A sample of an element is 72.0% atoms of mass 85.0 u and 28.0% atoms of mass 87.0 u. What is its average atomic mass?Answer: 85.6 u. Source: Wikipedia, "Relative atomic mass". Written to GACE Chemistry (712) testlet 214, objective 0001
An ion has 17 protons, 20 neutrons and 18 electrons. Which describes it?Answer: Chlorine-37 with a 1− charge. Source: Wikipedia, "Mass number". Written to GACE Chemistry (712) testlet 214, objective 0001
An iron atom has 26 electrons. How are they arranged in its ground state?Answer: [Ar] 3d⁶ 4s². Source: Wikipedia, "Iron". Written to GACE Chemistry (712) testlet 214, objective 0001
An unknown metal is soft enough to cut with a knife, reacts vigorously with water to give hydrogen gas and a hydroxide, and forms a chloride of formula XCl. To which group does it belong?Answer: Group 1, the alkali metals. Source: Wikipedia, "Alkali metal". Written to GACE Chemistry (712) testlet 214, objective 0002
Sodium, magnesium and chlorine are in Period 3, and potassium sits below sodium in Group 1. Which of the four atoms is the largest?Answer: Potassium. Source: Wikipedia, "Atomic radius". Written to GACE Chemistry (712) testlet 214, objective 0002
Show all 40 questions (35 more)
Atomic structures and properties, continued
Sodium, magnesium, sulfur and argon are all in Period 3. Which of the four atoms gives up its first electron for the least energy?Answer: Sodium. Source: Wikipedia, "Ionization energy". Written to GACE Chemistry (712) testlet 214, objective 0002
The visible lines of the hydrogen spectrum, at 410, 434, 486 and 656 nm, come from electrons falling to which energy level?Answer: n = 2. Source: Wikipedia, "Balmer series". Written to GACE Chemistry (712) testlet 214, objective 0001
Which of these bonds is the most polar?Answer: H–F. Source: Wikipedia, "Electronegativity". Written to GACE Chemistry (712) testlet 214, objective 0002
Multi-atomic structures and properties 12
A balloon holds 1.5 L of air at 250. K. At constant pressure, to what temperature must the air be warmed for its volume to reach 2.1 L?Answer: 350. K. Source: Wikipedia, "Charles's law". Written to GACE Chemistry (712) testlet 215, objective 0003
A teacher dilutes 25.0 mL of 12.0 M hydrochloric acid with water to a final volume of 500. mL. What is the concentration of the diluted acid?Answer: 0.600 M. Source: Wikipedia, "Dilution (equation)". Written to GACE Chemistry (712) testlet 215, objective 0002
Aluminum forms a 3+ ion, and the sulfate ion carries a 2− charge. Which formula gives a neutral compound of the two?Answer: Al₂(SO₄)₃. Source: Wikipedia, "Aluminium sulfate". Written to GACE Chemistry (712) testlet 215, objective 0001
Carbon dioxide, water, ammonia and hydrogen fluoride all contain polar bonds. Which one is a nonpolar molecule all the same?Answer: Carbon dioxide, CO₂. Source: Wikipedia, "Chemical polarity". Written to GACE Chemistry (712) testlet 215, objective 0001
For a lab, 11.7 g of table salt, NaCl (58.44 g/mol), is dissolved and the volume brought up to 250. mL. What is the concentration in moles per liter?Answer: 0.801 M. Source: Wikipedia, "Molar concentration". Written to GACE Chemistry (712) testlet 215, objective 0002
The hydrides of Group 16 are H₂O, H₂S, H₂Se and H₂Te. Which force lifts the boiling point of water far above those of the other three?Answer: Hydrogen bonds between water molecules. Source: Wikipedia, "Hydrogen bond". Written to GACE Chemistry (712) testlet 215, objective 0003
Road crews spread salt on an icy highway. What does a dissolved, nonvolatile solute do to the freezing point of water?Answer: It lowers the freezing point. Source: Wikipedia, "Freezing-point depression". Written to GACE Chemistry (712) testlet 215, objective 0002
What is the oxidation state of iron in ferric oxide, Fe₂O₃?Answer: +3. Source: Wikipedia, "Iron(III) oxide". Written to GACE Chemistry (712) testlet 215, objective 0001
What is the shape of an ammonia molecule, NH₃?Answer: Trigonal pyramidal. Source: Wikipedia, "Ammonia". Written to GACE Chemistry (712) testlet 215, objective 0001
What pressure does 2.00 mol of an ideal gas exert in a 10.0 L tank at 305 K? (R = 0.0821 L·atm/mol·K)Answer: 5.01 atm. Source: Wikipedia, "Ideal gas law". Written to GACE Chemistry (712) testlet 215, objective 0003
Which technique separates a mixture of two miscible liquids, such as ethanol and water, by the difference in their boiling points?Answer: Fractional distillation. Source: Wikipedia, "Fractional distillation". Written to GACE Chemistry (712) testlet 215, objective 0002
While a solid melts it takes in energy, yet its temperature does not rise. What is the energy absorbed in such a change of phase called?Answer: Latent heat. Source: Wikipedia, "Latent heat". Written to GACE Chemistry (712) testlet 215, objective 0003
Chemical reactions 12
A compound is 30.4% nitrogen and 69.6% oxygen by mass. What is its empirical formula?Answer: NO₂. Source: Wikipedia, "Empirical formula". Written to GACE Chemistry (712) testlet 216, objective 0002
A gas grill burns propane, C₃H₈, with plenty of air. Which two substances does the complete reaction produce?Answer: Carbon dioxide and water. Source: Wikipedia, "Propane". Written to GACE Chemistry (712) testlet 216, objective 0001
A student claims that adding a catalyst will raise the yield of a reaction that has reached equilibrium. Why is the claim wrong?Answer: A catalyst has no effect on the equilibrium. Source: Wikipedia, "Catalysis". Written to GACE Chemistry (712) testlet 216, objective 0003
About how many atoms are in 0.250 mol of copper?Answer: 1.51 × 10²³. Source: NIST, Fundamental Physical Constants, "Avogadro constant". Written to GACE Chemistry (712) testlet 216, objective 0002
For H₂(g) + I₂(g) ⇌ 2 HI(g), analysis of a mixture at equilibrium finds 0.10 M hydrogen, 0.10 M iodine and 0.70 M hydrogen iodide. What does [HI]² ÷ ([H₂][I₂]) come to?Answer: 49. Source: Wikipedia, "Equilibrium constant". Written to GACE Chemistry (712) testlet 216, objective 0003
For N₂ + 3 H₂ → 2 NH₃, a reactor is charged with 1.0 mol of N₂ and 6.0 mol of H₂. Which reactant runs out first, and how much of the other is left over?Answer: N₂ runs out; 3.0 mol of H₂ is left. Source: Wikipedia, "Limiting reagent". Written to GACE Chemistry (712) testlet 216, objective 0002
Heated potassium chlorate breaks down: 2 KClO₃ → 2 KCl + 3 O₂. What type of reaction is this?Answer: Decomposition. Source: Wikipedia, "Chemical decomposition". Written to GACE Chemistry (712) testlet 216, objective 0001
Hydrogen burns: 2 H₂ + O₂ → 2 H₂O. What mass of water forms when 4.0 g of H₂ (2.0 g/mol) burns in excess oxygen? (H₂O: 18 g/mol)Answer: 36 g. Source: Wikipedia, "Stoichiometry". Written to GACE Chemistry (712) testlet 216, objective 0002
The hydrogen ion concentration of a solution of pH 5 is made ten times greater. What is the new pH?Answer: 4. Source: Wikipedia, "pH". Written to GACE Chemistry (712) testlet 216, objective 0001
In a set of trials, tripling the concentration of reactant A, with everything else held the same, makes the reaction nine times as fast. What is the order of the reaction in A?Answer: Second order. Source: Wikipedia, "Rate equation". Written to GACE Chemistry (712) testlet 216, objective 0003
In the reaction 2 Al + 3 Cu²⁺ → 2 Al³⁺ + 3 Cu, what happens to the aluminum?Answer: It is oxidized: it loses electrons. Source: Wikipedia, "Redox". Written to GACE Chemistry (712) testlet 216, objective 0001
The reaction N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g) gives off heat. Which change shifts the equilibrium toward more ammonia?Answer: Raising the pressure. Source: Wikipedia, "Le Chatelier's principle". Written to GACE Chemistry (712) testlet 216, objective 0003
Energy changes 8
A metal with a specific heat of 0.900 J/g·°C absorbs 1,350 J and warms by 30.0 °C. What is the mass of the sample?Answer: 50.0 g. Source: Wikipedia, "Specific heat capacity". Written to GACE Chemistry (712) testlet 217, objective 0001
A reaction takes in heat (ΔH = +50. kJ) and raises entropy (ΔS = +100. J/K). Treating both values as constant, when is the reaction spontaneous?Answer: Only above 500 K. Source: Wikipedia, "Gibbs free energy". Written to GACE Chemistry (712) testlet 217, objective 0002
In a lab, a stirred sample of gas gains 400 J of internal energy even though 150 J of heat flows out of it into the bench. How much energy must the stirrer have supplied as work?Answer: 550 J. Source: Wikipedia, "First law of thermodynamics". Written to GACE Chemistry (712) testlet 217, objective 0002
In which of these changes does the entropy of the water increase?Answer: Ice melts in a warm room. Source: Wikipedia, "Introduction to entropy". Written to GACE Chemistry (712) testlet 217, objective 0002
Melting 50.0 g of ice at 0 °C takes 16,700 J of heat. What is the enthalpy of fusion of ice, in joules per gram?Answer: 334 J/g. Source: Wikipedia, "Enthalpy of fusion". Written to GACE Chemistry (712) testlet 217, objective 0001
Reaction 1, X → Y, releases 150 kJ. Reaction 2, Y → Z, absorbs 40 kJ. What is the enthalpy change of the overall reaction X → Z?Answer: −110 kJ. Source: Wikipedia, "Hess's law". Written to GACE Chemistry (712) testlet 217, objective 0001
Squeezing an instant cold pack breaks an inner bag of water, and a solid such as ammonium nitrate or urea dissolves in it. Why does the pack turn cold?Answer: The dissolving absorbs heat from the surroundings. Source: Wikipedia, "Ice pack". Written to GACE Chemistry (712) testlet 217, objective 0001
Which substance has a standard enthalpy of formation of zero?Answer: Oxygen gas, O₂. Source: Wikipedia, "Standard enthalpy of formation". Written to GACE Chemistry (712) testlet 217, objective 0002
How this list was compiled: Our own questions, written to the framework of the GACE Chemistry (6–12) assessment, test code 712, on the GACE website of the Georgia Professional Standards Commission and Evaluation Systems, Pearson (https://www.gace.es.pearson.com/studyguide/framework/712 and https://www.gace.es.pearson.com/test/712, read 2026-10-15): four testlets, 100 selected-response questions in all: 214 Atomic Structures and Properties (about 20 questions, 45 minutes, two objectives); 215 Multi-Atomic Structures and Properties (about 30, 60 minutes, three objectives); 216 Chemical Reactions (about 30, 60 minutes, three objectives); 217 Energy Changes (about 20, 45 minutes, two objectives); the objectives of a testlet carry equal weight. This bank holds 8, 12, 12 and 8, four questions for each of the ten objectives. Every fact was read on 2026-10-15 on the page named under its question: Wikipedia and, for the Avogadro constant, the National Institute of Standards and Technology; every answer that is arithmetic was worked a second time. Licence: Questions, choices and explanations are original work of this site.
How it works
This GACE chemistry study guide is 40 practice questions of our own, spread 8, 12, 12 and 8 like the four testlets of Chemistry (6–12), test 712. Unofficial: neither the Georgia Professional Standards Commission nor Pearson is connected with it.
Read the full guide
The four testlets
Atomic Structures and Properties (214) and Energy Changes (217) have about 20 questions each; Multi-Atomic Structures and Properties (215) and Chemical Reactions (216) have about 30 each, by the framework at gace.es.pearson.com read October 15, 2026.
What each one asks
214: atomic structure, and patterns in the properties of the elements. 215: how compounds form, mixtures and their separation, states of matter. 216: chemical reactions, mass and particle number relationships, kinetics and equilibrium. 217: energy changes in physical and chemical processes, and their thermodynamics.
The clock
The two short testlets allow 45 minutes and the two long ones 60, about two minutes a question. A timed round here keeps that pace: 40 questions in 84 minutes.
Each testlet weights its objectives equally, so kinetics and equilibrium count as much as balancing equations.
About half of the 40 questions here need a calculation, so keep a calculator and a periodic table at hand.
Questions and answers
Is there an official GACE Chemistry study guide?
Yes. The GACE website has a study guide for Chemistry (6–12), test code 712, organized by the same four testlets. Our questions are written to its framework; its sample questions are not used here in any form.
How many questions are on the GACE Chemistry test?
100 selected-response questions in four testlets. The four clocks total 3 hours 30 minutes. Every testing session has 15 more minutes for a tutorial and a nondisclosure agreement.
Can you use a calculator on the GACE Chemistry test?
The GACE page for Chemistry (6–12) lists a tutorial on how to use the on-screen scientific calculator among its reference materials, with a periodic table and a sheet of constants and formulas.
What is a passing score on GACE Chemistry?
Testlet results must together produce an assessment-level score of 220 or higher, on the 100 to 300 scale, and each of the four testlets has a floor, a minimum score, to meet.