• 50 questions

OSAT Chemistry Practice Test

Matter, reactions and energy: unofficial questions on the three selected-response subareas of Oklahoma's OSAT Chemistry test, field 104.

Which formula matches the name iron(III) sulfate?

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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Unofficial practice questions, not affiliated with Oklahoma's Office of Educational Quality and Accountability or Pearson. Bank checked October 13, 2026.

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All 50 questions

Subarea I: Structure and properties of matter 23

  • A 50.0 mL portion of a 2.00 M sugar solution is diluted with water to a total volume of 400 mL. What is the molarity of the diluted solution? Wikipedia, Molar concentration, lead. Written to the OSAT Chemistry (104) framework, competency 0004
  • A caesium nucleus holds far more protons than a lithium nucleus, yet the caesium atom is much larger. Why? Wikipedia, Atomic radius, Explanation of the general trends. Written to the OSAT Chemistry (104) framework, competency 0002
  • A compound is 40.0% sulfur and 60.0% oxygen by mass. Taking S = 32.0 and O = 16.0, what is its empirical formula? Wikipedia, Empirical formula, lead. Written to the OSAT Chemistry (104) framework, competency 0003
  • A gas mixture has a total pressure of 800 mmHg, and 25% of its molecules are oxygen. What is the partial pressure of the oxygen? Wikipedia, Dalton's law, lead and Formula. Written to the OSAT Chemistry (104) framework, competency 0005
  • A laser beam is invisible as it crosses a salt solution but shows as a bright path through a second, cloudy liquid. What does the bright path indicate? Wikipedia, Tyndall effect, lead. Written to the OSAT Chemistry (104) framework, competency 0004
Show all 50 questions (45 more)

Subarea I: Structure and properties of matter, continued

  • A strong acid solution with a pH of 2 is diluted until its hydrogen ion concentration is one tenth as great. What is the new pH? Wikipedia, pH, Origins and etymology. Written to the OSAT Chemistry (104) framework, competency 0004
  • A student records four observations of an unknown liquid. Which one is a chemical property? Wikipedia, Chemical property, lead and Examples. Written to the OSAT Chemistry (104) framework, competency 0002
  • A student sorts subatomic particles by charge and mass. Which description fits the neutron? Wikipedia, Neutron, lead. Written to the OSAT Chemistry (104) framework, competency 0001
  • A subshell list for a neutral atom ends 3d⁶ 4s² after the argon core. How many electrons does the atom have, and which element is it? Wikipedia, Iron, Chemistry and compounds. Written to the OSAT Chemistry (104) framework, competency 0001
  • At a fixed temperature, 0.030 mol of a gas dissolves in a liter of water when its partial pressure is 1.0 atm. By Henry's law, how much dissolves per liter at 2.5 atm? Wikipedia, Henry's law, lead. Written to the OSAT Chemistry (104) framework, competency 0004
  • At room temperature fluorine and chlorine are gases, bromine a liquid and iodine a solid. Which attraction between these nonpolar molecules grows stronger down the group? Wikipedia, London dispersion force, Introduction. Written to the OSAT Chemistry (104) framework, competency 0005
  • Boron trifluoride has three polar B–F bonds but no molecular dipole. Which feature of the molecule explains this? Wikipedia, Chemical polarity, Nonpolar molecules. Written to the OSAT Chemistry (104) framework, competency 0003
  • Diamond is one continuous network of carbon atoms and a poor conductor of electricity. Which class of solid is it? Wikipedia, Network covalent bonding, lead and Properties. Written to the OSAT Chemistry (104) framework, competency 0005
  • Elements 57 through 71, lanthanum through lutetium, are usually drawn in their own row below the main table. What is this series called? Wikipedia, Lanthanide, lead. Written to the OSAT Chemistry (104) framework, competency 0002
  • The four visible lines in the emission spectrum of hydrogen belong to the Balmer series. To which energy level do electrons fall as they emit these lines? Wikipedia, Balmer series, lead. Written to the OSAT Chemistry (104) framework, competency 0001
  • In a sample of an element, 60% of the atoms have a mass of 69 u and 40% have a mass of 71 u. What average atomic mass does the sample have? Wikipedia, Isotope, Stable isotopes. Written to the OSAT Chemistry (104) framework, competency 0001
  • Light above the threshold frequency shines on a metal plate. Its frequency is then raised with the intensity held steady. What happens to the electrons that leave the plate? Wikipedia, Photoelectric effect, Experimental observation of photoelectric emission. Written to the OSAT Chemistry (104) framework, competency 0001
  • One mole of glucose and one mole of sodium chloride are each dissolved in 1 kg of water. Why does the salt solution freeze at the lower temperature? Wikipedia, Colligative properties, lead, with Van 't Hoff factor. Written to the OSAT Chemistry (104) framework, competency 0004
  • Pauling electronegativities run from 0.79 to 3.98. Which two elements hold the lowest and the highest value? Wikipedia, Electronegativity, lead. Written to the OSAT Chemistry (104) framework, competency 0002
  • Phosphorus trichloride, PCl₃, is an AX₃E₁ molecule: three bonded atoms and one lone pair on phosphorus. Which shape does VSEPR theory give it? Wikipedia, VSEPR theory, Main-group elements. Written to the OSAT Chemistry (104) framework, competency 0003
  • Which formula matches the name iron(III) sulfate? Wikipedia, Iron(III) sulfate, lead. Written to the OSAT Chemistry (104) framework, competency 0003
  • Which pair of assumptions does the basic kinetic theory make about the particles of an ideal gas? Wikipedia, Kinetic theory of gases, lead. Written to the OSAT Chemistry (104) framework, competency 0005
  • Which statement gives the two general trends in first ionization energy on the periodic table? Wikipedia, Ionization energy, lead. Written to the OSAT Chemistry (104) framework, competency 0002

Subarea II: Chemical reactions 17

  • 4 Fe + 3 O₂ → 2 Fe₂O₃. A sealed vessel holds 8.0 mol of iron and 3.0 mol of oxygen. How much iron is still unreacted when the reaction stops? Wikipedia, Limiting reagent, lead. Written to the OSAT Chemistry (104) framework, competency 0007
  • A proposed mechanism has one slow elementary step and two fast ones. Which step mainly sets the overall rate? Wikipedia, Rate-determining step, lead. Written to the OSAT Chemistry (104) framework, competency 0008
  • A reaction mixture is warmed and the rate rises sharply. By collision theory, what is the main reason? Wikipedia, Collision theory, lead. Written to the OSAT Chemistry (104) framework, competency 0008
  • A reversible reaction in a sealed flask reaches equilibrium and the concentrations stop changing. What is happening at the particle level? Wikipedia, Chemical equilibrium, lead. Written to the OSAT Chemistry (104) framework, competency 0009
  • A small drop of water contains 3.011 × 10²¹ molecules. How many moles of water is that? Use 6.022 × 10²³ per mole. Wikipedia, Avogadro constant, lead. Written to the OSAT Chemistry (104) framework, competency 0007
  • A sodium atom gives one valence electron to a fluorine atom as sodium fluoride forms. Which statement is correct? Wikipedia, Redox, lead and Terminology. Written to the OSAT Chemistry (104) framework, competency 0006
  • A strip of metal A is placed in a solution of the salt BC, where B is another metal. When is the single displacement A + BC → AC + B most likely to occur? Wikipedia, Single displacement reaction, lead. Written to the OSAT Chemistry (104) framework, competency 0006
  • An energy diagram shows a catalyzed pathway beside the uncatalyzed one for the same reaction. What differs between the two curves, and what does not? Wikipedia, Catalysis, lead and General principles. Written to the OSAT Chemistry (104) framework, competency 0008
  • An ionic solid MX sits in equilibrium with its saturated solution. A soluble salt that also contains the X ion is stirred in. What happens to the solubility of MX? Wikipedia, Common-ion effect, lead. Written to the OSAT Chemistry (104) framework, competency 0009
  • For a reaction mixture the reaction quotient Q is 0.2 and the equilibrium constant K is 5. What does the mixture do? Wikipedia, Reaction quotient, Applications. Written to the OSAT Chemistry (104) framework, competency 0009
  • How many moles of sodium hydroxide, NaOH, are needed to neutralize 0.50 mol of sulfuric acid, H₂SO₄, completely? Wikipedia, Neutralization (chemistry), Meaning of "neutralization". Written to the OSAT Chemistry (104) framework, competency 0006
  • H₂(g) + I₂(g) ⇌ 2 HI(g) is at equilibrium when the vessel is squeezed to half its volume. Which way does the equilibrium shift? Wikipedia, Le Chatelier's principle, Effect of change in volume. Written to the OSAT Chemistry (104) framework, competency 0009
  • In a rate study of X + Y → Z, tripling the concentration of X raises the initial rate ninefold, while changing the concentration of Y has no effect. What is the overall reaction order? Wikipedia, Rate equation, lead. Written to the OSAT Chemistry (104) framework, competency 0008
  • In an acid-base titration, the indicator in the flask changes color. What does the change signal? Wikipedia, Titration, Procedure. Written to the OSAT Chemistry (104) framework, competency 0007
  • N₂ + 3 H₂ → 2 NH₃. What mass of ammonia forms from 6.0 g of hydrogen and excess nitrogen? Take H₂ = 2.0 g/mol and NH₃ = 17.0 g/mol. Wikipedia, Stoichiometry, Determining amount of product. Written to the OSAT Chemistry (104) framework, competency 0007
  • Propane, C₃H₈, burns completely to carbon dioxide and water. With a coefficient of 1 on propane, what coefficient balances O₂? Wikipedia, Propane, Properties and reactions. Written to the OSAT Chemistry (104) framework, competency 0007
  • Sodium carbonate solution and copper(II) sulfate solution are mixed, and solid copper(II) carbonate forms. Which ions are spectators, left out of the net ionic equation? Wikipedia, Spectator ion, lead. Written to the OSAT Chemistry (104) framework, competency 0006

Subarea III: Energy changes 10

  • A Born–Haber cycle for lithium fluoride adds up measured steps such as ionization energy and electron affinity. Which quantity is the cycle mainly used to find? Wikipedia, Born–Haber cycle, lead. Written to the OSAT Chemistry (104) framework, competency 0010
  • A chemist cannot measure ΔH for X → Z directly. She measures X → Y at +40 kJ and Z → Y at −25 kJ. What is ΔH for X → Z? Wikipedia, Hess's law, lead. Written to the OSAT Chemistry (104) framework, competency 0011
  • A heating curve has sloped parts, where the temperature climbs, and flat parts, where it does not. Which term names the heat added along a sloped part? Wikipedia, Latent heat, lead. Written to the OSAT Chemistry (104) framework, competency 0010
  • A hot 200 g metal block is dropped into a calorimeter holding 100 g of water. The block cools by 60.0 °C and the water warms by 12.0 °C. With 4.18 J/(g·°C) for water, what is the specific heat of the metal? Wikipedia, Specific heat capacity, lead. Written to the OSAT Chemistry (104) framework, competency 0010
  • During one stroke, 80 J of heat flows into the gas in a cylinder while the expanding gas does 80 J of work on the piston. By how much does the internal energy of the gas change? Wikipedia, First law of thermodynamics, Original statements. Written to the OSAT Chemistry (104) framework, competency 0011
  • Fusing light nuclei releases energy, and so does splitting very heavy nuclei. Near which element does this pattern turn over? Wikipedia, Nuclear binding energy, Mass defect. Written to the OSAT Chemistry (104) framework, competency 0010
  • Gibbs free energy is G = H − TS. A process takes in heat (positive ΔH) and raises entropy (positive ΔS). When is it spontaneous? Wikipedia, Gibbs free energy, lead. Written to the OSAT Chemistry (104) framework, competency 0011
  • In a Daniell cell zinc is oxidized at the anode and copper ions are reduced at the cathode. With standard reduction potentials of +0.34 V for copper and −0.76 V for zinc, what is the standard cell potential? Wikipedia, Standard electrode potential, Standard reduction potential table, with Daniell cell, lead. Written to the OSAT Chemistry (104) framework, competency 0011
  • One flask holds helium and another holds argon, both at 300 K. By kinetic theory, which quantity is the same in both flasks? Wikipedia, Kinetic theory of gases, Temperature and kinetic energy. Written to the OSAT Chemistry (104) framework, competency 0010
  • Which event in an isolated system would break the second law of thermodynamics? Wikipedia, Second law of thermodynamics, Direction of spontaneous processes. Written to the OSAT Chemistry (104) framework, competency 0011

How this list was compiled: Our own questions, written to the test design and framework of Oklahoma Subject Area Tests field 104, Chemistry, in the study guide on the Certification Examinations for Oklahoma Educators website (https://www.ceoe.nesinc.com/Content/StudyGuide/OK_SG_OBJ_104.htm, copyright 2023 Office of Educational Quality and Accountability and Pearson Education, Inc.; test page https://www.ceoe.nesinc.com/TestView.aspx?f=HTML_FRAG/OK104_TestPage.html, read 2026-10-13): 80 selected-response questions and 1 constructed-response assignment in 4 hours, passing score 240, an on-screen scientific calculator and a periodic table provided; selected response weighs Structure and Properties of Matter (competencies 0001 to 0005) 39%, Chemical Reactions (0006 to 0009) 29% and Energy Changes (0010 to 0011) 17%, and the constructed response (0012) 15%. The bank holds 50: 23, 17 and 10, with four or five for each of the eleven selected-response competencies. Every rule and fact was read in the Wikipedia article and section named under its question, and each calculation was worked a second time from the numbers in the question. Licence: Questions, choices and explanations are original work of this site.

How it works

This free, unofficial OSAT Chemistry practice test has 50 original questions on field 104's eleven selected-response competencies, each with its public source. The test's owners, Oklahoma's Office of Educational Quality and Accountability and Pearson, are not affiliated with it.

Read the full guide

What OSAT Chemistry (104) weighs most

Field 104's framework, read on the CEOE site on October 13, 2026, gives Structure and Properties of Matter 39% of the test, Chemical Reactions 29% and Energy Changes 17%. The 50 questions here keep that order: 23, 17 and 10.

The written 15% is not practiced here

The last 15% of the test is one written assignment, and no question here practices it. Each calculation states the atomic masses and constants it needs, so a round can be worked without a periodic table.

  • Competency 0005, states of matter, names three gas relationships: the ideal gas law, Dalton's law of partial pressures and the van der Waals equation.

Questions and answers

How many questions are on the OSAT Chemistry test?

Field 104 has 80 selected-response questions and one constructed-response assignment, the test page says, with 4 hours of testing after a 15-minute tutorial. A form may include trial questions that do not affect the score.

What is the passing score for OSAT Chemistry?

240, by the test page. The written assignment counts toward it, so a count of right answers here has no scaled equivalent, and a round ends with no pass or fail.

Do you get a periodic table on the OSAT Chemistry test?

Yes. The test page lists a periodic table and an on-screen scientific calculator as provided with the test. It adds that the written assignment may be answered by hand and scanned.

What is on the OSAT Chemistry test?

Atomic structure, periodic trends, bonding, mixtures and states of matter; then reaction types, stoichiometry, kinetics and equilibrium; then energy changes and thermodynamics. The written assignment adds a laboratory investigation, safe chemical storage and disposal included.

Is OSAT Chemistry a CEOE test?

Yes. The Certification Examinations for Oklahoma Educators list Chemistry, field 104, among the Oklahoma Subject Area Tests, apart from Physical Science (113) and Physics (114).

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