Do you notice any gas bubbles near the electrodes? Activity 2 (NCERT Textbook, Page 773) (6) Electricity is used to pump underground water from tube wells for irrigation in field. When electric current is passed through copper sulphate solution, the copper sulphate breaks up into copper and sulphate ions. If the ends of the wire of tester are touched for a long time, what will happen ? and ………….. Recall the definition of a chemical change that you learnt in Class VII. Answer: Explain why they do this. Question 10. A metal is released in the electrolysis of a salt. (a) magnetic energy into chemical energy Answer: Answer: Water is a solution of salts and so it is a good conductor of electricity. What is CFL ? Method : Question 2. Answer: The passage of an electric current through a solution causes ……………….. effects. Is it possible that the connections are loose? Activity 4 (NCERT Textbook, Page 175) Open up your curtains and let the sun shine in! Insulators : distilled water, milk. Terms in this set (11) Electricity. 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. of distilled water in a clean and dry beaker. Answer: Name three liquids, which when tested in the manner shown in Fig. (iv) conducting properties of liquid cannot be compared in this manner. No, pure water doesn’t conduct electricity. A household uses the following electric appliances: (i) Refrigerator of rating 400 W for ten hours each day. Answer: Question 1. Answer: Fill in the blanks. Question 15. Why ? Name one non-metal which a good conductor of electricity. Solution: Calculate the electricity bill of the household for the month of June if the cost per unit of electric energy is Rs. (Instead of carbon rods, you may take two iron nails about 6 cm long.) Answer: Wait for 3-4 minutes. Question 5. Question 9. In case of a fire, before the firemen uses the water hoses, they shut off the main electrical supply for the area. Can you ex¬plain the reason? Question 8. Clean copper plates with sand paper. Question 2. What do you conclude this time? Question 1. (c) electrolysis Other uses include paint sprayers, air filters and dust removal. (ii) liquid B is a better conductor than liquid A. Answer: (b), Question 6. Question 2. Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to deflect. Why we cannot make the whole article with chromium ? Answer: It is concluded that when electric current is passed through the copper sulphate solution, copper sulphate dissociates into copper and sulphate. Liquid B is a better conductor than liquid A. But the bulb does not glow. Answer: We will need copper sulphate and two copper plates of size around 10 cm x 4 cm. Answer: As water is a good conductor of electricity so it can cause electrocution. Make sure that the metal caps of the carbon rods are outside the water. Can we do electroplating on it to protect is from corrosion ? Or, the bulb is fused? Question 5. LED is a device in which the two terminals inside the glass bulb are connected together with a metallic point of Galluim Arsenide. Question 14. Join the free ends of the tester together fora moment. No, it is highly dangerous to carry out the electrical repairs outdoors during the heavy downpour. They can produce a shock of around 500 volts. Question 12. However, if the bulb does not glow, it means that the tester is not working. Why ? [NCERT] Powdered coal is burnt at high temperature which further turns water into steam. In what proportion the two products from electrolysis of water are obtained ? In each case observe whether the magnetic needle shows deflection or not. How should LED be connected ? Chromium has a good shine, it resists scratches and is corrosion resistant. Artificial jewellery is plated with silver or gold. (a) anode (d) chemical energy into magnetic energy The possible reasons for this are : Question 4. Now rinse them with water and dry them. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. Answer: Hence, water is avoided in extinguishing electric fires. Dinesh is wants to study the chemical effect of current at home. Created by. 14.6. If the current in the circuit is small, how can we test its presence ? We call these two rods electrodes. (c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ________ terminal of the battery. Two famous scientists, Thomas Edison and Nikola Tesla, once had an argument over what kind of electricity we should use in our homes, AC or DC. Give three applications of chemical effect of current. Place a small compass needle inside it. List the possible reasons. Does the bulb of the tester glow? 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. An electric eel is a fish that makes its own electricity ,Lightning is spark of electricity in the air and bulb uses electricity to glow. [NCERT] Answer: Question 11. Refining of metal are for obtaining pure metal. However, if the bulb does not glow, it means that the tester is not working. Question 8. (c), Question 7. Pour about two teaspoonfuls of distilled water in each of them. Answer: Does pure water conduct electricity? This happens because the when current is passed, the K+ ions are attracted to the metal sheet. resistance 240 = 240 V R= 8 Current (I) = 30 =8A V R= I 39. Again test. Instead the iron can be galvanised or painted. [NCERT] Solution: So she collected some rainwater in a clean glass tumbler aifd tested it using a tester. Question 16. Record your observations in Table 14.1. Zinc coatings prevent the corrosion of steel articles. Question 4. You would conclude that. Thus water which is free of salts are poor conductors while water with salts is a good conductor of electricity. Chromium is used for electroplating because it has a shiny appearance, does not corrode and is scratch resistant. Prepare a list of objects around you that are electroplated. Copper from impure rod is sought to be transferred to the thin copper plate. Take out carbon rods carefully from two discarded cells. Take two pieces of copper wire and iron wire. Electrical charge. Question 3. (b), Question 8. Answer: Answer: Use the tester to test whether distilled water conducts electricity or not. Explain why they do this. The free copper gets deposited on the plate acting as cathode. PLAY. You may also get distilled water from a medical store or a doctor or a nurse). Wrap an electric wire a few times around the tray. Tin is less reactive than iron. Take another piece of wire and connect it to the other terminal of the battery (Fig. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. Now remove the electrodes from the solution and look at them carefully. Solution: 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. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. Spell. Question 1. Do you find a coating over it? If the electric potential is negative in the direction of electric current and the How can the magnetic effect be used as a tester ? Vinegar, lemon juice and tap water. Learn. You would conclude that [NCERT] Which properties of chromium make it useful for electroplating on iron ? Solving the Chemical Effects of Electric Current Multiple Choice Questions of Class 8 Science Chapter 14 MCQ can be of extreme help as you will be aware of all the concepts. Write on the paper with the end of the wire connected to the positive terminal. (iv) The liquid may be an insulator, i.e., a poor conductor of electricity. Question 20. Or, your cells are used up? (You may obtain distilled water from your school science lab. Why? What could be the reasons ? This is the Volvo VRN Electric, the company's first electric class-8 truck. Compact Fluorescent Lamps. (c) Sodium chloride LEDs emitting white light can be used instead of bulbs. (a) acids, bases, salts (d) Vinegar Answer: Electricity Uses. Question 6. This process is known as chemical effects of current. LED is Light Emitting Diode. Solved Examples for You. If the ends of the wire of tester are touched for a long time, the cells will be finished very soon. Explain. Answer: may be the current is so weak that it does not heat the filament of the bulb allowing it to glow. Electricity is a part of our daily life. Does lemon juice or vinegar conduct electricity? Question 4. Explain your answer. Connect the copper plates to the terminals of a battery and immerse them in copper sulphate solution (Fig. Answer: Lighting 1 Embrace natural light. (7) Electric iron, mixer and grinder, microwave oven, electric geyser, electric kettle, washing machine, radio set, television set, stereo system computer all work because there is electricity. Many powerplants around the globe produce this resource for the massive consumption now experienced but often at great cost to the environment. This shows that distilled water does not conduct electricity. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Solution: Paheli had heard that rainwater is as good as distilled water. 14.5. may cause the magnetic needle to deflect. Activity 3 (NCERT Textbook, Page 174) Add a few drops of lemon juice or dilute hydrochloric acid to distilled water in one cap. Answer: Why the iron cans are electroplated with tin ? But when salt is dissolved in pure water, it conducts electricity. (d) Potassium Humans cannot survive without it. Question 18. (d) Nitric acid View and Download PowerPoint Presentations on Electricity And Magnetism Class 8 PPT. Answer: Explain your answer. Compass needle shows deflection due to magnetic effect of electric current. Answer: Attach the free ends of the wires to a LED. Answer: Question 10. Pour one teaspoon of lemon juice or vinegar in one cap. Domestic Use; Generating Electricity. Answer: Chemical Effects of Electric Current - Class 8 : Notes. (a) Sea water [NCERT]. Why should you not do the experiments on electricity by using electric supply from mains ? This document is highly rated by Class 8 students and has been viewed 50236 times. What is the Voltage (V) of the rice cooker? the movement of electrons. Electric Current: The flow of electrons in any material is termed as an electric current. [NCT 2011] The major uses of electricity and their shares of total electricity use by the commercial sector in 2014 were 2. machine drives (motors)48.2% 3. process heating and boiler use14.4% 4. facility heating, ventilation, air conditioning, and cooling9.5% 5. electrochemical processes6.8% 6. process cooling and refrigeration7.3% 7. lighting6.5% 8. other miscellaneous processes and facility uses7.3% Example 1• An electric rice cooker operates at 240 V and uses a current of 8 A. Answer: How are bridges and automobiles prevented from rusting ? Answer: What is LED? We cannot make the whole article from it because it is a very costly metal. If they are, then replace the bulb with another bulb. Which of these materials can … But when salt is dissolved in distilled water and again tested, the bulb glows which shows that water containing salts conduct electricity. It can cause electrocution, as water is a good conductor of electricity. Answer: It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. Question 1. Decoration of articles by giving them a layer for e.g., silver plating on cutlery. Answer: Kirchhoff’s Second Law is a consequence of the conservation of energy. What can be the possible reasons for this ? (b) Oxalic acid Find PowerPoint Presentations and Slides using the power of XPowerPoint.com, find free presentations research about Electricity And Magnetism Class 8 PPT (a) Copper In liquids, the movement of charged particles (ions) carry current from anode to cathode terminals. Gravity. What is electrolysis ? (a), Question 4. Question 14. In this page, we are providing Electricity Class 10 Extra Questions and Answers Science Chapter 12 pdf download. (d) photodiode The process of depositing a layer of any desired metal on another material by means of electricity is called …………. 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. Jaya sets up a circuit as given below. Question 11. Question 1. Can we call the change taking place in the solution a chemical change? The filament of the bulb is heated due to current and then it glows. (c) Dilute sulphuric acid Question 21. Question 1. Match. Question 7. Flashcards. (d) The process of depositing a layer of any desired metal on another material by means of electricity is called _______ When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Air is an insulator of electricity. Question 3. This completes the circuit of the tester and the bulb should glow. 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. What do you find? Uses of Electroplating. Answer: Question 11. Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. The bulb may not glow because of the following reasons: Question 1. The bulb does not glow even though the circuit is complete because the current is too small. Question 10. After the electroplating of a spoon with silver, it was found that the anode has become thin. Question 9. The bulb in the tester does not glow when current is passed through it. Yes, the solution does conduct electricity. Now in the second cap containing distilled water, add a few drops of a base such as caustic soda or potassium iodide. Liquid A is a better conductor than liquid B. Electrolysis is the breaking up of a compound from its solution on passing electric current through the electrolyte. Why is chromium used for electroplating ? Apart from chemical effect, which other effect electric current produce ? Distilled water does not have any salts dissolved in it, but rain water may have some impurities in it. Connect the negative terminal of battery to the metal sheet. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. The 21 all-electric BYD heavy duty trucks used by Anheuser-Busch in California since 2019 is still the largest Class 8 truck deployment in North America. Electricity is a form of energy produced by charges. Solution: [NCERT] Explain the process of electroplating of copper. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Answer: 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. 25% of the city of San Francisco's energy is generated by wind power. Collect a few small plastic or rubber caps of discarded bottles and clean them. There are specific disposal guidelines for environmental protection. To her surprise, she found that the compass needle showed deflection. Understanding the power of electricity we humans harness is necessary for the wise use and creation of this valuable resource. In this activity the bulb glows which shows that lemon juice and vinegar both conducts electricity, hence they are good conductors of electricity. The electrode, connected to the positive terminal of a battery, is called Grade 8 Science - Electricity. Take 250 ml. Can you think of the possible reasons? He finds that the compass needle deflects more in the case of seawater. If the tester is put in distilled water, the bulb of the tester does not glow. (i) liquid A is a better conductor than liquid B. Place them in fresh lemon fruit. 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. Give the construction of LED. These MCQ Questions on Chemical Effects of Electric Current Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. RVers parked in areas where they do not need air conditioning will use much less electricity than RVers who do need it. Question 7. Activity 7 (NCERT Textbook, Page 177) Answer: Answer: Answer: 14.2). Answer: Chemical Effects of Electric Current Class 8 Science NCERT Intext Activities Solved. A change in the electric potential change equals the change in electric potential energy per unit charge. Test. Answer: Our bodies use electricity to communicate including telling our heart to keep beating. 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. Join the free ends of two wires momentarily. Protection of the surface of bases metals which corrode for e.g., iron is plated with chromium. Add a teaspoonful of salt or a few drops of lemon juice to water to make it more conducting. Write. 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Which of the following metal is not extracted by electrolysis? (iii) both liquids are equally conducting. What results do you obtain? Materials which do not allow electric current to flow through them are called insulators. The iodide ions (I- ) react with starch to turn blue black. If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the ……….. terminal of the battery. LED glows showing the flow of current. Test which solutions conduct electricity and which do not. Therefore, we can be electrocuted in case we touch appliances with wet hands. Classify the following liquids into conductors and insulators : lemon juice, , distilled water, tap water, milk. [NCERT] If not, what can we do to make it conducting? Answer: Dec 27, 2020 - Important Questions - Chemical Effects of Electric Current, Science, Class 8 | EduRev Notes is made by best teachers of Class 8. A child staying in a coastal region test the drinking water and also the seawater with his tester. 3.00. b) An electric iron of resistance 20Ωtakes a current of … Answer: (Remember to wash and wipe the ends of tester after testing each liquid). The two free ends of wire are connected to the material to be tested. Now dissolve a pinch of common salt in distilled water. 7. Activity 5 (NCERT Textbook, Page 176) The temperature around the electroplating equipment should be optimum. Using natural light … (b) insulator These charges can be at rest or moving .Learn how these moving charges constitute current electricity. (i) The wires in the circuit may be loosely connected. Question 3. The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. Today, the modern sources of entertainment starting from listening music from MP3 players,watching Television, playing movies in DVDs or VCDs or VCRs runs on electricity. The rainwater showed deflection with the tester because it is not as pure as distilled water. How can you make a tester for testing whether a given material is a conductor or an insulator ? This process is known as electroplating. as a point source of light in laser beam torches. Question 13. Explain. What precautions should be observed when doing electroplating ? Answer: If it is still not working then replace the cells with fresh cells. Activity 1 (NCERT Textbook, Page 173) Question 8. Electric eels use electricity to ward off enemies. In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Top (b) coating Answer: The most extensive use of gold plating is on jewellery and watch cases. For example, an RV running off of electric heat will use more electricity than an RV running off of propane. Changes of colour of solutions may occur depending on what solution and electrodes are used. Do you find any difference in any one of them? A tester is used to check the conduction of electricity through two liquids, labelled A and B. (d) electroplating. Answer: This quiz will test your knowledge of the various terms and concepts associated with electricity. Is air an insulator or conductor of electricity ? (i) liquid A is a better conductor than liquid B. What could be the reasons? Heat energy: It is the energy due to the motion of molecule. Question 19. Chemical effects of electric current are used in the working of _____ (a) Electrolytic cells (b) Galvanic cells (c) Electrochemical cells (d) None of these. Answer: The salts separate out and deposit on the sides of the container. Name the gases formed when electric current is passed in water containing a few drops of acid ? Hydrogen and Oxygen. Answer: What colour is the coating? Materials which allow electric current to flow through them are called conductors. (b), Question 5. By volume of hydrogen gas is twice the volume of oxygen gas. (b) electrical energy into chemical energy Most liquids that conduct electricity are solutions of …………, ………. The sea water contains more salts dissolved in it as compared to the tap water. It does not glow even though the circuit of the wire of tester are touched for long! Taking place in the circuit is small, how can you make tester... These moving charges constitute current electricity cause the magnetic needle shows deflection electricity, which when in. In each of them, water is a better conductor than liquid a it is an insulator a staying. Insulators: lemon juice and B calculate the electricity bill of the surface of bases metals which corrode for,... Any one of them below in ohm-meter is about 10 kWh a day another bulb through a,. Difference in any material is termed as an electric current any gas bubbles near electrodes. 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Found that the bulb of the battery with which this electrode is connected to electroplating...