Question

storyline 1 exam
66 of 73
a student is conducting an experiment on an unknown white substance. the substance is a white crystal and does not melt when placed over a heat source for an extended period of time.
which properties should the white substance have to indicate that it is an ionic compound? select all that apply.
it should be conductive as a solution.
as a solid, it should be able to dissolve in water.
as a solid, the ions should move when voltage is applied.
it should have a low melting point.

Explanation:

• Ionic compounds dissociate into ions in solution, which can conduct electricity. So, being conductive as a solution is a property of ionic compounds.
• Many ionic compounds are soluble in water. When they dissolve, they form a solution with mobile ions.
• In solid ionic compounds, ions are held in fixed positions by strong ionic bonds. So, ions do not move when voltage is applied in the solid state.
• Ionic compounds have high melting points due to the strong electrostatic forces (ionic bonds) between ions.

Answer:

It should be conductive as a solution.
As a solid, it should be able to dissolve in water.