Which of the following best explains why some solutions are better conductors of electricity than others?

• A. They contain a higher concentration of ions that can move freely.
• B. They are made from nonpolar solvents that enhance ion movement.
• C. They contain molecules that do not dissociate in water.
• D. They have a lower temperature, which increases conductivity.

Answer: (A)

Verified step by step guidance

1. Understand that electrical conductivity in solutions depends primarily on the presence of charged particles, called ions, which can move freely and carry electric current.
2. Recognize that solutions with a higher concentration of ions will conduct electricity better because more charged particles are available to transport charge through the solution.
3. Note that nonpolar solvents generally do not dissolve ionic compounds well, so they do not enhance ion movement; polar solvents like water are better at dissociating ionic compounds into ions.
4. Understand that molecules that do not dissociate in water do not produce ions, so they contribute little to electrical conductivity.
5. Remember that increasing temperature usually increases conductivity because ions move faster, so a lower temperature would not increase conductivity.