ILTS Science: Chemistry (240)

It is a computer-based, multiple-choice test delivered at Pearson VUE test centers. Questions are mostly four-option items, some tied to short scenarios or data tables. There are no essays or hands-on lab tasks. Confirm current delivery details and any scheduling options on the Illinois State Board of Education's licensure testing pages.

The content is roughly a rigorous undergraduate general chemistry sequence plus introductory organic, biochemistry, and nuclear topics. The difficulty is breadth and pace rather than trick questions. Candidates who have not taken organic chemistry or who have forgotten stoichiometry and equilibrium calculations usually find those areas hardest.

The state contracts the test administrator to set the current question count and testing time, and these change periodically. Check the official Illinois licensure testing website for the exact number of questions and the appointment length before you build a pacing plan.

Illinois uses a scaled passing standard set by the state, not a simple percentage of items correct. The current passing score and score-report timing are published by the Illinois State Board of Education and its testing vendor. Look up the figure on those official sites rather than trusting forum posts.

Yes, retakes are generally allowed, but Illinois sets waiting periods, registration steps, and fees that can change. The official testing website lists the current retake policy, including any required waiting time between attempts. Plan your first attempt early enough that a retake still fits your licensure timeline.

Start with atomic structure, periodicity, bonding, and stoichiometry, since equilibrium, solutions, and electrochemistry all depend on them. Then move to thermochemistry, kinetics, and equilibrium, followed by acids and bases and electrochemistry. Finish with organic, biochemistry, and nuclear chemistry, then lab safety and inquiry, and finally instructional practice.

Frequent problems include weak calculation fluency under time pressure, confusing equilibrium and kinetics concepts, misreading solubility and acid-base rules, and neglecting the smaller inquiry, safety, and pedagogy domains. Others underestimate organic nomenclature and functional groups. Practicing timed mixed-topic sets exposes these gaps better than rereading notes.

Review standard high school lab rules, chemical storage and waste handling, hazard communication, and safe use of glassware and heating equipment. Practice interpreting graphs, significant figures, percent error, and experimental design. These questions reward careful reading of procedures and data rather than memorized facts.

Yes, a small portion covers instructional practice in chemistry, such as selecting representations, addressing misconceptions, and planning investigations. It is a minor share of the test, so do not let it crowd out content review, but do not skip it entirely, since those items are often straightforward.

Registration, test dates, fees, identification requirements, and score reporting are handled through the Illinois State Board of Education's designated testing vendor. Use those official pages for every number and policy, and treat third-party summaries as leads to verify rather than final answers.