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[GET] Electrolysis Exam Questions And Answers
Posted on 8-May-2021
How is the passage of electricity through an electrolyte different from the passage of electricity through copper wire? State three applications of electrolysis. Give reasons why a solution of AgNO3 is a good electrolyte but it is not used in...
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[FREE] Electrolysis Exam Questions And Answers | latest!
Posted on 23-May-2021
What particles are present in pure Lead bromide? Why is the electrolytic cell made of silica? Summarise the electrode reactions. Complete the following paragraph by inserting one of the following words in each blank space: [heated, lead,ions,...
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Electrolysis Quiz
Posted on 14-Mar-2021
Complete the electrolytic reaction of the above electrolysis. Electroplating with silver: a. Name the electrode formed by the article to be plated. What ions must be present in the electrolyte? Name the electrolyte used. What should be the nature of the anode? Electroplating with Nickel: b. Complete the electrolytic reactions of the above electrolysis. Choose words from the following list, write appropriate words to fill the blank spaces. The diagram represents the arrangement for the electro refining of copper. Electrolysis is used the purification of metals. Name the following with reference to the electrorefinfing of copper. Anode used b. Cathode used c. Electrolyte used d. The product formed at anode. The product formed at cathode. Explain why i The concentration of the aqueous copper sulphate, does not change during the electro refining process. Complete the table given below for the electrolytic reaction.
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C1,2,3 AQA Test Revision
Posted on 22-Apr-2021
Give reasons for the following: a. Metals above Zn in the activity series of metals are extracted from their ores by electrolysis. Extraction of sodium is carried out by electrolysis of NaCl in molten or fused state only. Complete the following table which refers to two practical applications of electrolysis: Choose from the following list the one which contains: a. Why is the electrolysis of acidulated water considered as an example of catalysis? Prolonged electrolysis of CuSO4 solution between platinum electrodes, results in the formation of hydrogen gas at the cathode and oxygen gas at the anode. When a zinc rod is placed in a solution of silver nitrate, a white ppt is formed while no ppt is formed when a silver rod is dipped in a solution of Zinc nitrate. Why is copper sulphate solution not kept in iron vessels?
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Electrolysis (Powerpoint, Summary Sheet, Exam Question And MS)
Posted on 15-Mar-2021
A solution of cane sugar does not conduct electricity but a solution of NaCl is a good conductor. Give reason. In the electrolysis of acidified water dilute sulphuric acid is preferred to dilute nitric acid for acidification. Match the substance from the following list with appropriate description given below: a. AgCl c. HCl d. CuSO4 e. Graphite A pink metal which is deposited at the cathode during the electrolysis of the solutions of this salt. Why is carbon tetrachloride, which is a liquid, a non electrolyte?
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Chemistry Revision
Posted on 26-Mar-2021
What is observed when copper sulphate solution is electrolysed using a platinum anode? Identify the following reactions as either oxidation or reduction: a. A solution of silver nitrate is a good electrolyte but it is not used for electroplating an article with silver. Electrons are getting added to element Y. Which electrode will Y migrate to during electrolysis?
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Secondary Science 4 All
Posted on 3-Mar-2021
Write two applications of electrolysis in which the anode diminishes in mass. What kind of particles will be found in a liquid which is a non electrolyte? Name the liquid which is a non electrolyte. Name a solid which undergoes electrolysis when molten. Classify the following substances under strong electrolytes, weak electrolytes and non electrolytes: acetic acid, NH4Cl, dil. What is an electrolyte? Long answer Questions 1. During electrolysis of CuSO4 solution using platinum as cathode and carbon as anode: a. What do you observe at the cathode and at the anode?
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4.3 Electrolysis
Posted on 8-May-2021
What change is noticed in the electrolyte? Write the reactions at the cathode and at the anode. Differentiate between the electrical conductivity of CuSO4 solution and Cu metal. Why is the electrolysis of acidulated water considered as an example of electrolysis. Ramu wants to electroplate his key chain with nickel to prevent rusting. For this electroplating, a.
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Electrolysis - AQA Test Questions - AQA
Posted on 16-Apr-2021
The Statue of Liberty metals in contact The Statue of Liberty is a 46 m high statue of a woman holding aloft a flaming torch. It stands on a small island near the entrance to New York harbour. Liberty was a gift from France to commemorate the France-US alliance during the American war of independence. It was built in France and transported in pieces to New York where it was assembled and mounted on a large pedestal. It was finally completed in The statue was made with an internal steel support structure skeleton with a copper 'skin' that took on the characteristic bluish-green colour of air-oxidised copper — a mixture that includes copper hydroxide and carbonate called a patina.
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Electrolysis Multiple Choice Questions Answers - Set 10
Posted on 5-Apr-2021
The patina is not only attractive in appearance but also it protects the underlying copper from further corrosion because it forms an impervious layer. The people who made the statue knew about corrosion of metals in contact and tried to avoid this corrosion problem by using strips of asbestos coated with shellac to insulate the steel supporting bars from the copper skin. However over time about years , particularly with movement of the copper skin relative to the steel supports due to copper's greater thermal expansion than steel , this insulation was worn away and severe corrosion set in.
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Chemistry MCQs For Class 12 With Answers Chapter 3 Electrochemistry
Posted on 23-Mar-2021
The steel supports rusted with the supporting tips of many of them breaking off so that the copper skin was able to flap about in the wind and tear and become damaged. Finally in the statue underwent a major restoration. The rusted steel bars were replaced with stainless steel ones to resist corrosion and as added protection teflon sleeves were used to insulate the copper skin from the stainless steel supports. These sleeves also allowed the copper skin to move more easily with expansion.
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JAMB Physics Past Questions And Answers (Free PDF Download) For 2021
Posted on 20-Mar-2021
Apart from repairing some minor damage, the copper skin with its lovely patina was preserved. Today a greater threat to the statue is acid rain. Acid sulfate soils and acid mine drainage On page it is explained how certain bacteria can reduce sulfate to sulfide and so bring about corrosion of iron at ocean depths too great for there to be sufficient dissolved oxygen to corrode the iron. This may bring to mind an environmental problem that often occurs in Australia, namely acid sulfate soils which is not a very informative name! Some soils when they are disturbed — dug up for farming or excavated for sub-divisions and buildings — produce acid which drains into waterways and so has a detrimental effect upon aquatic life.
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VCE Chemistry
Posted on 19-Apr-2021
The problem here is oxidation of sulfide to sulfate — in some ways the opposite to the bacterial oxidation of shipwrecks. The soils that produce acidic run-offs are ones that contain iron pyrites, FeS2. This unexpected formula arises because the two S atoms are covalently bonded together to form the S22— ion: —S—S—. The cause is this same series of reactions: mining exposes iron pyrites to air and so oxidation occurs. This is called acid mine drainage and is a serious problem for most coal mines. Anodisation of aluminium On page it was stated that aluminium was a passivating metal, meaning that it readily forms a protective oxide layer that prevents further oxidation corrosion.
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GCSE Chemistry Questions
Posted on 28-Apr-2021
This protective oxide layer can be made thicker and hence more effective in protecting the underlying metal by a process called anodising. The aluminium object to be protected is made the anode in an electrolysis cell: the electrolyte is a solution of sulfuric acid and the cathode a piece of unreactive metal for example, stainless steel or platinum.
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WAEC Chemistry Questions And Answers For 2021/2021 (Theory And Objectives)
Posted on 21-Apr-2021
Explain what corrosion is. However the main factor affecting the choice of metal has been cost. Generally it has been more cost-effective to protect steel against corrosion than to use a corrosion-resistant metal. You should mention that the corrosive nature of aquatic environments did lead to the use of aluminium in some vessels and that the development of stainless steels has resulted in their use in parts of big ships. You could include two, three or all four of the following equations if you can recall them quickly. These lead to corrosion of many metals and alloys. Steel was the first metal alloy used for making vessels ships , because it was readily available at a reasonable price. Unfortunately iron steel rusts corrodes. For rusting to occur there needs to be oxygen and water present. Rusting is speeded up if there is salt sodium chloride, NaCl dissolved in the water.
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ICSE CHEMISTRY ELECTROLYSIS QUESTION BANK
Posted on 9-May-2021
Rust is hydrated iron III oxide. Since vessels operate in the surface layers of the water body they are in, there are always water and dissolved oxygen present, so steel needs to be protected either by paint or by using sacrificial electrodes. It would be better to use some metal or alloy other than iron that did not corrode but until recently none was available at a competitive price, even after taking corrosion protection into account. The main factor in the choice of metal for making ships has been cost. In recent decades aluminium and various alloys of it have become more readily available and have been used for making smaller vessels such as pleasure craft and catamarans and for various fittings and superstructures on large ships though not for hulls, mainly because they lack the required structural strength.
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15 Electrolysis Quizzes Online, Trivia, Questions & Answers - ProProfs Quizzes
Posted on 23-May-2021
In the century after steel-hulled ships were first built there were steady improvements in the composition of steels used less carbon, near zero sulfur and phosphorus that increased their rust resistance. Changes from riveting to welding for joining sheets of steel also improved rust resistance by avoiding crevice corrosion. Development of stainless steels that do not rust led to their use in many fittings in ships though stainless steel is still too expensive for hulls. Compare the conservation and restoration techniques used in TWO of these projects with reference to the chemistry applied.
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Electrolysis | AQA GCSE Chemistry | Questions & Answers
Posted on 3-Mar-2021
There is an implication in this question that the answer should refer to current projects which is not a restriction incorporated in the syllabus. The difficulty this presents is that some of the best projects for answering this question — the restoration of Cook's cannon and the restoration of Batavia or silver coins from Western Australia are not current. The best approach here would be to ignore the implication of current since it is not in the syllabus and talk about any Australian projects. Restoration of an iron cannon either from Cook's Endeavour or the Pandora is an obvious choice. The second choice could be restoration of silver coins from Dutch wrecks off Western Australia or restoration of wood such as from the Batavia.
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National 5 Unit 3 Metals Past Paper Questions And Answers
Posted on 14-Mar-2021
Note that the question is compare and also note the with reference to the chemistry applied part. State the two projects you are going to consider at the start of your answer. Before you can compare the techniques you need to describe what they are. A reasonable assumption for this question is that there will be two marks for describing the techniques in each project and three marks for comparing them. Hence you need to keep the descriptions brief — just enough to be the basis for the comparison, and make the comparison as thorough as you can. Three comparisons would seem desirable: the method of conservation coating with wax , the method of chloride removal electrolysis versus simple leaching and the method of restoring lost or corroded material electrolysis for iron, wax for cellulose.
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Chemical Reaction Interview Questions & Answers
Posted on 11-Apr-2021
There is not too much chemistry in the restoration of wood so you have to make the most of what there is. Therefore give the structure of polyethylene glycol and mention how viscosity changes with chain length. Instead of these projects you could have used restoration of silver coins or of a copper or brass artefact, or perhaps of a lead one.
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Faraday's Laws Of Electrolysis Tutorial
Posted on 13-Mar-2021
CCHSC pages The two chosen projects are the restoration of an iron cannon recovered from the Endeavour off the North Queensland coast and the restoration of part of the wooden hull of the Batavia recovered from off the Western Australian coast. This electrolysis also restored much of the corroded iron back to the metal. For its conservation, after careful washing and thorough drying the cannon was coated with a protective wax. For the Batavia's hull the very fragile pieces of salvaged timber were gently washed with water to remove sand and silt. Salvaged wood is very fragile because much of the cellulose of wood has been eaten away by marine organisms with only the lignin left. What remains is heavily saturated with salt. This salt is removed by placing the wood in a solution of polyethylene glycol in water.
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Electrolysis & Simple Cell TYS Questions - O Level Chemistry
Posted on 12-Apr-2021
The polyethylene glycol gradually displaces the salt solution. Polyethylene glycol polymers vary from watery liquids to viscous liquids to waxes as the chain length increases that is as n increases. As the salt is leached out, the polymer used is changed to a more and more viscous one until finally a waxy one is used. This fills up all the spaces in the wood and restores strength to the wood. The wood is then carefully dried and coated with a wax to conserve it. The conservation method is the same for both artefacts — coating it with a film of a non-reactive wax. The method of removing chloride is different in the two cases. In the cannon because much of the chloride is present as an insoluble Fe OH Cl which cannot be leached out, electrolysis is needed to convert the insoluble compound to soluble chloride which can be removed. In the wood the chloride is present in soluble form and so can be leached out over time.
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AQA GCSE Chemistry
Posted on 15-May-2021
It was on the basis of these ideas of connecting chemical structure and reactivity to charged particles that Arrhenius was able to propose his theory of ionic solutions — that they consisted of positive and negative species he called ions. Later scientists saw the connection between oxidation and reduction, which had been defined in terms of gain or loss of oxygen or hydrogen or change in valence, to electron transfer — that oxidation corresponded to loss of electrons while reduction corresponded to gain of electrons.
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Electrolysis Quiz - ProProfs Quiz
Posted on 2-Apr-2021
Why caesium and gallium melt in our palm? Why magnesium ribbon starts floating in hot water? What are ionic compounds? To obtain metal from their metal oxide, which chemical process is used? Give the chemical equation as well. What is the difference between a mineral and an ore? Differentiate between roasting and calcinations process in metallurgy. What is an alloy? Name the alloy which has iron, nickel and chromium as its constituent. What is the chief use of this alloy? Explain any two ways to prevent rusting of iron. Explain briefly electrolytic refining method. How does carbon attain noble gas configuration? Draw electron dot structure of water molecule. Write the name and formula of 2nd member of homologous series having general formula CnH2n. Name the first member of ketones. What is glacial acetic acid? Why carbon is tetravalent?
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Chemistry MCQs For Class 12 With Answers Chapter 3 Electrochemistry - NCERT Books
Posted on 13-Apr-2021
An organic compound burns with blue clear flame. Is it saturated or unsaturated compound? Write the molecular formula of ethanol. Name the gas evolved when ethanoic acid is added to sodium carbonate? Write balanced chemical equation of dehydration of ethanol by hot conc. Name organic acid present in vinegar. What is catenation? Why soap is not suitable for washing cloth when water is hard? How many covalent bonds are present in pentane C5H12? What are hydrocarbons? Give examples. Why does carbon atom forms a large number of compounds? Write down two characteristics of the compounds of an homologous series.
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Chemistry Important Questions 2021
Posted on 22-Mar-2021
Write down structural formula of : a Propanone b Hexanal 6. Why carbon is unique in nature? Which is better for health butter or vegetable oil? H2SO4 in making ethane from ethanol? Differentiate between soap and detergents. What is oxidizing agent? Give two examples. What is hydrogenation? Write its industrial application. What is homologous series? Explain with the help of example. What is structural isomerism? Draw isomers of pentane C5H A boy sharpens a pencil at both the ends and connects them to the poles of the battery. Will the current flow through the circuit? Give reason. A neutral organic compound is warmed with some ethanoic acid and a little of conc.
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Common IGCSE Chemistry Exam Questions With Answers
Posted on 11-Mar-2021
H2SO4 to form ester, vapours having sweet smell are evolved. Write the chemical equation and what type of functional group is present in this organic compound? Explain the cleansing action of soap with the help of diagram. Periodic Classification of Elements.
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Electrolysis Test Questions - Other
Posted on 18-Apr-2021
Past Papers Welcome Welcome to the largest database of past papers for ocr past papers, edexcel and aqa past papers for gcse and A levels. Past Papers Archive : igcse chemistry electrolysis questions In our archive section you can find links to various websites that have old past papers in the pdf format. Enter the search term in the box below and click the 'search archive' button. Here are 10 results for igcse chemistry electrolysis questions: 1. Labels: edexcel igcse chemistry past question paper, igcse chemistry past question of 6. PDF filestore. Contents: 1. The particulate nature of matter. Experimental techniques 2. Chemistry Revision Notes Kinetic theory states that
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AQA GCSE Chemistry Topic 4: Chemical Changes Revision - PMT
Posted on 3-Mar-2021
QUESTION where must an object be placed in front of the concave mirror so that the image will be formed between the center of curvature and the focus. Which of them will have a faster rate of diffusion? What would be the length when the applied force is increased by 8N? Memorize your formula: Memorizing useful and basic formula in any calculative subject will go a long way in helping you get the answers to most questions involving calculation easily. Definition of all Laws and Theories: This is important. Understanding these laws, theories and its application is important, because JAMB may decide to bring a question from any law.
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Test: Electrolysis & Faraday's Laws | 32 Questions MCQ Test
Posted on 1-Apr-2021
Important Dates: As you are already aware, Physics is a science subject, and science subjects always have notable people who discover or invent something notable. Just so you know, JAMB sometimes picks questions around dates. The answer is no. To ensure this becomes a reality, every CBT center in Nigeria has more than four 4 security cameras connected to Abuja.
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