State two precautions that a student must take in order for the chromatography to be carried out successfully and explain why.​

explanation: no but i do not usually comment

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

catya your not at all which answer i've seen you do this on another question!

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.