CHAPTER 5
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What are the products at the electrodes when dilute sulfuric acid is electrolysed using inert electrodes? | show 🗑
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| Describes the electrolysis of molten potassium bromide? | show 🗑
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| A section of an overhead power cable. Explains why a particular substance is used | show 🗑
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| show | Cathods - Silver
Anode - iodine
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| show | Copper - Cathods
Hydrogen - Cathods
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| show | Making the pan the cathode and the copper the anode
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| An object is electroplated with silver using an aqueous silver salt as the electrolyte. Which set of conditions is used? | show 🗑
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| Which metal could not be used for electroplating by using an aqueous solution? | show 🗑
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| show | Cathode - Hydrogen
Anode - Chlorine
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| show | The object is made the cathode
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| Which substance will not conduct electricity? | show 🗑
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| Which products are formed at the anode and cathode when electricity is passed through molten lead(II) bromide? | show 🗑
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| What will be produced at the anode and at the cathode, if molten potassium chloride is electrolysed? | show 🗑
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| show | Aqueous sodium chloride
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| Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. What would show that the process was exothermic? | show 🗑
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| Name one statement about the electrode products> | show 🗑
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| show | A halogen would be formed at the anode.
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| Describes the colours of the gases at the electrodes? | show 🗑
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| A section of an overhead power cable. Explains why a particular substance is used? | show 🗑
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| Metals could be extracted from their molten chlorides using electrolysis. Which substances are formed at each electrode? | show 🗑
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| Electricity from a power station passes through overhead cables to a substation and then to a school to used electrolyse concentrated hydrochloric acid using inert electrodes. Which substances are used for the overhead cables and the electrodes? | show 🗑
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| Name one statement about the electrolysis of molten lead(II) bromide? | show 🗑
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| What is the test for the gas formed at the positive electrode? | show 🗑
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| show | 1. Molten
2. Cathode
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| The chemical process taking place on the surface of the object is Cu2+(aq) + 2e– Cu(s) Explain whether this process is oxidation or reduction. | show 🗑
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| Give two changes which would be needed in order to coat nickel onto the object | show 🗑
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| Copper, nickel and silver are transition elements. Typical physical properties of transition elements are a high density and a high melting point. Give three different properties of transition metals which are not typical of other metals | show 🗑
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| show | Al 3+ + 3e → Al
formula of Al 3+ ion
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| show | Endothermic
Electrical energy supplied
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| Explain 3 points why the mass of the magnesium electrode decreases and the mass of the copper electrode increases. | show 🗑
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| How could you use this cell to determine which is the more reactive metal, magnesium or manganese? | show 🗑
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| The combustion of propane, C3H8, is exothermic. Give an equation for the complete combustion of propane | show 🗑
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| show | Light from the sun
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| Photosynthesis is an unusual endothermic reaction. Give the word equation for photosynthesis | show 🗑
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| Zinc is an important metal. Its uses include making alloys and the construction of dry cells (batteries). Name an alloy which contains zinc | show 🗑
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| show | Copper
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| show | 2ZnS + 3O2 € 2ZnO + 2SO2
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| show | Manufacture of sulfuric acid
Bleach or making wood pulp or making paperfood or fruit juice or Wine preservative
Fumigant or sterilising
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| Zinc can be obtained from zinc oxide. Aqueous zinc sulfate is made from zinc oxide and the solution is electrolysed with inert electrodes. Name the reagent which will react with zinc oxide to form zinc sulfate. | show 🗑
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| Write the equation for the reaction at the negative electrode | show 🗑
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| Name the product at the positive electrode. | show 🗑
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| The electrolyte changes from zinc sulfate to ...... | show 🗑
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| show | 2H2 + O2 → 2H2O
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| show | Anode
Negative electrode and electrons lost
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| show | H2 → 2H + 2e( ) / H2 – 2e( ) → 2H / H2 + 2OH →
2H2O + 2e( ) / H2 + 2OH – 2e( ) → 2H2O
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| show | lightweight
quieter
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| What is the disadvantage of using a high pressure for the reaction | show 🗑
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| show | Hydrogen and chlorine / H2 and Cl2
Sodium hydroxide / NaOH / Na OH
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| Aluminium is obtained from purified alumina, Al 2O3, by electrolysis. Alumina is obtained from the main ore of aluminium. State the name of this ore. | show 🗑
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| show | Electrolyte aluminum dissolved in molten cryolite
Use cryolite to reduce mp
Electrodes carbon
Aluminum formed at cathode
Oxygen formed at anode
Anode burns
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Created by:
Haridus Academy