• 51 questions

OAE Chemistry Practice Test

Unofficial practice for Ohio's OAE Chemistry assessment (009), spread over its five domains and 17 competencies.

A sheet of foil measures 12.4 cm by 3.1 cm. With the correct number of significant figures, what is its area?

Pick an answer, then press Check answer. Then you see Correct or Not quite, with the reason. Keys: A to D pick, Enter checks.

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Exam mode: 51 questions, 77 minutes.

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Unofficial practice questions, not affiliated with the Ohio State Board of Education or Evaluation Systems, Pearson. Bank checked October 12, 2026.

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All 51 questions

Domain I: Nature of science 9

  • A green chemistry measure compares the mass of the atoms in the desired product with the mass of all the atoms in the reactants. What is it called? Wikipedia, "Atom economy". Written to OAE Chemistry (009) framework, competency 0003
  • A sheet of foil measures 12.4 cm by 3.1 cm. With the correct number of significant figures, what is its area? Wikipedia, "Significant figures". Written to OAE Chemistry (009) framework, competency 0001
  • A stockroom shelf is labeled "oxidizers". What makes an oxidizer a hazard in storage? Wikipedia, "Oxidizing agent". Written to OAE Chemistry (009) framework, competency 0001
  • A student measures the density of aluminum as 2.57 g/cm³. The accepted value is 2.70 g/cm³. What is the percent error? Wikipedia, "Approximation error". Written to OAE Chemistry (009) framework, competency 0001
  • Boyle's law states how the pressure and volume of a gas are related. The kinetic molecular theory explains why. What does this pair show about laws and theories in science? Wikipedia, "Scientific law". Written to OAE Chemistry (009) framework, competency 0002
  • The Haber process made synthetic fertilizer possible on an industrial scale. Which two gases does it combine to make ammonia? Wikipedia, "Haber process". Written to OAE Chemistry (009) framework, competency 0003
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Domain I: Nature of science, continued

  • In 1989 two chemists announced that they had produced nuclear fusion at room temperature in a tabletop cell. Why did the scientific community come to reject the claim? Wikipedia, "Cold fusion". Written to OAE Chemistry (009) framework, competency 0003
  • Water from a river, a cloud or a laboratory flask always holds the same fraction of oxygen by mass. Which law does this illustrate? Wikipedia, "Law of definite proportions". Written to OAE Chemistry (009) framework, competency 0002
  • Which chemist's careful weighing of substances before and after combustion replaced the phlogiston theory with the idea that burning is combination with oxygen? Wikipedia, "Phlogiston theory". Written to OAE Chemistry (009) framework, competency 0002

Domain II: Matter and atomic structure 9

  • A 24.6 L weather balloon holds 2.00 mol of helium at 300 K. What is the pressure inside? (R = 0.0821 L·atm/mol·K) Wikipedia, "Ideal gas law". Written to OAE Chemistry (009) framework, competency 0006
  • A diving gas mixture is 21% oxygen by moles. When the total pressure of the mixture is 100 kPa, what pressure does the oxygen alone exert? Wikipedia, "Partial pressure". Written to OAE Chemistry (009) framework, competency 0006
  • A photon of violet light has a wavelength of about 400 nm, and a photon of red light about 700 nm. Which photon carries more energy? Wikipedia, "Photon energy". Written to OAE Chemistry (009) framework, competency 0005
  • A student must separate salt water into pure water and dry salt, keeping both. Which method does this? Wikipedia, "Distillation". Written to OAE Chemistry (009) framework, competency 0004
  • Iodine-131 (atomic number 53) decays by beta-minus emission. Which nuclide is formed? Wikipedia, "Iodine-131". Written to OAE Chemistry (009) framework, competency 0004
  • Moving from sodium to argon across period 3, what generally happens to the first ionization energy? Wikipedia, "Ionization energy". Written to OAE Chemistry (009) framework, competency 0005
  • What is the greatest number of electrons that a d subshell can hold? Wikipedia, "Electron configuration". Written to OAE Chemistry (009) framework, competency 0005
  • Which of these substances is a compound, not an element or a mixture? Wikipedia, "Chemical compound". Written to OAE Chemistry (009) framework, competency 0004
  • Why does food cook faster in a sealed pressure cooker than in an open pot of boiling water? Wikipedia, "Pressure cooking". Written to OAE Chemistry (009) framework, competency 0006

Domain III: Energy and chemical bonding 12

  • A cup holds water at 80 °C and a bathtub holds water at 40 °C. Which statement is correct? Wikipedia, "Temperature". Written to OAE Chemistry (009) framework, competency 0007
  • A reaction absorbs heat (ΔH is positive) and increases entropy (ΔS is positive). Under what conditions is it spontaneous? Wikipedia, "Spontaneous process". Written to OAE Chemistry (009) framework, competency 0007
  • An instant cold pack turns cold when the ammonium nitrate inside dissolves in water. What does this show about the dissolving? Wikipedia, "Ice pack". Written to OAE Chemistry (009) framework, competency 0008
  • During a reaction in a foam cup, 50.0 g of water warms by 6.0 °C. About how much heat did the water absorb? (Specific heat of water = 4.18 J/g·°C) Wikipedia, "Specific heat capacity". Written to OAE Chemistry (009) framework, competency 0007
  • Each C=O bond in carbon dioxide is polar, yet the molecule as a whole is nonpolar. Why? Wikipedia, "Chemical polarity". Written to OAE Chemistry (009) framework, competency 0010
  • Given C(s) + O₂(g) → CO₂(g), ΔH = −393.5 kJ, and CO(g) + ½O₂(g) → CO₂(g), ΔH = −283.0 kJ, what is ΔH for C(s) + ½O₂(g) → CO(g)? Wikipedia, "Hess's law". Written to OAE Chemistry (009) framework, competency 0008
  • In an exothermic reaction, how does the energy of bond forming compare with the energy of bond breaking? Wikipedia, "Endothermic process". Written to OAE Chemistry (009) framework, competency 0008
  • Pentane, 2-methylbutane and dimethylpropane all have the formula C₅H₁₂ but differ in how their carbon atoms are joined. What is the relationship among them? Wikipedia, "Structural isomer". Written to OAE Chemistry (009) framework, competency 0009
  • Water boils at a far higher temperature than its small molecular mass would suggest. What accounts for this? Wikipedia, "Hydrogen bond". Written to OAE Chemistry (009) framework, competency 0010
  • What is the IUPAC name of Fe₂O₃? Wikipedia, "Iron(III) oxide". Written to OAE Chemistry (009) framework, competency 0009
  • What is the molecular geometry of ammonia, NH₃? Wikipedia, "Ammonia". Written to OAE Chemistry (009) framework, competency 0009
  • Which of these compounds is held together by ionic bonds? Wikipedia, "Ionic bonding". Written to OAE Chemistry (009) framework, competency 0010

Domain IV: Chemical reactions 12

  • A buffer is made with equal concentrations of acetic acid (pKa = 4.76) and sodium acetate. What is its pH? Wikipedia, "Henderson–Hasselbalch equation". Written to OAE Chemistry (009) framework, competency 0013
  • A galvanic cell is built from a zinc electrode in zinc sulfate and a copper electrode in copper sulfate. Which metal is the anode, and what happens there? Wikipedia, "Daniell cell". Written to OAE Chemistry (009) framework, competency 0014
  • A steel spoon is to be plated with silver by electrolysis. To which electrode is the spoon connected? Wikipedia, "Electroplating". Written to OAE Chemistry (009) framework, competency 0014
  • A strip of zinc and the same mass of zinc powder are dropped into equal volumes of the same acid. Why does the powder react faster? Wikipedia, "Chemical kinetics". Written to OAE Chemistry (009) framework, competency 0011
  • Carbon monoxide and hydrogen are at equilibrium with methanol: CO + 2 H₂ ⇌ CH₃OH. More carbon monoxide is pumped into the vessel. What does Le Chatelier's principle predict? Wikipedia, "Le Chatelier's principle". Written to OAE Chemistry (009) framework, competency 0012
  • For a reaction with Kc = 50, a mixture is prepared whose reaction quotient Q is 20. Which way does the reaction proceed? Wikipedia, "Reaction quotient". Written to OAE Chemistry (009) framework, competency 0012
  • For N₂O₄(g) ⇌ 2 NO₂(g), an equilibrium mixture holds 0.040 M N₂O₄ and 0.020 M NO₂. What is the value of Kc? Wikipedia, "Equilibrium constant". Written to OAE Chemistry (009) framework, competency 0012
  • In a titration, 25.0 mL of hydrochloric acid is exactly neutralized by 20.0 mL of 0.150 M sodium hydroxide. What is the concentration of the acid? Wikipedia, "Titration". Written to OAE Chemistry (009) framework, competency 0013
  • In the reaction 2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂, which element is reduced? Wikipedia, "Redox". Written to OAE Chemistry (009) framework, competency 0014
  • In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, what role does water play? Wikipedia, "Brønsted–Lowry acid–base theory". Written to OAE Chemistry (009) framework, competency 0013
  • The rate law for a reaction is rate = k[NO]²[O₂]. If the concentration of NO is tripled while that of O₂ is held constant, how does the rate change? Wikipedia, "Rate equation". Written to OAE Chemistry (009) framework, competency 0011
  • When limestone is heated strongly in a kiln, CaCO₃ → CaO + CO₂. Which type of reaction is this? Wikipedia, "Chemical decomposition". Written to OAE Chemistry (009) framework, competency 0011

Domain V: Stoichiometry and solutions 9

  • A beam of light is clearly visible as it passes through a mixture of milk and water but not through salt water. What is this scattering of light by a colloid called? Wikipedia, "Tyndall effect". Written to OAE Chemistry (009) framework, competency 0017
  • A procedure calls for 0.250 mol of calcium carbonate. What mass should be weighed out? (Molar mass = 100.09 g/mol) Wikipedia, "Molar mass". Written to OAE Chemistry (009) framework, competency 0015
  • A reaction should give 12.5 g of product in theory. A student collects 10.0 g. What is the percent yield? Wikipedia, "Yield (chemistry)". Written to OAE Chemistry (009) framework, competency 0016
  • Aluminum and chlorine react by 2 Al + 3 Cl₂ → 2 AlCl₃. A flask holds 4.0 mol of Al and 3.0 mol of Cl₂. How much aluminum is left over when the reaction ends? Wikipedia, "Limiting reagent". Written to OAE Chemistry (009) framework, competency 0016
  • Analysis of a sweetener shows 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. Which empirical formula fits these figures? (C = 12.01, H = 1.008, O = 16.00) Wikipedia, "Empirical formula". Written to OAE Chemistry (009) framework, competency 0015
  • Each of these solutions is 1.0 molal in water. Which has the lowest freezing point? Wikipedia, "Freezing-point depression". Written to OAE Chemistry (009) framework, competency 0017
  • How many grams of sodium hydroxide (40.00 g/mol) are needed to prepare 500 mL of a 0.200 M solution? Wikipedia, "Molar concentration". Written to OAE Chemistry (009) framework, competency 0017
  • In the balanced form of Fe + Cl₂ → FeCl₃ with the smallest whole numbers, how many molecules of Cl₂ are needed for every 2 atoms of Fe? Wikipedia, "Chemical equation". Written to OAE Chemistry (009) framework, competency 0016
  • What is the percent by mass of oxygen in water, H₂O? (H = 1.008, O = 16.00) Wikipedia, "Mass fraction (chemistry)". Written to OAE Chemistry (009) framework, competency 0015

How this list was compiled: Our own questions, written to the assessment framework for Ohio Assessments for Educators field 009, Chemistry, read 2026-10-12 on the program's site (https://www.oh.nesinc.com/CONTENT/STUDYGUIDE/OH_SG_OBJ_009.htm; test page https://www.oh.nesinc.com/TestView.aspx?f=HTML_FRAG/OH009_TestPage.html): 150 multiple-choice questions in 225 minutes, passing score 220; Nature of Science (competencies 0001 to 0003, 18%), Matter and Atomic Structure (0004 to 0006, 18%), Energy and Chemical Bonding (0007 to 0010, 23%), Chemical Reactions (0011 to 0014, 23%) and Stoichiometry and Solutions (0015 to 0017, 18%). The bank holds 3 questions for each of the 17 competencies. Every fact was read on 2026-10-12 in the Wikipedia article the question names, and every numeric answer was worked a second time. Licence: Questions, choices and explanations are original work of this site.

How it works

Work 51 chemistry questions of our own, three on each of the 17 competencies of OAE assessment 009. The page is unofficial practice and is not affiliated with the Ohio State Board of Education or with Evaluation Systems, Pearson.

Read the full guide

What OAE Chemistry (009) covers

The framework at oh.nesinc.com, read October 12, 2026, weighs Nature of Science 18%, Matter and Atomic Structure 18%, Energy and Chemical Bonding 23%, Chemical Reactions 23%, and Stoichiometry and Solutions 18%. Here that is 9, 9, 12, 12 and 9 questions.

Timing

Chemistry allows 3 hours 45 minutes of testing, 1.5 minutes a question, after a 15-minute tutorial. The timed exam here gives 77 minutes for its 51 questions.

What the test provides

The test page lists an on-screen scientific calculator, a formulas and constants page, and a periodic table. A question here that needs a molar mass or a constant prints it.

  • The gas-law, calorimetry, equilibrium and stoichiometry answers are worked step by step in their explanations. Try each on paper before you look.

Questions and answers

Is this OAE Chemistry practice test free?

Yes, with no sign-up and no fee. The 51 questions were written for this site from the published framework of test 009. Each explanation names the public article behind it, and nothing is taken from the real assessment or its sample questions.

How many questions are on the OAE Chemistry test?

150 multiple-choice questions. The test page notes that some may be questions being evaluated for future use, which do not affect a score.

What is the passing score for OAE Chemistry?

220 of a possible 300. The State Board of Education sets the minimum, and the scaled total reflects the multiple-choice questions answered correctly, so no count of right answers here stands in for it.

Is the OAE Chemistry test offered online?

The test page for 009 lists computer-based testing at test centers, in Ohio and nationwide, by appointment year round. It does not list the online proctor that some other OAE assessments have.

Which Ohio licenses need OAE Chemistry?

The program's table lists 009 for four Adolescence to Young Adult (7–12) licenses: Physical Sciences: Chemistry, Physical Sciences (Chemistry and Physics), Life Sciences/Chemistry and Earth Sciences/Chemistry, each with Assessment of Professional Knowledge 003.

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