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| A substance that conains ions. When in solution or melted the ions become free to move and the substance is chemically changed when we pass an electric current through it. |
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| The breaking down or changing o an electrolyte by passing an electric current through it. |
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| An electric condunctor used to connect an electrolyte to an electric circuit. |
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| The ions attached to the anode. They have the opposite charge to the electrode therefore so they are negative ions. |
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| The ions that are attached to the cathode.They have the opposite charge to the electrode therefore so they are positive ions. |
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| The ions that are attached to the cathode.They have the opposite charge to the electrode therefore so they are positive ions. |
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1. Adding oxygen
2. Removing hydrogen
3. Removing electrons |
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1. Removing oxygen
2. Adding hydrogen
3. Adding electrons |
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| When oxidation and reduction happen at the same time |
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| Give a test for oxidizing agents (when they oxidize) |
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Definition
Add potassium manganete (VII) and the solution goes from purple to colourless.
Or add potassium dichromate which turns from orange to green. |
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| Give a test for reducing agents (when they reduce) |
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| Add potassium iodide which turns brown. |
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| What happens ate the anode? |
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| What happens at the cathode |
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| Write the equations for the reaction that takes place at each electrode when NaCl(aq) is electrolized. |
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Definition
Na+1 Cl-1 H+1 OH-1
At the anode: 2Cl-1 + 2e-
At the cathode: 2H+1 + 2e- = H2 |
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| Write the equations for the reaction that takes place at each electrode when NaCl(l) is electrolized. |
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Definition
At the cathode: Na+1 + e- = Na
At the anode: 2Cl- = Cl2 + 2e- |
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| What is the ore from which we get aluminium.. |
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| Why is cryolite put in an electrolytic cell? |
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Definition
| To lower the boiling point. |
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