Because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
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An Aqueous solution is used to reference any solution where water acts as the solvent. A lot of substances can dissolve in water including acids and bases and when they do this they become aqueous solutions.
Aqueous solutions are denoted by the symbol (aq) in solutions as shown in this reaction below where Sodium Chloride is dissolved in water;
NaCl(s) → Na+(aq) + Cl-(aq)
Aqueous solutions are capable of conducting electricity if electrolytes are the ones dissolved in the water.
There are however some substances that cannot form aqueous solutions because they cannot dissolve well in water for example, organic substances like oils.
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Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
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