The principal scope is to realize chemical reactions on a very small scale. Also: storing liquid or solid substances, solubility experiments, etc. A test tube is a cylindrical tube, made from...
A test tube is a piece of special glass, of different sizes, that can be heated or get cold. You can test small-sized chemical reactions in this tube, by combining chemicals or by heating it to see...
The starch solution will turn black, while the distilled water will remain brown, the same colour as the iodine. This is actually because water, normally used as a control, does not contain any...