Selecting and using instruments and being able to connect them correctly into an experimental setup is an important part of conducting a chemistry experiment. The general sequence of apparatus assembly is:
(1) Select the apparatus and accessories according to the apparatus diagram.
(2) assemble in an orderly manner, generally "from left to right, bottom to top".
(3) Check the airtightness of the device (i.e., whether it is tight and does not leak).