Practice Quiz

Praxis II General Science

Category - Physics

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Which of the following is true about substances that conduct electricity well?
  1. There is more space between their molecules.
  2. They possess many positive ions.
  3. They are heavier than substances that do not conduct electricity well.
  4. They have many free electrons.
  5. None of the above.
Explanation
Answer: D - Free electrons or negative ions are what give substances good conductivity. Electricity is essentially the transfer of electrons. Thus, substances that have more free electrons in their valence shells will be able to conduct electricity better.
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