The ATI TEAS 7 Science section contains 50 questions — 44 scored and 6 unscored — and you have 60 minutes to answer them ATI nurse.org. Human anatomy and physiology is the heavy hitter, but chemistry makes up a meaningful slice of the remaining questions, and for many aspiring nurses it is the highest-leverage topic to master: the concepts are finite, the rules are consistent, and a few hours of focused study can reliably win you 5–8 questions you would otherwise have guessed on. This guide breaks down exactly what chemistry content appears, which topics matter most, and how to study them efficiently.
What Chemistry Content Actually Appears on the TEAS 7
ATI describes the Science section as covering anatomy and physiology, biology, chemistry, and scientific reasoning. Based on official practice materials and widely reported test experiences, the chemistry questions cluster around these areas:
- Atomic structure: protons, neutrons, electrons; atomic number vs. atomic mass; charge and ions
- The periodic table: how to read a cell, groups vs. periods, and the behavior of common elements like sodium, chlorine, hydrogen, and oxygen
- Elements, compounds, and mixtures: definitions, properties, and how to classify a given substance
- States of matter and phase changes: solid, liquid, gas; melting, freezing, boiling, condensation, sublimation
- Chemical reactions: reactants and products, balancing simple equations, conservation of mass
- Acids, bases, and pH: the pH scale, common acids and bases, neutralization
- Solutions: solute, solvent, concentration basics, and factors that affect dissolving
Notably, the TEAS does not require you to memorize complex organic synthesis or quantum chemistry. It rewards clear, applied understanding at the high-school level — which means a well-targeted study plan can cover the entire chemistry footprint in about two weeks.
The Highest-Yield Chemistry Topics, Ranked
Prioritize your study time in this order:
1. Atomic Structure (Study First, Master Fully)
Expect questions like "what does the atomic number represent?" and "how many neutrons are in this atom of carbon?" Lock in the big three: protons determine the element, electrons determine charge and reactivity, and neutrons contribute to mass. Memorize that atomic number = protons, atomic mass ≈ protons + neutrons, and an ion's charge comes from an imbalance of protons and electrons.
2. Elements vs. Compounds vs. Mixtures
This is almost guaranteed to appear. Master the decision tree: a pure substance is an element (one atom type) or a compound (chemically bonded different atoms); a mixture keeps components' identities (salt in water, air) and can be homogeneous or heterogeneous. Practice on household examples: salt water (homogeneous mixture), table salt (compound), aluminum foil (element).
3. States of Matter and Phase Changes
Understand the molecular story, not just the labels: adding energy increases particle motion; solid → liquid → gas means increasing energy. Know each transition name — melting, freezing, boiling/evaporation, condensation, sublimation, deposition — and that a phase change is physical, not chemical. The "does it change identity?" test separates physical from chemical changes, one of the most repeated distinctions on the exam.
4. Chemical Reactions and Balancing Equations
You will see classification questions: is this a combustion, synthesis, decomposition, single replacement, or double replacement reaction? For balancing, learn the two rules: matter is conserved, so atoms on each side must match; and you may only change coefficients, never subscripts. Practice balancing three or four equations by hand until the pattern clicks.
5. Acids, Bases, and pH
Memorize the pH scale direction: below 7 is acidic (lower = stronger), 7 is neutral, above 7 is basic (higher = stronger). Know the common examples — lemon juice and vinegar are acids; soap, bleach, and baking soda solutions are basic — and that acids and bases neutralize each other to form water and a salt.
6. Solutions and Concentration Basics
Know solute (the thing dissolved), solvent (the dissolver), and that "high concentration" means more solute per volume. Skip the deep stoichiometry — the TEAS rarely asks for molarity calculations, but it does love conceptual questions about how to dilute a solution or what factors speed up dissolving (temperature, stirring, surface area).
How to Study Chemistry for the TEAS — Methods That Work
Chemistry on the TEAS rewards understanding with a memory scaffold, not open-ended problem solving. Study accordingly:
- Build one master summary sheet. A single page with atomic definitions, the periodic table reading guide, phase-change diagram, reaction types, and the pH scale. Review it every morning for the whole two weeks.
- Use flashcards for definitions, but only after understanding. Terms like sublimation or compound are flashcards; why boiling is a physical change is an understanding question.
- Do 20–30 practice questions per topic. The TEAS question style is specific — multiple choice with multiple-select variants — so train on TEAS-format questions, not generic chemistry worksheets.
- Annotate the periodic table. Print one, label an element's cell (atomic number, symbol, name, atomic mass), color-code metals/nonmetals, and mark the first 20 elements' properties.
- Teach the concept aloud. The "explain it like I'm a patient" method — narrate atomic structure in plain language — exposes gaps faster than re-reading.
Common Mistakes and How to Avoid Them
- Mixing atomic number and atomic mass. Remember: the number of protons is the identity; mass is the weight of the whole nucleus. Most wrong answers swap these.
- Reversing the pH direction. Trouble recalling which end is acidic? Say it aloud: "lower = more H+ = more acidic." Connect pH 1 (stomach acid) to pH 14 (drain cleaner).
- Confusing subscripts with coefficients. Changing a subscript changes the substance — you cannot "fix" a balance by altering them.
- Calling phase changes chemical. Melting ice is still H₂O; a chemical change creates a new substance (rust, combustion, digestion).
- Rushing the unscored items. Six questions are unscored pilot items and you cannot tell which they are — treat every question seriously and never skip based on a guess about scoring.
A Two-Week Chemistry Study Plan
Week 1 — Foundations (45–60 minutes/day):
- Days 1–2: Atomic structure + periodic table reading, with 20 practice questions
- Days 3–4: Elements/compounds/mixtures + states of matter, with 25 practice questions
- Days 5–6: Chemical reactions + balancing drills
- Day 7: Full review of the master sheet + 30 mixed practice questions; mark weak spots
Week 2 — Application and Weakness Attack (30–45 minutes/day):
- Days 8–9: Acids/bases/pH + solutions; re-drill any weak topic from Week 1
- Days 10–11: Timed chemistry-question blocks (15 questions in ~18 minutes)
- Days 12–13: Full Science-section simulations under real timing (50 questions, 60 minutes)
- Day 14: Review every missed question, re-read the master sheet, sleep well before test day
Conclusion: Chemistry Is Your Most Controllable Science Points
Anatomy is memorization sprawl; chemistry is a compact, rule-based system you can fully master in fourteen focused days. Score the easy definitions, nail the distinctions TEAS loves (element vs. compound, physical vs. chemical, acidic vs. basic), and practice in the exam's own format. Done right, chemistry converts from a source of anxiety into one of the most dependable contributors to your TEAS Science score — and a quiet confidence boost heading into nursing school.
Pair this guide with a dedicated TEAS Science practice test plan: always simulate whole-section timing at least twice before your real exam, and use ATI's official practice assessments to calibrate your readiness.
