Can you explain the reason? Maths Students who are looking for better solutions, they can download Class 8 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. Repeat the activity with other liquids such as tap water, vegetable oil, milk, honey. Answer: Materials which allow electric current to flow through them are called conductors. [NCT 2011] Electrolysis is the breaking up of a compound from its solution on passing electric current through the electrolyte. Can we call the change taking place in the solution a chemical change? Deposits can be seen in containers uses for storing water. Why are LEDs more useful for testing the flow of electric current ? Chemical Effects of Electric; Electroplating. On passing electric current through the conducting solution of lemon juice and water, chemical reaction takes place. 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List the possible reasons. LED glows showing the flow of current. Now repeat Activity 14.2 using this tester. Question 8. The free copper gets deposited on the plate acting as cathode. Answer: LED is a device in which the two terminals inside the glass bulb are connected together with a metallic point of Galluim Arsenide. To her surprise, she found that the compass needle showed deflection. Question 11. (c) liquids only. 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. (d) electroplating. (b) cathode Answer: CBSE Class 8 Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources – Detailed explanation of the chapter ‘Land, Soil, Water, Natural Vegetation and Wildlife Resources’ along with question answers. The decomposition of an electrolyte when electricity is passed through it, is called Answer: Artificial jewellery is plated with silver or gold. Air is an insulator of electricity. needle the moment you dip the free ends of the tester in lemon juice? Question 2. (ii) liquid B is a better conductor than liquid A. Video Format solutions of all chapters are also available. What are insulators ? 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. Therefore, we can be electrocuted in case we touch appliances with wet hands. (b), Question 3. Chapter 3: Synthetic Fibres and Plastics. Answer: (a) anode Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. How are bridges and automobiles prevented from rusting ? Question 4. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. NCERT Solutions Class 8 Science Chapter 18 Pollution of Air and Water – Here are all the NCERT solutions for Class 8 Science Chapter 18.This solution contains questions, answers, images, explanations of the complete chapter 18 titled Pollution of Air and Water From of Science taught in class 8. [NCERT] Dissolve two teaspoonfuls of copper sulphate in it. Which properties of chromium make it useful for electroplating on iron ? (b), Question 8. CBSE Topper Answer Sheet; CBSE Sample Papers for Class 12; CBSE Sample Papers for Class 11; ... NCERT Solutions for Class 10 Science Chapter 14; ... RD Sharma Class 8: RD Sharma Class 7: CBSE Previous Year Question Papers Class 12: CBSE Previous Year Question Papers Class 10: NCERT Books: Maths Formulas: CBSE Sample Papers: Vedic Maths . Electric charge on ions is used for writing with an electric pen. Your tester with two free ends of the wire is ready. If the magnetic compass shows deflection glows, it is a conductor, but if it does not deflect, it is an insulator. Place them in fresh lemon fruit. Answer: Noise pollution, its causes, impacts, and control measures are explained towards the finish off the chapter. We have Provided Motion Class 9 Science MCQs Questions with Answers to help students understand the concept very well. Question 10. Browse further to download free CBSE Class 8 Science Worksheets PDF. Answer: Does pure water conduct electricity ? Question 2. Answer: Answer: After the electroplating of a spoon with silver, it was found that the anode has become thin. NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. Leave your worries of acing the exams and refer to these guides to understand difficult concepts of Chemical Effects of Electric Current with ease. Answer: Take two pieces of copper wire and iron wire. He finds that the compass needle deflects more in the case of seawater. Electroplating. Oxygen bubbles are formed on the electrode connected to the positive terminal of the battery and hydrogen bubbles are formed on the other electrode. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (c), Question 7. When electric current is passed in water hydrogen ions (H+) move towards cathode and get collected over it. Liquid A is a better conductor of electricity because the bulb glows more in it. (d) electro refining Give three applications of chemical effect of current. Activity 6 (NCERT Textbook, Page 176) Question 4. LEDs emitting white light can be used instead of bulbs. Revise concepts such as synthetic fibres and types of synthetic fibres … Good/Poor Conducting Liquids. Question 2. Compact Fluorescent Lamps. Dinesh can study the chemical effect of current at home very easily. LED is Light Emitting Diode. This shows that distilled water does not conduct electricity. NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current The sea water contains more salts dissolved in it as compared to the tap water. Answer: Dinesh is wants to study the chemical effect of current at home. (a) gases only. What are good conductors? Iron is a strong metal used for making bridges. Answer: Name one non-metal which a good conductor of electricity. NCERT Solutions for Class 8 Science Chapter 14 – 1 Mark Questions and Answers. [NCERT]. Question 17. Now rinse them with water and dry them. Does lemon juice or vinegar conduct electricity? (d) Nitric acid In containers, water evaporates slowly. 14.6. The lesson covers the complete explanation of class 8 Chapter 9 Reproduction. synthetic fibres and plastics class 8 notes. Do you find any difference in any one of them? Answer: Question 11. This process is known as chemical effects of current. Apart from chemical effect, which other effect electric current produce ? Answer: Answer: Tin is less reactive than iron. Answer: Answer: Electric current can produce magnetic effect also. (b) coating [NCT 2011] The iodide ions (I- ) react with starch to turn blue black. Answer: Note down the terminal of the battery with which this electrode is connected. First and second cap with acid and base respectively, conducts electricity whereas third cap having sugar dissolved in distilled water do not conduct electricity. 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. (a), Question 4. The free copper, being positively charged, gets drawn to the negative terminal of the battery and gets deposited on it. Answer: Extra Questions for Class 9 Science Chapter 10 Gravitation with Answers Solutions. It is very important for the student to tune-in with this topic in order to understand the topics of the higher class. Question 11. Answer: The rainwater showed deflection with the tester because it is not as pure as distilled water. Pour a cupful of water in a glass/ plastic bowl. Add a few drops of lemon juice or dilute hydrochloric acid to distilled water in one cap. Wrap an electric wire a few times around the tray. The NCERT Class 8 Science important questions come from this chapter. 14.3). How should LED be connected ? What colour is the coating? Electrolytes conduct current at a slow rate than metals. Compass needle shows deflection due to magnetic effect of electric current. (c), Question 2. 14.2). We can test the presence of the small current by using a LED instead of the bulb. Living Science 2019, 2020 Solutions for Class 8 Science Chapter 14 - Some Natural Phenomena Living Science 2019, 2020 Solutions for Class 8 Science Chapter 15 - Chemical Effects of Electric Current Living Science 2019, 2020 Solutions for Class 8 Science Chapter 16 - Reflection of Light In Class 8 Science Chapter 3, the descriptions of man-made fires and their uses are given. Answer: Answer: Also Read : – Class 6 Science NCERT Solution NCERT Class 6 Science Chapter 14 […] Question 3. What results do you obtain? The thick rod of impure copper plate is to be attached to the positive terminal of the battery because when electric current is passed through the copper sulphate solution, it gets dissociated into copper and sulphate. Now, check the Class 8 Science Chapter 14 question answer PDF on the main website of Vedantu. What precautions should be observed when doing electroplating ? We prefer not to do electroplating on iron used for bridges because it is very costly. Moreover, students will also learn about the dangerous effects of electricity and how it can harm us. You can understand how light travels and how you can split and converge white light. Does the bulb of the tester glow? The Sound Class 8 NCERT solutions provide questions and answers from the NCERT books in a very detailed way. The free copper gets drawn to the plate connected to the negative terminal of the battery and gets deposited on that plate. Refining of metal are for obtaining pure metal. Take out the ends of the tester from the lemon juice, dip them in water and then wipe them dry. 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. NCERT Solutions for Class 8 Science Chapter 8 Cell-Structure and Functions English and Hindi Medium (Adhyay 8: Koshika – Sanrachana evam Prakarya) to Study online or View in Video Format or download free in PDF file free for session 2020-2021. (b), Question 6. Question 5. Yes, the solution does conduct electricity. Why? How can the magnetic effect be used as a tester ? Wait for 3-4 minutes. Or, the bulb is fused? Question 5. Water is a solution of salts and so it is a good conductor of electricity. Take the tray from inside a discarded matchbox. Do you notice any gas bubbles near the electrodes? A cell is an example of conversion of (b) pole The Class 8 Science Chapter 14 Solutions are now made easy to understand all the concepts and topics related to the chapter precisely. No, it is not advisable for electrician to carry out electrical repairs during heavy downpour because water is a good conductor of electricity and the person can get shock. Classify the following liquids into conductors and insulators : lemon juice, , distilled water, tap water, milk. Most liquids that conduct electricity are solutions of …………, ………. The passage of an electric current through a solution causes ……………….. effects. Answer: Check the below NCERT MCQ Questions for Class 8 Science Chapter 13 Sound with Answers Pdf free download. Question 3. If you are a student of class 8 who is using NCERT Textbook to study Science, then you must come across chapter 14 Chemical Effects of Electric Current . List the possible reasons. So, the fire¬men shut off the electric supply before spraying water to save themselves and other people from electrocution. Can you ex¬plain the reason? NCERT Solutions for Class 8 Maths Chapter 14 Factorisation. Activity 2 (NCERT Textbook, Page 773) If not, what can we do to make it conducting ? You can refer to NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current to revise the concepts in the syllabus … Answer: Question 1. Solution: NCERT Solutions of Class 8 Science of Chapter 13 includes solutions of all 10 questions given in your NCERT book. (b) solids only. You will also love the ad-free experience on Meritnation’s Living Science 2019 Solutions. Notes & Worksheet. Question 1. If it is still not working then replace the cells with fresh cells. Question 5. . When People Rebel Class 8 Extra Questions and Answers Social Science History Chapter 5 CBSE Pdf free download are part of Extra Questions for Class 8 Social Science.Here we have given NCERT Extra Questions for Class 8 Social Science SST History Chapter 5 When People Rebel. Why ? Take another piece of wire and connect it to the other terminal of the battery (Fig. Why is chromium used for electroplating ? Question 21. Which of the following metal is not extracted by electrolysis? (a) acids, bases, salts Now remove the electrodes from the solution and look at them carefully. Which is the most common application of chemical effect of current ? (d) chemical energy into magnetic energy Solution: Question 8. Answer: Chemical Effects of Electric Current Class 8 Extra Questions Science Chapter 14 Chemical Effects of Electric Current Class 8 Extra Questions Very Short Answer Questions Question 1. Why should you not do the experiments on electricity by using electric supply from mains ? Question 7. Answer: In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. What is electrolysis ? (c) half on the anode and half on the cathode Question 1. If the current in the circuit is small, how can we test its presence ? If they are, then replace the bulb with another bulb. Take out carbon rods carefully from two discarded cells. Why should you not touch electrical appliances with wet hands ? Allow the current to pass for about 15 minutes. Why ? Method : Question 2. Answer: Question 7. Does distilled water conduct electricity? All Living Science 2019 Solutions for class Class 8 Science are prepared by experts and are 100% accurate. Do you find a coating over it? Answer: Students of class 8 will be writing national level exams … Answer: The substances that conduct electricity through them are called good conductors. Explain your answer. Explain why they do this. No, pure water doesn’t conduct electricity. Therefore, it becomes thin. Pour one teaspoon of lemon juice or vinegar in one cap. Question 1. Do Liquids Conduct Electricity? So she collected some rainwater in a clean glass tumbler and tested it using a tester. Liquid B is a better conductor than liquid A. Question 13. Answer: A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Answer: Answer: Answer: Question 3. Answer: Now, check the Class 8 Science Chapter 14 question answer PDF on the main website of Vedantu. But the bulb does not glow. Question 3. So she collected some rainwater in a clean glass tumbler aifd tested it using a tester. (c) negative Answer: What are insulators or poor conductors? Gradually, a layer of copper builds up on the plate. Now that you are provided all the necessary information regarding CBSE Class 8 Science Worksheet and we hope this detailed article is helpful. How can he do it ? In case of a fire, before the firemen uses the water hoses, they shut off the main electrical supply for the area. Protection of the surface of bases metals which corrode for e.g., iron is plated with chromium. The Class 8 Science Chapter 14 Solutions are now made easy to understand all the concepts and topics related to the chapter precisely. Answer: ( ) (b) … and ………….. Question 13. In each case observe whether the magnetic needle shows deflection or not. (a) Copper 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. What is the basic principle of electric pen ? During electrolysis of water, why does hydrogen collect on cathode and oxygen collect on anode ? Question 1. You can now go through the concise explanations offered in these, to get the utmost clarity on different concepts under the chapter Chemical Effects of Electric Current. Collect a few small plastic or rubber caps of discarded bottles and clean them. Hydroxyl ions (OH )move towards the anode and oxygen is collected on it. Activity 4 (NCERT Textbook, Page 175) Answer: Copper from impure rod is sought to be transferred to the thin copper plate. The filament of the bulb is heated due to current and then it glows. Distilled water is a What are insulators ? The salts separate out and deposit on the sides of the container. If the tester is put in distilled water, the bulb of the tester does not glow. 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. Answer: (c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ________ terminal of the battery. Prepare a list of objects around you that are electroplated. Now dissolve a pinch of common salt in distilled water. 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. [NCERT] Question 1. What is LED? The bulb does not glow even though the circuit is complete because the current is too small. Question 9. Name three liquids, which when tested in the manner shown in Fig. (i) liquid A is a better conductor than liquid B. This solution contains questions, answers, images, explanations of the complete chapter 14 titled Chemical Effects of Electric Current From of Science taught in class 8. When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Paheli had heard that rainwater is as good as distilled water. 14.4). Answer: You may also get distilled water from a medical store or a doctor or a nurse). Pour about two teaspoonfuls of distilled water in each of them. Place a small compass needle inside it. Sorry!, This page is not available for now to bookmark. Or, your cells are used up? Question 14. Jake three clean plastic or rubber caps of bottles. What can be the possible reasons for this ? Jaya sets up a circuit as given below. What do you find? The writing appears on the paper. This solution for Class 8 Science Chapter 8 has answers to all the questions present in Chapter 8. Class 8 Science Chapter 14 Chemical Effects of Electric Current Thus water which is free of salts are poor conductors while water with salts is a good conductor of electricity. If the ends of the wire of tester are touched for a long time, what will happen ? A child staying in a coastal region tests the drinking water and also the seawater with his tester. The electrode, connected to the positive terminal of a battery, is called This chapter will strengthen your base for future complex topics. (c) electrolysis Question 10. Class 8 Science Chapter 13 Sound. Attach the free ends of the wires to a LED. To her surprise she found that the compass needle showed deflection. Explain your answer. A tester is used to check the conduction of electricity through two liquids, labelled A and B. We will need copper sulphate and two copper plates of size around 10 cm x 4 cm. Solution: Electroplating is the process of depositing a thin film of one metal over another metal by passing electric current through an electrolyte. Answer: Answer: Use the tester to test whether distilled water conducts electricity or not. Here is the list of Extra Questions for Class 8 Science with Answers based on latest NCERT syllabus prescribed by CBSE. (c) Sodium The process of depositing a layer of any desired metal on another material by means of electricity is called …………. (i) liquid A is a better conductor than liquid B. Solution: Record your observations in Table 14.1. Activity 7 (NCERT Textbook, Page 177) Question 9. Question 11. (c) cathode Question 1. Which one of the following is a weak electrolyte ? We have provided Sound Class 8 Science MCQs Questions with Answers to help students understand the concept very well. The disposal of the used conducting solution after electroplating is hazardous and can cause environmental pollution. Chapter Wise CBSE Science Class 8 … The compass needle should show deflection. Question 20. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. … What are conductors ? Answer: Graphite. The bulb does not glow in the setup shown in Fig. What is the objective of electroplating ? How can you make a tester for testing whether a given material is a conductor or an insulator ? 14.5. may cause the magnetic needle to deflect. Class 8 Science Chapter 15 Answers NCERT Solutions for Class 8 Science Chapter 15 Some Natural Phenomena is given below in updated form for session 2020-21. (ii) The bulb may be fused. The deflection in magnetic needle shows that the circuit is complete and the solution conducts electricity, i.e., it is a good conductor. Answer: (a) Most liquids that conduct electricity are solutions of ______ , ______ and ______ We call these two rods electrodes. Which electrode should be attached to the positive terminal of the battery and why? Question 8. (b) Alcohol Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. But when salt is dissolved in distilled water and again tested, the bulb glows which shows that water containing salts conduct electricity. Subtopics of Class 8 Science Chapter 14 Chemical Effects of Electric Current. Now test if the tester is working or not. What is the difference between current flowing through metals and current flowing through liquids ? This completes the circuit of the tester and the bulb should glow. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. What are electrodes ? Is air an insulator or conductor of electricity ? He finds that the compass needle deflects more in the case of seawater. Define the following terms. The compass needle will show deflection with tap water, lemon juice and sodium chloride solution. Answer: Given here is the complete explanation of the lesson, along with all the exercises, Question and Answers given at the back of the lesson. (iv) conducting properties of liquid cannot be compared in this manner. (c) chemical energy into electrical energy Question 14. Instead the iron can be galvanised or painted. Check that all the connections are tight. Class 8 is one of the crucial stages of a student’s life. Answer: (a) magnetic energy into chemical energy Test which solutions conduct electricity and which do not. Answer: as a point source of light in laser beam torches. Clean copper plates with sand paper. The process that you saw in Activity 14.7 is used for purification of copper. Conducting properties of liquid cannot be compared in this manner. Question 7. Explain why these deposits occur. How would you classify lemon juice or vinegar—a good conductor or a poor conductor? By volume of hydrogen gas is twice the volume of oxygen gas. Class 8 Science Chapter 14 MCQ with Answers 1. NCERT solutions Class 8 Science Chapter 13 provided by Vedantu offers proper guidance for the students. The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. Answer: LEDs require very little energy and glow even if a small current is passing through the circuit. Why ? Make sure that the metal caps of the carbon rods are outside the water. Again test. Chromium has a good shine, it resists scratches and is corrosion resistant. Class 8 Science Chapter 8 cell structure and functions is a very important topic as it is basic for all the biological studies. Activity 1 (NCERT Textbook, Page 173) Use plating artificial jewellery with gold. Class 9 Science Chapter 10 Extra Questions and Answers Gravitation. Solution: (Instead of carbon rods, you may take two iron nails about 6 cm long.) (d) sides of the container Bridges and automobiles are prevented from rusting by plating them with zinc. Firemen shuts off the main electrical supply for the area because water is a good conductor of electricity and the firemen can get electrocuted. (a) Sea water The water used in the water hoses is not pure water and is a good conductor of electricity. Conductors : lemon juice, tap water. It cannot be said for sure that liquid does not conduct electricity because : Question 2. No, it is highly dangerous to carry out the electrical repairs outdoors during the heavy downpour. If the ends of the wire of tester are touched for a long time, the cells will be finished very soon. Solution: Vedantu is a platform that provides free NCERT Solution and other study materials for students. Answer: Changes of colour of solutions may occur depending on what solution and electrodes are used. Objective Questions existing will help in scoring well in the board exams as they are highly scoring and give you an extra edge to … Sound talks about the distinction between music and noise. Class 8 NCERT exercise wise questions and answers will help students frame a perfect solution in the Maths Exam. After removing the electrodes from the solution, we find that copper metal gets deposited on the plate at the negative of the battery. Synthetic Fibres and Plastics. Question 18. Write its one use. Question 16. Mark ‘T’ if the statement is true and ‘F’ if it is false. A tester is used to check the conduction of electricity through two liquids, labelled A and B. Clean their metal caps with sand paper. Answer: The substances that […] (b) insulator Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect. (i) The wires in the circuit may be loosely connected. Explain how it can be used for writing. The bulb in the tester does not glow when current is passed through it. Answer: Answer: Answer: During electroplating, the silver metal from the anode is deposited on the cathode. (b) The passage of an electric current through a solution causes _______ effects. (iii) both liquids are equally conducting. If the tester is working, it can be used to test the materials, i.e., whether it is a conductor or non-conductor of electricity. What is electroplating? CBSE Science Class 8 Chapter Wise Solved Q&A . You can now go through the concise explanations offered in these NCERT Solutions for Class 8 Science to get the utmost clarity on different concepts under the chapter Chemical Effects of Electric Current. The two free ends of wire are connected to the material to be tested. Question 2. Question 4. [NCERT] In this activity the bulb glows which shows that lemon juice and vinegar both conducts electricity, hence they are good conductors of electricity. Gravitation Class 9 Extra Questions Very Short Answer Type. [NCERT] So, the compass needle showed deflection. Materials which do not allow electric current to flow through them are called insulators. Question 3. (iii) The cells may be used up. Take a filter paper soaked in potassium iodide solution to which a pinch of starch is added. Activity 3 (NCERT Textbook, Page 174) Why the iron cans are electroplated with tin ? CL provides CBSE Science prep material for class 8 students. In what proportion the two products from electrolysis of water are obtained ? But when salt is dissolved in pure water, it conducts electricity. Take 250 ml. Question 5. Answer: Question 12. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. Water is dissociated into its constituent gases, i.e., hydrogen and oxygen. [NCERT] Answer: Distilled water does not have any salts dissolved in it, but rain water may have some impurities in it. Question 3. The possible reasons for this are : Question 4.

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