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Year 11 - Science

Electrolysis: aqueous solutions practical

Electrolysis

Unit Summary

This unit focuses on electrolysis, electrode reactions, and predicting products, including competing reactions in solutions. It explains metal extraction through electrolysis and writing ionic equations. It also covers tests for gases like oxygen, hydrogen, carbon dioxide, and chlorine.

Lesson Summary

You will learn to investigate what happens when aqueous solutions are electrolysed with inert electrodes.

Key Notes

  • Electrolysis involves the decomposition / break-down of a substance by passing an electric current.
  • Two types of positive ions are in competition at the negative electrode
  • Two types of negative ions are in competition at the positive electrode
  • There are rules for which substances are discharged at the anode and cathode
  • The gases produced during electrolysis can be collected and tested

Vocabulary To Learn

  • aqueous solution: formed when a substance is dissolved in water
  • electrolyte: a liquid or aqueous salt solution that contains freely moving ions
  • electrolysed: when a substance has been broken down by electrolysis

Common Mistakes To Avoid

  • confusing the electrodes, electrical cables or carbon electrodes having a break in them

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Electrolysis involves the decomposition / break-down of a substance by passing an electric current. Two types of positive ions are in competition at the negative electrode.

2. Define this scientific word and use it in context. 'aqueous solution'

formed when a substance is dissolved in water. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: confusing the electrodes, electrical cables or carbon electrodes having a break in them. Correction: Use the PANIC acronym; positive anode negative is cathode. Check all components of the electric circuit.

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