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C3 Electrolysis

Edexcel C3 Electrolysis

QuestionAnswer
A gas which forms at cathode Hydrogen
Which ions are attracted to the cathode Metals ions (or cations)
The positive electrode Anode
Which ions are attracted to the anode Non-metals ions (or anions)
The negative electrode Cathode
How the metal ions become atoms at the cathode Gain electrons
A positively charged ion Cation
How the non-metal ions become atoms at the cathode Lose electrons
A negatively charged particle Anion
What state compounds must be in order to separate by electrolysis Molten
What is a charged particle Ion
What is oxidation? Loss of electrons
What is reduction? Gain of electrons
Describe how to make the ions in an ionic compounds mobile Melt the compound or Dissolve it in water
The charge formed on metals ions Positive
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
The charge normally formed on non-metal ions Negative
A possible reaction at a cathode? Mg+2 + 2e-  Mg Yes, at the cathode, metal ions gain electrons, metal ions are reduced
Is this an oxidation or a reduction? 2Cl-  Cl2+2e- Oxidation, because electrons are lost
Is this an oxidation or a reduction? Mg+2 + 2e-  Mg Reduction, because electrons are gained
What will be collected at the anode during the electrolysis of molten copper chloride (inert electrodes)? Chlorine
What will be collected at the anode during the electrolysis of copper chloride solution (inert electrodes)? Chlorine
What will be collected at the cathode during the electrolysis of molten copper chloride (inert electrodes)? Copper
What will be collected at the cathode during the electrolysis of copper chloride solution (inert electrodes)? Hydrogen
What will be collected at the anode during the electrolysis of copper sulfate solution (inert electrodes)? Oxygen
What will be collected at the cathode during the electrolysis of copper sulfate solution (inert electrodes)? Copper
What will be collected at the anode during the electrolysis of sodium sulfate solution (inert electrodes)? Oxygen
What will be collected at the cathode during the electrolysis of sodium sulfate solution (inert electrodes)? Hydrogen
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?]
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?]
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?]
Why does an ionic compound only conduct electricity when molten? ions are free to move
What are the electrodes made of in the purification of copper? Copper metal
What are the ions in molten Copper Chloride? Copper ions and Chloride ions
What are the ions in Copper Chloride solutions? Copper ions, Hydrogen ions, Hydroxide ions and Chloride ions
Created by: UrsulineChem
 

 



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