Edexcel C3 Electrolysis
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| A gas which forms at cathode | Hydrogen
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| Which ions are attracted to the cathode | Metals ions (or cations)
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| The positive electrode | Anode
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| Which ions are attracted to the anode | Non-metals ions (or anions)
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| The negative electrode | Cathode
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| How the metal ions become atoms at the cathode | Gain electrons
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| A positively charged ion | Cation
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| How the non-metal ions become atoms at the cathode | Lose electrons
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| A negatively charged particle | Anion
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| What state compounds must be in order to separate by electrolysis | Molten
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| What is a charged particle | Ion
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| What is oxidation? | Loss of electrons
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| What is reduction? | Gain of electrons
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| Describe how to make the ions in an ionic compounds mobile | Melt the compound or Dissolve it in water
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| The charge formed on metals ions | Positive
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| Is this a possible reaction at an anode? Mg+2 + 2e- Mg | No, at the anode non-metals ions are losing electrons, non-metal ions are oxidised
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| The charge normally formed on non-metal ions | Negative
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| A possible reaction at a cathode? Mg+2 + 2e- Mg | Yes, at the cathode, metal ions gain electrons, metal ions are reduced
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| Is this an oxidation or a reduction? 2Cl- Cl2+2e- | Oxidation, because electrons are lost
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| Is this an oxidation or a reduction? Mg+2 + 2e- Mg | Reduction, because electrons are gained
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| What will be collected at the anode during the electrolysis of molten copper chloride (inert electrodes)? | Chlorine
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| What will be collected at the anode during the electrolysis of copper chloride solution (inert electrodes)? | Chlorine
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| What will be collected at the cathode during the electrolysis of molten copper chloride (inert electrodes)? | Copper
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| What will be collected at the cathode during the electrolysis of copper chloride solution (inert electrodes)? | Hydrogen
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| What will be collected at the anode during the electrolysis of copper sulfate solution (inert electrodes)? | Oxygen
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| What will be collected at the cathode during the electrolysis of copper sulfate solution (inert electrodes)? | Copper
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| What will be collected at the anode during the electrolysis of sodium sulfate solution (inert electrodes)? | Oxygen
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| What will be collected at the cathode during the electrolysis of sodium sulfate solution (inert electrodes)? | Hydrogen
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| Describe and Explain the reaction taking place at the cathode during electrolysis, in terms of electron transfer | At the Cathode, the metal ion gains electrons: it is a reduction [Have you used keywords? Have you said HOW MANY electrons?]
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| Describe and Explain the reaction taking place at the anode during electrolysis with INERT electrode, in terms of electron transfer | At the Anode, the non-metal ion lose electrons: it is an oxidation [Have you used keywords? Have you said HOW MANY electrons?]
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| Describe and Explain the reaction taking place at the anode during electrolysis with ACTIVE electrode, in terms of electron transfer | At the Anode, the Copper metal ATOMS lose electrons to form IONS; the copper ion dissolve in solution: it is an oxidation [Have you used keywords? Have you said HOW MANY electrons?]
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| Why does an ionic compound only conduct electricity when molten? | ions are free to move
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| What are the electrodes made of in the purification of copper? | Copper metal
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| What are the ions in molten Copper Chloride? | Copper ions and Chloride ions
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| What are the ions in Copper Chloride solutions? | Copper ions, Hydrogen ions, Hydroxide ions and Chloride ions
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