Volume 1 of the Australian Chemistry Test Item Bank, consisting of two volumes, contains nearly 2000 multiple-choice items related to the chemistry taught in Year 11 and Year 12 courses in Australia. Items which were written during 1979 and 1980 were initially published in the "ACER Chemistry Test Item Collection" and in the "ACER Chemistry Test Item Collection Supplement" in order to provide Victoria teachers with an immediate source of items for the "core" and "options" section of their new Year 12 course, pending publication of the item bank. The current publication contains most of the 542 items in these collections, together with hundreds of items which had not been released previously. The items are designed to assist teachers in the preparation of tests for diagnostic and achievement purposes. The introduction includes instructions on using the item bank and a content classification of the items in volumes 1 and 2. The appendix includes the item bank for (1) atomic structure, (2) electronic structure, (3) the periodic table, (4) the mole and chemical formulae, (5) molecular compounds, (6) infinite arrays, (7) gases, (8) solutions, (9) surfaces, (10) stoichiometry, (11) heat of reaction, (12) chemical equilibrium, (13) reaction rates, and (14) acids and bases. (Author/PN)