Electrical conductivity

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Intros
Lessons
  1. Conducting electricity
  2. What is electrical conductivity?
  3. Factors affecting electrical conductivity.
  4. Why are solvents important in conducting electricity?
  5. How to tell if something conducts electricity.
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Examples
Lessons
  1. Recall the factors that affect electrical conductivity.
    A student sets up a circuit containing a large lightbulb, using electrodes placed in a solution of different compounds dissolved in water. The solutions are measured to be all be the same concentration. The circuit was switched on and the state of the lightbulb was recorded.
    1. Some results shows the lightbulb not glowing at all. What does this tell us about the solution?
    2. In one solution, the bulb glowed weakly. The student then decided to increase the concentration tenfold by adding ten times more solute (the solution is still unsaturated). Describe and explain what happened to the lightbulb after doing this.
    3. In one experiment, the student did not use a solution, but instead crystals of an ionic compound. The lightbulb did not glow at all. Using standard laboratory equipment, suggest two things that the student could do to make the light bulb glow.
  2. Recall the types of chemical substances that can conduct electricity.
    Read the list of chemical substances below and highlight the substances that would conduct electricity, and in what situation(s).
    i) CH4
    ii) NaCl
    iii) Mg
    iv) CO2
    v) H2O
    vi) CH3COOH