What phases (solid, liquid, gas) are present in the unlighted candle? in the burning candle? which phase appears to take part in the chemical reaction?

As explained below.

Explanation:

In an unlighted, the solid phase can be seen when it's in solid shape and not ignited when it starts to burn it's said to have entered into the liquid phase or wax phase. The liquid phase is to be part of the chemical reaction because the chemical reactions are seen when it is lit with the presence of oxygen and the last phase of gas is given out in the form of flames of fire upon burning as to give out carbon dioxide and ash.