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Free Practice Questions for Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB

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Key Facts: Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB Exam

90 min

Exam duration (1.5 hours)

UIB PAU Commission

0–10

Grading scale

PAU General Guidelines

4.0

Minimum Access Phase mark required

Spanish University Access Regulations

100

Practice questions in this OpenExamPrep bank

OpenExamPrep

Balearic Islands PAU Chemistry (UIB 2026) is a 90-minute exam evaluating 2º Bachillerato chemistry mastery across 7 major domain areas.

Sample Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB Practice Questions

Try these sample questions to review concepts for the Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which set of quantum numbers (n, l, ml, ms) is permissible for an electron in the 3p subshell of an atom in its ground state?
A.(3, 1, -1, +1/2)
B.(3, 2, 0, -1/2)
C.(3, 0, +1, +1/2)
D.(2, 1, -1, +1/2)
Explanation: For a 3p electron, the principal quantum number n = 3, and the azimuthal (orbital angular momentum) quantum number l = 1 (since l = 0 for s, 1 for p, 2 for d). The magnetic quantum number ml can take integer values from -l to +l, so for l = 1, ml ∈ {-1, 0, +1}. The spin quantum number ms can be +1/2 or -1/2. Therefore, (3, 1, -1, +1/2) is valid.
2What is the ground-state electron configuration of the chromium atom (Z = 24), accounting for subshell stability rules?
A.[Ar] 4s² 3d⁵
B.[Ar] 4s¹ 3d⁵
C.[Ar] 4s² 3d⁴
D.[Ar] 4s⁰ 3d⁶
Explanation: Chromium (Z = 24) is a well-known exception to the standard Aufbau ordering. To achieve extra stability associated with a half-filled 3d subshell (5 electrons), an electron is promoted from the 4s orbital to the 3d subshell. Thus, its ground-state configuration is [Ar] 4s¹ 3d⁵ rather than [Ar] 4s² 3d⁴.
3Which of the following elements has the highest first ionization energy?
A.Oxygen (O)
B.Nitrogen (N)
C.Neon (Ne)
D.Fluorine (F)
Explanation: First ionization energy increases across a period from left to right and decreases down a group. Neon (Ne, Z = 10) is a noble gas at the extreme right of Period 2 with a stable closed-shell octet (2s² 2p⁶), giving it the highest first ionization energy among the options (2080 kJ/mol).
4Arrange the following species in order of increasing ionic/atomic radius: Na⁺, Mg²⁺, F⁻, O²⁻.
A.O²⁻ < F⁻ < Na⁺ < Mg²⁺
B.Na⁺ < Mg²⁺ < F⁻ < O²⁻
C.Mg²⁺ < Na⁺ < O²⁻ < F⁻
D.Mg²⁺ < Na⁺ < F⁻ < O²⁻
Explanation: Mg²⁺, Na⁺, F⁻, and O²⁻ are isoelectronic species, all possessing 10 electrons ([Ne] configuration). In an isoelectronic series, radius decreases as nuclear charge (Z) increases. Nuclear charges are: Mg (Z=12), Na (Z=11), F (Z=9), O (Z=8). Thus, radius increases as Z decreases: Mg²⁺ (smallest) < Na⁺ < F⁻ < O²⁻ (largest).
5What is the maximum number of electrons in an atom that can share the quantum numbers n = 4 and ms = -1/2?
A.16
B.32
C.8
D.4
Explanation: For n = 4, the principal energy level contains subshells l = 0 (4s), l = 1 (4p), l = 2 (4d), and l = 3 (4f). Total number of orbitals in shell n = 4 is n² = 4² = 16 orbitals. Each orbital can hold at most 2 electrons: one with ms = +1/2 and one with ms = -1/2. Therefore, exactly 16 electrons in the n = 4 level have ms = -1/2.
6Why does Nitrogen (N) have a less exothermic electron affinity than Carbon (C), despite Nitrogen being further to the right in Period 2?
A.Nitrogen has a lower nuclear charge than Carbon, leading to weaker electrostatic attraction for incoming electrons.
B.Nitrogen has a stable half-filled 2p³ subshell, so adding an electron requires pairing in a 2p orbital, causing inter-electronic repulsion.
C.Nitrogen has a smaller atomic radius than Carbon, which prevents any electron from entering the valence shell.
D.Nitrogen is a gas while Carbon is a solid, altering the standard thermochemical state of the electron affinity reaction.
Explanation: Carbon has electron configuration 1s² 2s² 2p², so adding an electron yields a half-filled 2p³ subshell ([1s² 2s² 2p³]), which is energetically favorable. Nitrogen already has a stable half-filled 2p³ configuration; adding an electron forces it into an already occupied 2p orbital (2p⁴), incurring electron-electron pairing repulsion. Hence, N has an electron affinity close to zero (~0 kJ/mol), less exothermic than C (-122 kJ/mol).
7What is the de Broglie wavelength of an electron (mass m = 9.11 × 10⁻³¹ kg) moving at a velocity of 2.0 × 10⁶ m/s? (h = 6.626 × 10⁻³⁴ J·s)
A.7.28 × 10⁻¹⁰ m
B.5.45 × 10⁻⁹ m
C.3.64 × 10⁻¹⁰ m
D.1.82 × 10⁻¹⁰ m
Explanation: According to de Broglie's equation: λ = h / (m · v). Substituting values: λ = (6.626 × 10⁻³⁴ J·s) / [(9.11 × 10⁻³¹ kg) × (2.0 × 10⁶ m/s)] = (6.626 × 10⁻³⁴) / (1.822 × 10⁻²⁴) = 3.6366 × 10⁻¹⁰ m ≈ 3.64 × 10⁻¹⁰ m (0.364 nm).
8What is the ground-state electron configuration of the iron(III) ion, Fe³⁺ (Z = 26)?
A.[Ar] 4s² 3d³
B.[Ar] 4s¹ 3d⁴
C.[Ar] 3d⁶
D.[Ar] 3d⁵
Explanation: Neutral iron atom (Z = 26) has the configuration [Ar] 4s² 3d⁶. When transition metal cations are formed, electrons are removed first from the outermost valence shell, which is the 4s subshell. Removing 3 electrons means removing 2 electrons from 4s and 1 electron from 3d, leaving [Ar] 4s⁰ 3d⁵, simplified as [Ar] 3d⁵.
9Which periodic trend correctly describes electronegativity across Period 3 elements (Na to Cl)?
A.Increases from Na to Cl because effective nuclear charge increases and atomic radius decreases.
B.Decreases from Na to Cl because the shielding effect increases markedly across the period.
C.Remains constant because all elements in Period 3 have their valence electrons in the n = 3 shell.
D.Increases from Na to Si, then decreases from P to Cl due to p-orbital pairing.
Explanation: Electronegativity measures an atom's ability to attract shared bonding electrons. Across Period 3 (Na to Cl), nuclear charge increases from Z = 11 to Z = 17 while core shielding remains nearly constant (10 core electrons). Consequently, effective nuclear charge (Z_eff) increases and atomic radius contracts, drawing bonding electrons more strongly toward the nucleus. Thus, electronegativity increases from Na (0.93) to Cl (3.16).
10How many total spherical (radial) nodes and planar (angular) nodes does a 4p orbital possess?
A.0 radial nodes and 3 angular nodes
B.2 radial nodes and 1 angular node
C.1 radial node and 2 angular nodes
D.3 radial nodes and 0 angular nodes
Explanation: For any atomic orbital: Angular nodes = l. For a p orbital, l = 1, so it has 1 angular (planar) node. Radial nodes = n - l - 1. For a 4p orbital (n = 4, l = 1), radial nodes = 4 - 1 - 1 = 2. Total nodes = n - 1 = 3 (2 radial + 1 angular).

About the Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB Exam

The Balearic Islands PAU Chemistry examination (Química UIB) is the university entrance test for students completing 2º Bachillerato in the Balearic Islands (Mallorca, Menorca, Ibiza, Formentera). It assesses core competencies in atomic physics, chemical bonding, chemical thermodynamics, chemical equilibrium, acid-base systems, electrochemistry, and organic reactions.

Exam sponsor: PAU Organising Commission of the Balearic Islands / UIB. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The PAU Chemistry examination administered by UIB consists of written chemical problems and theoretical questions lasting 90 minutes. Students answer mandatory and elective options covering the 2º Bachillerato Chemistry curriculum. Local practice items are an English-language MCQ study adaptation of the official open/semi-constructed Balearic Islands PAU paper, not an official translation or format simulation.

Time Limit

90 minutes (1.5 hours)

Passing Score

Marked on a 0–10 scale. Minimum 4.0 required in Access Phase to combine with Bachillerato GPA (60% Bachillerato + 40% PAU >= 5.0 to pass).

Exam / Certification Fees

EUR 69.21 ordinary registration fee (Access Phase); EUR 13.85 per additional Admission Phase subject paper (UIB 2026)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

14%

Atomic Structure & Periodic Table

Quantum numbers, electronic configurations, Aufbau principle, periodic trends (ionization energy, electron affinity, atomic radius, electronegativity).

14%

Chemical Bonding & Molecular Structure

Ionic, covalent, and metallic bonding, Lewis structures, formal charge, VSEPR molecular geometry, hybridization, and intermolecular forces.

14%

Thermochemistry & Chemical Energetics

Enthalpy of reaction, Hess's Law, bond enthalpies, standard enthalpy of formation, entropy, and Gibbs free energy spontaneity.

15%

Chemical Equilibrium & Kinetics

Reaction rates, rate laws, activation energy, equilibrium constants (Kc, Kp), Le Chatelier's principle, and degree of dissociation.

15%

Acid-Base & Solubility Equilibria

pH and pOH calculations, Arrhenius and Brønsted-Lowry theories, weak acid/base dissociation, buffer solutions, salt hydrolysis, and solubility product (Ksp).

14%

Oxidation-Reduction & Electrochemistry

Oxidation numbers, balancing redox equations by ion-electron method, galvanic cells, Nernst equation, and Faraday's laws of electrolysis.

14%

Organic Chemistry

IUPAC nomenclature, functional groups, structural and stereoisomerism, organic reaction mechanisms (addition, substitution, elimination, esterification).

Preparing for the Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB Exam

What You Need to Know

  • Passing score: Marked on a 0–10 scale. Minimum 4.0 required in Access Phase to combine with Bachillerato GPA (60% Bachillerato + 40% PAU >= 5.0 to pass).
  • Assessment: The PAU Chemistry examination administered by UIB consists of written chemical problems and theoretical questions lasting 90 minutes. Students answer mandatory and elective options covering the 2º Bachillerato Chemistry curriculum. Local practice items are an English-language MCQ study adaptation of the official open/semi-constructed Balearic Islands PAU paper, not an official translation or format simulation.
  • Time limit: 90 minutes (1.5 hours)
  • Exam / certification fees: EUR 69.21 ordinary registration fee (Access Phase); EUR 13.85 per additional Admission Phase subject paper (UIB 2026) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Balearic Islands PAU Chemistry / Química 2º Bachillerato UIB: Suggested Study Strategy

1Master Hess's law calculations and standard enthalpy of formation problems.
2Practice equilibrium constant derivations (Kc and Kp) and Le Chatelier principle predictions.
3Be fluent in Henderson-Hasselbalch buffer calculations and Ksp solubility product determinations.
4Practice balancing complex redox equations using the ion-electron method in acidic and basic media.
5Memorize organic reaction mechanisms including Markovnikov addition, Zaitsev elimination, and Fischer esterification.

Frequently Asked Questions

Are these official Balearic Islands PAU exam questions?

Local practice items are an English-language MCQ study adaptation of the official open/semi-constructed Balearic Islands PAU paper, not an official translation or format simulation. Use official UIB past papers and subject matrices for open-response, listening, graphic, and performance practice.

What is the Balearic Islands PAU Chemistry exam?

It is the official university entrance paper in Chemistry (Química) organized by the Universitat de les Illes Balears (UIB) for high school graduates in the Balearic Islands.

What is the duration and format of the exam?

The examination lasts 90 minutes (1.5 hours) and includes problem-solving exercises, numerical chemical calculations, and theoretical concept explanations.

What passing score is required for university admission?

The paper is scored from 0 to 10 points. A minimum score of 4.0 in the Access Phase is required to combine with the Bachillerato GPA (weighted 60% Bachillerato + 40% PAU, requiring a total of >= 5.0 to pass).

What languages are available for the exam paper?

The exam is officially provided in Catalan (ca) and Spanish (es).

What topics are covered on the UIB Chemistry paper?

The curriculum includes atomic structure, chemical bonding, thermochemistry, chemical kinetics and equilibrium, acid-base and solubility equilibria, redox/electrochemistry, and organic chemistry.