you stick a thermometer in the liquid
Distillation.
These liquids have different chemical composition and structure.
This depends on each material: at low temperatures liquids become solids and gases also liquids and after this solids.
At standard temperatures and pressures, most metals are not liquids (the exception is mercury).
Not necessarily. Both liquids and gases can exist over a wide range of temperatures.
Some examples of liquids that burn at very low temperatures include alcohol (such as ethanol and methanol), acetone, and gasoline. These liquids have relatively low flashpoints, making them highly flammable and able to ignite at low temperatures.
Liquids take the shape of the container they are in.
They are all liquids at normal temperatures.
Not all liquids can be changed into a solid. Only liquids that have the ability to freeze - meaning they have a freezing point above absolute zero - can be converted into a solid. Liquids like water can be turned into ice, but substances like mercury, which remains liquid at extremely low temperatures, cannot be solidified under normal conditions.
Yes but they require specific temperatures to react.
Liquids will take up the shape of the container.
Some examples of liquids that do not freeze at typical temperatures include liquid nitrogen, liquid helium, and liquid mercury.