Career upgrade: Learn practical AI skills for better jobs and higher pay.
Level up
PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free ORELA Chemistry (NT321) Practice Questions

Pass your Oregon Educator Licensure Assessments Chemistry (NT321) exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
Not publicly reported Pass Rate
100+ Questions
100% Free
1 / 100
Question 1
Score: 0/0

What is the net ionic equation for mixing aqueous solutions of AgNO3 and NaCl?

A
B
C
D
to track
Same family resources

Explore More State Teacher Licensure Exams

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

NYSTCE

Practice QuestionsStudy GuideCheat SheetFlashcards1 blog

NES

Practice Questions1 blog

WEST-B

Practice Questions1 blog

AEPA

Practice Questions

CEOE

Practice Questions

ILTS

Practice Questions

More From This Family

Videos and articles for deeper review.

ArticleFREE NYSTCE Exam Guide 2026: New York Teacher Tests10 min readArticleNES Exam Guide 2026: Choose the Right Test and Prep Without Wasted Hours12 min readArticleWEST-B Exam Guide 2026: Washington Basic Skills Without Old Cut-Score Panic4 min read
2026 Statistics

Key Facts: ORELA Chemistry (NT321) Exam

NT321

Current ORELA Chemistry test code

ORELA Tests List

100

Multiple-choice questions

ORELA Chemistry NT321 Profile

2h 30m

Testing time

ORELA Chemistry NT321 Test Page

$119

Posted test fee

ORELA Chemistry NT321 Test Page

220

Passing score

ORELA Chemistry NT321 Test Page

50%

Largest domain: structure and properties

ORELA/NES Chemistry NT321 Profile

ORELA currently lists Chemistry as test code NT321. The test has 100 multiple-choice questions, 2 hours and 30 minutes of testing time within a 2-hour-and-45-minute appointment, a passing score of 220, a posted fee of $119, and three official content domains weighted 50%, 30%, and 20%. ORELA's 2025 NES update notice says the older Chemistry test was offered only through August 31, 2025 and replaced by the updated Chemistry test first administered June 30, 2025.

Sample ORELA Chemistry (NT321) Practice Questions

Try these sample questions to test your ORELA Chemistry (NT321) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An atom has 17 protons, 18 neutrons, and 17 electrons. Which description is correct?
A.It is a neutral chlorine atom with mass number 35.
B.It is a chloride ion with mass number 17.
C.It is a neutral argon atom with mass number 35.
D.It is a chlorine isotope with atomic number 18.
Explanation: Atomic number is the number of protons, so 17 protons identifies chlorine. The mass number is protons plus neutrons, 17 + 18 = 35, and equal numbers of protons and electrons make the atom neutral.
2Which pair of atoms represents isotopes of the same element?
A.C-12 and N-14
B.O-16 and O-18
C.Na-23 and Mg-24
D.Cl-35 and Ar-40
Explanation: Isotopes are atoms of the same element that have different numbers of neutrons and therefore different mass numbers. O-16 and O-18 are both oxygen atoms, so they have the same number of protons but different masses.
3Which ground-state electron configuration represents a neutral magnesium atom?
A.1s2 2s2 2p6
B.1s2 2s2 2p6 3s1
C.1s2 2s2 2p6 3s2
D.1s2 2s2 2p6 3s2 3p6
Explanation: Magnesium has atomic number 12, so a neutral atom has 12 electrons. Filling orbitals in order gives 1s2 2s2 2p6 3s2.
4A sample emits alpha particles during radioactive decay. What change occurs in the nucleus of each decaying atom?
A.The atomic number increases by 1 and the mass number stays the same.
B.The atomic number decreases by 2 and the mass number decreases by 4.
C.The atomic number stays the same and the mass number decreases by 1.
D.The atomic number decreases by 4 and the mass number decreases by 2.
Explanation: An alpha particle is a helium nucleus containing 2 protons and 2 neutrons. Losing it lowers the atomic number by 2 and the mass number by 4.
5A hydrogen atom emits light when an electron falls from n = 4 to n = 2. Which statement best explains the emitted photon?
A.Its energy equals the difference between the two electron energy levels.
B.Its energy equals the total binding energy of all electrons in hydrogen.
C.Its wavelength is independent of the electron transition.
D.It is emitted because the nucleus changes identity.
Explanation: Atomic emission occurs when an electron moves to a lower allowed energy level and releases the energy difference as a photon. The discrete level spacing produces line spectra with characteristic wavelengths.
6Why are very large nuclei often unstable?
A.Their electrons repel the nucleus more strongly than in small atoms.
B.Their many protons create strong electrostatic repulsions that are not fully offset by the strong nuclear force.
C.Their neutrons have positive charge and repel the protons.
D.Their valence electrons occupy too many orbitals.
Explanation: As proton number increases, proton-proton repulsion grows throughout the nucleus. The strong nuclear force acts over very short distances, so large nuclei often need extra neutrons and may still be unstable.
7Which electron configuration is expected for a Ca2+ ion?
A.1s2 2s2 2p6 3s2 3p6
B.1s2 2s2 2p6 3s2 3p6 4s2
C.1s2 2s2 2p6 3s2 3p4
D.1s2 2s2 2p6 3s2 3p6 4s1
Explanation: Neutral calcium has 20 electrons and loses the two 4s electrons to form Ca2+. The resulting ion has 18 electrons, the same configuration as argon.
8Chlorine has two common isotopes: Cl-35 with 75.8% abundance and Cl-37 with 24.2% abundance. Which value is closest to the average atomic mass?
A.35.0 amu
B.35.5 amu
C.36.0 amu
D.37.0 amu
Explanation: The weighted average is closer to 35 than to 37 because Cl-35 is much more abundant. Estimating 0.758(35) + 0.242(37) gives about 35.5 amu.
9A radioactive isotope has a half-life of 8.0 days. How long will it take for an 80.0 g sample to decay to 10.0 g?
A.8.0 days
B.16.0 days
C.24.0 days
D.32.0 days
Explanation: The mass changes from 80.0 g to 40.0 g to 20.0 g to 10.0 g, which is three half-lives. Three half-lives at 8.0 days each is 24.0 days.
10A photon with wavelength 400 nm and a photon with wavelength 800 nm are compared. Which statement is correct?
A.The 800 nm photon has twice the energy of the 400 nm photon.
B.The 400 nm photon has twice the energy of the 800 nm photon.
C.Both photons have the same energy because both are light.
D.The energy ratio cannot be determined without the light intensity.
Explanation: Photon energy is inversely proportional to wavelength, E = hc/lambda. Halving the wavelength from 800 nm to 400 nm doubles the photon energy.

About the ORELA Chemistry (NT321) Exam

ORELA Chemistry (NT321) is the current Oregon National Evaluation Series chemistry assessment for educator licensure. Pearson's official profile organizes the test into three weighted domains: Structure and Properties of Matter, Chemical Reactions, and Energy Changes.

Assessment

100 multiple-choice questions

Time Limit

2h 30m testing time (2h 45m total appointment)

Passing Score

220 scaled score

Exam Fee

$119 (Oregon Educator Licensure Assessments (ORELA) / Pearson)

ORELA Chemistry (NT321) Exam Content Outline

50%

Structure and Properties of Matter

Atomic systems, evidence for atomic models, subatomic particles, nuclear stability and nuclear processes, isotopes and atomic mass, electron configurations, electromagnetic energy, periodic-table structure, periodic trends, Coulombic explanations, ionic, covalent, metallic, and network bonding, Lewis structures, VSEPR, molecular polarity, organic and inorganic nomenclature, mixtures, solutions, concentration units, solubility, acids and bases, intermolecular forces, states of matter, solids, phase changes, and gas-law reasoning.

30%

Chemical Reactions

Chemical notation, balanced equations, net ionic equations, synthesis, decomposition, replacement, precipitation, combustion, acid-base, redox, electrochemical cells, mole and particle relationships, percent composition, empirical and molecular formulas, limiting reactants, titration, gravimetric analysis, theoretical yield, percent error, collision theory, reaction-rate factors, rate laws, mechanisms, dynamic equilibrium, equilibrium constants, Le Chatelier's principle, weak acid/base equilibria, buffers, common-ion effects, and solubility products.

20%

Energy Changes

Endothermic and exothermic processes, heating curves, phase diagrams, calorimetry, specific heat capacity, thermal equilibrium, temperature and average kinetic energy, Maxwell-Boltzmann distributions, bond energies, potential-energy and enthalpy diagrams, Born-Haber reasoning, energy in fission, fusion, and radioactive decay, thermodynamic laws, entropy, enthalpy, Gibbs free energy, spontaneity, equilibrium connections, and electrochemical cell potential.

How to Pass the ORELA Chemistry (NT321) Exam

What You Need to Know

  • Passing score: 220 scaled score
  • Assessment: 100 multiple-choice questions
  • Time limit: 2h 30m testing time (2h 45m total appointment)
  • Exam fee: $119

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ORELA Chemistry (NT321) Study Tips from Top Performers

1Use the official 50/30/20 profile to allocate study time; Structure and Properties of Matter deserves the largest block because it is half of the test.
2Build fluency with periodic trends, electron configurations, VSEPR shapes, intermolecular forces, solution concentration, acid-base basics, gas laws, and phase changes before harder calculation sets.
3For reaction questions, first classify the reaction type, then decide whether the item is testing product prediction, redox, electrochemistry, stoichiometry, rate, or equilibrium.
4Practice data and model interpretation because NT321 competencies repeatedly mention crosscutting concepts, science and engineering practices, graphs, evidence, and mathematical relationships.
5For energy questions, keep units visible and connect signs to meaning: heat absorbed versus released, entropy change, Gibbs spontaneity, and the direction of energy flow.

Frequently Asked Questions

What is the current ORELA Chemistry test code?

The current official ORELA Chemistry test code is NT321. ORELA's tests list shows Chemistry as NT321, and the NES update page says the older Chemistry test was offered only through August 31, 2025 before the updated Chemistry test replaced it.

How many questions are on ORELA Chemistry NT321?

The official ORELA Chemistry NT321 test page and profile list 100 multiple-choice questions.

How long is the ORELA Chemistry exam?

ORELA lists 2 hours and 30 minutes of testing time plus 15 minutes for the tutorial and nondisclosure agreement, for a 2-hour-and-45-minute total appointment.

What passing score do I need for ORELA Chemistry?

ORELA lists a passing score of 220 for Chemistry NT321.

How much does ORELA Chemistry cost?

The official ORELA Chemistry NT321 test page lists a test fee of $119. Candidates should still confirm the final checkout total when registering because fees can change.

What content is covered on ORELA Chemistry NT321?

The official profile weights the test as 50% Structure and Properties of Matter, 30% Chemical Reactions, and 20% Energy Changes.

Can ORELA Chemistry be taken online?

Yes. ORELA lists Chemistry as available by computer-based testing and by online proctoring. CBT appointments are available year round by appointment; online-proctored testing is offered during scheduled testing windows.

Does the current ORELA Chemistry profile include a separate science-instruction domain?

No separate instructional-methods domain is listed in the current NT321 profile. The profile repeatedly frames competencies through crosscutting concepts and science and engineering practices, so this question bank includes laboratory, data-analysis, modeling, and quantitative reasoning contexts within the chemistry domains.