Electrolysis

phoebe.davies10
Mind Map by phoebe.davies10, updated more than 1 year ago
phoebe.davies10
Created by phoebe.davies10 over 6 years ago
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GCSE Science Mind Map on Electrolysis, created by phoebe.davies10 on 10/21/2014.

Resource summary

Electrolysis
  1. What is Electrolysis?
    1. The decomposition of a compound using electrical energy
      1. The electricity used comes from a d.c source, such as a battery
        1. It requires liquid to conduct the electricity, called the electrolyte
          1. The electricity is applied to the electrolyte by two electrodes
            1. The electrolyte contains the compound, which is broken down into its component parts
              1. The component parts are released as atoms or molecules - often as a gas
              2. Electrolysing Hydrochloric Acid
                1. The electrolyte is a dilute solution of hydrochloric acid
                  1. Applying a d.c current to the electrolyte causes the hydrochloric acid to decompose into two component parts
                    1. Hydrogen
                      1. You can test for this as it makes a "squeaky-pop" with a lighted splint.
                        1. H2 is positive and so it's attracted to the cathode
                        2. Chlorine
                          1. You can test for this as chlorine bleaches damp litmus paper, turning it white. Or red for a moment at first as chlorine is acidic.
                            1. Cl2 is negative and so it's attracted to the anode
                          2. The gases bubble through the solution and can be collected at the electrodes
                            1. Electrodes
                              1. Anode
                                1. has a positive charge
                                  1. attracts anions (negative ions)
                                    1. oxidation - reduction loss
                                    2. Cathode
                                      1. has a negative charge
                                        1. attracts cations (positive ions)
                                          1. reduction - electron gain

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