One way in which chemists try to understand the substances in world around them is
Water is an important solvent.
Solutions in which water is the solvent are referred to as aqueous solutions.
Many solutions that are important to our well-being are aqueous solutions (the sea, the fluids in your body).
Classifications depending on electrical properties
One way in which both substances and solutions can be classified is on the basis of their ability to conduct electricity passed through them.
Electrical conduction is due to movement of charge.
Molecular solids or liquids (such as water) are non-conductors due to the absence of charged particle
Conductivity of aqueous solutions
Substances can be classified as electrolytes or non-electrolytes depending on the conductivity of their aqueous solution.
Substances that give rise to charged particles when they dissolve in water are classed as electrolytes.
Ionic solids are electrolytes because to the extent that they dissolve they dissociate into their ions.
to observe the properties of the substances and
then to classify the substances based on their properties.
then to classify the substances based on their properties.
Water is an important solvent.
Solutions in which water is the solvent are referred to as aqueous solutions.
Many solutions that are important to our well-being are aqueous solutions (the sea, the fluids in your body).
Classifications depending on electrical properties
One way in which both substances and solutions can be classified is on the basis of their ability to conduct electricity passed through them.
Metallic solids are electrical conductors as are molten ionic solids.
Electrical conduction is due to movement of charge.
In metallic solids the particles responsible for conduction are electrons.
In molten ionic solids the particles responsible for conduction are ions.
In molten ionic solids the particles responsible for conduction are ions.
Molecular solids or liquids (such as water) are non-conductors due to the absence of charged particle
Water is a nonconductor.
Water exists as molecules, and these uncharged particles are not attracted to the electrodes.
Water exists as molecules, and these uncharged particles are not attracted to the electrodes.
Conductivity of aqueous solutions
Substances can be classified as electrolytes or non-electrolytes depending on the conductivity of their aqueous solution.
Substances that give rise to charged particles when they dissolve in water are classed as electrolytes.
Ionic solids are electrolytes because to the extent that they dissolve they dissociate into their ions.
NaCl(s) 
Na+(aq) + Cl–(aq)
These ions can move in the solution to complete an electrical circuit.
Na+(aq) + Cl–(aq)These ions can move in the solution to complete an electrical circuit.