Solid table salt, NaCl

Sugar sports drinks such as Gatorade

Solid calcium carbonate, CaCO3
limestone

Dissolved table salt, Na+ + Cl−

Dissolved oxygen gas, O2

either a conductor or insulator

1 answer

To determine whether the substances you listed are conductors or insulators, we can analyze each one based on its state (solid or dissolved) and its ionic or molecular nature:

  1. Solid table salt (NaCl): Insulator. In solid form, NaCl is a crystalline ionic compound and does not conduct electricity because the ions are fixed in place.

  2. Sugar sports drinks (such as Gatorade): Insulator. Sugar is a molecular compound that does not dissociate into ions when dissolved in water, so it does not conduct electricity.

  3. Solid calcium carbonate (CaCO3, limestone): Insulator. Similar to solid NaCl, solid CaCO3 is an ionic compound but does not conduct electricity in its solid state due to the fixed positions of the ions.

  4. Dissolved table salt (Na⁺ + Cl⁻): Conductor. When NaCl is dissolved in water, it dissociates into free ions (Na⁺ and Cl⁻), which can move freely and carry electric current.

  5. Dissolved oxygen gas (O₂): Insulator. Gaseous oxygen does not dissociate into ions in solution and therefore does not conduct electricity.

Summary:

  • Solid NaCl: Insulator
  • Sugar sports drinks (Gatorade): Insulator
  • Solid CaCO3: Insulator
  • Dissolved NaCl: Conductor
  • Dissolved O₂: Insulator

In conclusion, dissolved NaCl is the only substance in your list that acts as a conductor, while the others are insulators.

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