What are 3 signs that a chemical reaction is happening, what tells you that this is definitely a chemical reaction?

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

so what is the problem with your lab report and whats the subject of the lab report? i will you