To predict the products of the electrolysis of water based on the chemical composition of water 3. Draw a well labelled diagram for electroplating of copper on iron spoon. This observation, therefore, shows that electric current has a chemical effect on water. If you How will you carry out electroplating of copper in the laboratory? Observe the circuit given in Fig. A battery is commonly used to furnish the electricity for the process. Our body may get electric shock. Electrolyte is the solution of soluble salt of metal to be deposited. Answer 8 (a) Cathode (c) Conductor (b) Electroplating (d) Chromium. Class 8 Video | EduRev is made by best teachers of Class 8. Electroplating is a process that uses electrical current to reduce dissolved metal cations so that they form a coherent metal coating on an electrode 4. Chemical Effects of Electric Currents Class 8 Science Chapter 14 as per NCERT Book used in CBSE and other Schools. Why electric fires are extinguished with either using C02 extinguisher or mud but not water? The bulb does not glow in … Electroplating, process of coating with metal by means of an electric current. What is Electroplating and How is it Done? Class 8 Video | EduRev video for Class 8 is made by best teachers who have written some of the best DK, 2007/2016. Draw a circuit diagram showing a dry cell connected to a bulb through a switch. The electric current will break up tap water into its constituent gases, hydrogen and oxygen. It is then treated with acid, in order to remove any rust or surface scales. Do check out the sample questions of What is Electroplating and How is it Done? It is one of the most common applications of chemical effects of electric current. Boojho set up this circuit for purification of copper. Electroplating is a popular metal finishing and improving process used in a wide range of industries for various applications. Which of these do you think uses less electrical energy—electric bulb or LED? 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 ? NCERT Solutions for Class 8 Science Chapter 14 – 1 Mark Questions and Answers. 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. 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, Iron rod made as cathode and copper rod as anode and dipped into copper sulphate electrolyte. 4.8.4 The Hull Cell Test . The key process of electrolysis is the exchange of atoms and ions from the external circuit by removing or adding electrons. briefly explain the process of electroplating? Define electrolysis. It is deposited on other cheaper metals such as iron to make car parts, taps, bicycle handle bars, wheel rims, etc. Class 8 Science Chapter 14 Chemical Effects of Electric Current . 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. What happens when electricity is passed through tap water? The writing appears on the paper. All Living Science 2019 2020 Solutions for class Class 8 Science are prepared by experts and are 100% accurate. The object (iron spoon) to be electroplated is made cathode (–ve electrode). 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. Ans: As water is a good conductor of electricity we should not touch electrical appliances with wet hands. Class 8 Video | EduRev search giving you solved answers for the same. Pollutants from electroplating industries are very harmful. Sharretts Plating Company has been providing a wide range of industry-best metal finishing and plating solutions since 1925. They are used to store food. Substances that do not allow electric charges to flow through them are called non-conductors or insulators of electricity. Explain why the following are made of thermosetting plastics. Ans: Substances which allow electric charges to flow through them are called conductors of electricity. Electroplating accounts for 4–8% of worldwide Pd. Class-VIII . Question 1. To prevent this, iron is electroplated with tin, which is less reactive than iron, to make tin cans. 4.8 Electroplating Process Control and Chemical Analysis of Plating Solutions. Class 8 Video | EduRev images and diagram are even better than Byjus! Question 9. [3 Marks] The electrodes are immersed in an electrolyte (a solution 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. There are also specific types of electroplating such as copper plating, silver plating, and chromium plating. Using electricity, you can coat the metal of one electrode with the metal of the other with an electroplating process, also known as electrochemistry! So, go through the entire page & read it thoroughly for more clarification. By continuing, I agree that I am at least 13 years old and have read and agree to the. Why? The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. Question 1. You will also love the ad-free experience on Meritnation’s Living Science 2019 2020 Solutions. Save my name, email, and website in this browser for the next time I comment. What is electric current? You can download Free What is Electroplating and How is it Done? After doing Activity 5 (electroplating a spoon with copper), a student interchanged the connections of the copper plate and the spoon. The teapot acts as the cathode and a bar of silver acts as the anode. Thus, iron spoon gets plated with copper. Despite the popularity of electroplating, however, very few outside of the industry are familiar with the process, what it is and how it works. The phase diagram of Pd and hydrogen is seen in. A coating of zinc is provided to protect iron from corrosion and rust. Electroplating is the process of plating one metal onto another by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. [NCERT]. and ………….. 6 Uterus 1 1 7. 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 ? please explain the process briefly. (iii) Food kept in iron cans gets spoilt because of reaction with iron. Electroplating. The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. Class 8 Video | EduRev for Class 8 this is your one stop solution. 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. 2. [2 Marks] 10. Draw a well labelled diagram for electroplating of copper on iron spoon. Short Q&A: Q1: Differentiate between good conductors and bad conductors of electricity. Class 8 Video | EduRev sample questions with examples at the bottom Dec 20, 2020 - What is Electroplating and How is it Done? 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 experimental set-up for electroplating copper on an iron spoon is shown in Fig. Good conductors are those conductors that allow current to pass through them. of current flow Object to be plated (a) Copper(b) Alcohol(c) Dilute sulphuric acid(d) VinegarAnswer:(b), Question 3.The electrode, connected to the positive terminal of a battery, is called(a) anode(b) pole(c) cathode(d) photodiodeAnswer:(a), Question 4.A metal is released in the electrolysis of a salt. [2 Marks] SECTION –B 9. of this page. Oct 26, 2013. briefly explain the process of electroplating? Best example of electroplating can be seen on artificial jewellery. There is no scarcity of C u atoms because the copper atoms go into the solution from the positive terminal i.e. 3. Soln: i) In plate A- Pure copper Do you agree? Boojho set up this circuit for purification of copper. NCERT Solutions for Class 8 Science Chapter 14 – 3 Mark Questions and Answers. Your email address will not be published. For example: All metals including metal wires, copper wires, aluminium foil, etc. 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. 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. Mercury is a liquid and conducts electricity. Class 10 Class 12. Class 8 Video | EduRev chapter (including extra questions, long questions, short questions) can be found Better than Byjus circuit diagram showing a dry cell connected to the metal sheet salt or a drops. Type i ) chromium is a shiny appearance the objects like water taps and cycle bell to give them layer... Terminal of battery to the metal sheet VIII Board Examination, but when is... 15 - chemical Effects of electric Currents shown in the laboratory current with Videos Stories! 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