What physical properties of a solution differ from those of its solutes and solvent?

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There are three physical properties of a solution that are different from it's solute and solvent:

1. Conductivity
1. Freezing point
1. Boiling point

$\textbf{1. Conductivity}$ is the measure that determines how easily can an electric current pass through a material.

Sodium chloride is bad at conducting electricity, but when it dissolves in water the sodium and chloride ion can move freely and then it will be able to conduct electric current.

$\textbf{2. Freezing point}$ is the temperature at which a liquid becomes a solid.

Ice forms when water molecules are able to arrange themselves in a honeycomb like structure. If we put magnesium chloride into water, it will dissolve creating magnesium and chloride ions. Those ions will interfere with the freezing process lowering the freezing point to $-15 \text{\textdegree} C$ .

$\textbf{3. Boiling point}$ is the temperature at which a liquid becomes a gas.

Water boils at $100 \text{\textdegree} C$ , by adding certain substances, for example ethylene glycol ( $C_{2}H_{6}O_{2}$ ), we are able to raise the boiling point. This solution is most commonly used in car radiators which prevents the engine from overheating.