Distilled water is a(a) conductor(b) insulator(c) semi-conductor(d) semi-insulatorAnswer:(b), Question 6.A cell is an example of conversion of(a) magnetic energy into chemical energy(b) electrical energy into chemical energy(c) chemical energy into electrical energy(d) chemical energy into magnetic energyAnswer:(c), Question 7.Which one of the following is a weak electrolyte ? By continuing, I agree that I am at least 13 years old and have read and agree to the. Question 7 With the help of a labelled diagram ,describe how an iron key can be electroplated with copper? To predict the products of the electrolysis of water based on the chemical composition of water 3. Class 8 What is Electroplating and How is it Done? Prachi Chugh. This is your solution of What is Electroplating and How is it Done? Take a filter paper soaked in potassium iodide solution to which a pinch of starch is added. (Remember to wash and wipe the ends of tester after testing each liquid). To understand how the laws of attraction govern the formation of ions and molecules 2. The process used in electroplating is called electrodeposition. Class 8 Video | EduRev is made by best teachers of Class 8. Do you agree? Chemical Effects of Electric Current - Chapter Wise CBSE Solved Question and Answer Based On NCERT. Ans: Zinc is electroplated on iron to prevent it from rusting. Pollutants from electroplating industries are very harmful. of current flow Object to be plated Ans: Take two iron nails. 8.6 Copper Plating & Electrolysis Objectives: 1. 2. LEDs emitting white light can be used instead of bulbs. Draw a suitable diagram also. 4.8.6 Process Monitoring Explain why the following are made of thermosetting plastics. NCERT Solutions for Class 8 Science Chapter 14 – 1 Mark Questions and Answers. It can be checked that the gases evolved are hydrogen and oxygen. Visit to know more. Testosterone 1 1 8. (iii) Food kept in iron cans gets spoilt because of reaction with iron. EduRev is like a wikipedia just for education and the What is Electroplating and How is it Done? 5. Over the years, we have developed and perfected our industrial electroplating processes that make use of various metals and metal alloys to achieve the desired result for our customers. Lakhmir Singh Science Class 8 Chapter 14 Multiple Choice Questions (MCQs) Question 46. It is one of the most common applications of chemical effects of electric current. Conduct copper plating activity. Substances that do not allow electric charges to flow through them are called non-conductors or insulators of electricity. Prevalence of Cyanide Electroplating Facilities with Class I Violations 16 14 12 10 8 6 4 2 0 02-03 03-04 04-05 05-06 Fiscal Year No. All questions and answers from the Living Science Book of Class 8 Science Chapter 15 are provided here for you for free. Ans: Substances which allow electric charges to flow through them are called conductors of electricity. The apparatus is shown in the figure given below. Dec 20, 2020 - What is Electroplating and How is it Done? consumption. Explain why plastic containers are favoured for storing food. iron spoon and gets deposited on it. Boojho set up this circuit for purification of copper. There is no scarcity of C u atoms because the copper atoms go into the solution from the positive terminal i.e. Post-test (10 min.) What will be the nature of – (i) plate A (ii) plate B (iii) the solution. Dec 20, 2020 - What is Electroplating and How is it Done? Mark the positive and the negative terminals of the cell, and the direction of flow of a. electron, b. conventional current. It is then treated with acid, in order to remove any rust or surface scales. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. Class 10 Class 12. Ans: Mercury is a metal which is liquid at room temperature. 4.8.4 The Hull Cell Test . Electroplating. Electroplating is a very useful process. Your email address will not be published. Class–VIII Science (Chemical Effects of Electric Current) ... Electroplating v) negatively charged ions. Ans: Uses of electroplating: (i) Chromium is a shiny metal that does not corrode and resists scratches. (ii) Gold or silver is electroplated on jewellery made out of a cheaper metal to make it look attractive. Question 9. 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