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Key Facts: Canary Islands PAU Chemistry Exam

90 Minutes

Exam duration

COPAU Canarias

EUR 76.12

Base PAU registration fee

Gobierno de Canarias 2026

0–10 Scale

Grading scale (Min 4.0 required)

COPAU Regulations

7 Core Blocks

Curriculum blocks covered

LOMLOE 2º Bachillerato

100 Questions

Practice bank size in OpenExamPrep

OpenExamPrep

Canary Islands PAU Chemistry (COPAU 2026) is a 90-minute university entrance exam assessing 2º Bachillerato Chemistry across 7 core curriculum blocks.

Sample Canary Islands PAU Chemistry Practice Questions

Try these sample questions to review concepts for the Canary Islands PAU Chemistry 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 valid for an electron located in a 3p atomic orbital?
A.(3, 1, 0, +1/2)
B.(3, 2, -1, +1/2)
C.(3, 0, +1, -1/2)
D.(2, 1, 0, +1/2)
Explanation: For a 3p orbital, the principal quantum number is n = 3 and the azimuthal (angular momentum) quantum number is l = 1. The magnetic quantum number ml can take integer values from -l to +l (i.e., -1, 0, +1), and the spin quantum number ms can be +1/2 or -1/2. Thus, (3, 1, 0, +1/2) represents a completely valid set.
2What is the ground-state electron configuration of a neutral chromium atom (Cr, Z = 24)?
A.[Ar] 4s⁰ 3d⁶
B.[Ar] 4s² 3d⁴
C.[Ar] 4s¹ 3d⁵
D.[Ar] 4s² 3d⁵
Explanation: Chromium exhibits an anomalous electron configuration due to the extra stability associated with a half-filled 3d subshell. Transferring one electron from the 4s orbital to the 3d subshell produces [Ar] 4s¹ 3d⁵, which minimizes electron-electron repulsion and maximizes exchange energy.
3Which of the following Period 3 elements possesses the highest first ionization energy (I₁)?
A.Magnesium (Mg)
B.Aluminium (Al)
C.Chlorine (Cl)
D.Sodium (Na)
Explanation: First ionization energy generally increases across a period from left to right as nuclear charge (Z) increases while valence electrons are added to the same principal energy level (n = 3), resulting in a higher effective nuclear charge (Zeff). Chlorine, located at the far right of Period 3 among the options given, holds its 3p electrons most tightly.
4Among the isoelectronic species Na⁺, Ne, F⁻, and O²⁻, which species has the largest ionic/atomic radius?
A.O²⁻
B.F⁻
C.Ne
D.Na⁺
Explanation: All four species are isoelectronic, possessing 10 electrons with the configuration 1s² 2s² 2p⁶. The radius of isoelectronic species decreases as nuclear charge (Z) increases. O²⁻ has the smallest atomic number (Z = 8), meaning its 8 protons exert the weakest electrostatic attraction on the 10 electrons, giving it the largest ionic radius.
5A violet laser emits electromagnetic radiation with a wavelength λ = 400 nm. What is the energy of a single photon emitted by this laser? (h = 6.626 × 10⁻³⁴ J·s, c = 3.00 × 10⁸ m/s)
A.2.65 × 10⁻¹⁹ J
B.1.99 × 10⁻²⁵ J
C.4.97 × 10⁻¹⁹ J
D.8.28 × 10⁻¹⁹ J
Explanation: Using Planck's equation E = h·ν = h·c / λ, convert λ = 400 nm = 400 × 10⁻⁹ m. Substituting the constants gives E = (6.626 × 10⁻³⁴ J·s × 3.00 × 10⁸ m/s) / (400 × 10⁻⁹ m) = (1.9878 × 10⁻²⁵) / (4.00 × 10⁻⁷) = 4.97 × 10⁻¹⁹ J.
6What is the de Broglie wavelength of an electron (mass m = 9.11 × 10⁻³¹ kg) moving at a velocity of 2.00 × 10⁶ m/s? (h = 6.626 × 10⁻³⁴ J·s)
A.1.46 nm
B.3.64 nm
C.0.364 nm
D.0.091 nm
Explanation: According to de Broglie's equation λ = h / (m·v), substitute the electron's mass and velocity: λ = (6.626 × 10⁻³⁴ J·s) / (9.11 × 10⁻³¹ kg × 2.00 × 10⁶ m/s) = 6.626 × 10⁻³⁴ / (1.822 × 10⁻²⁴) = 3.637 × 10⁻¹⁰ m = 0.364 nm.
7An unknown main-group element X displays the following successive ionization energies: I₁ = 738 kJ/mol, I₂ = 1451 kJ/mol, I₃ = 7733 kJ/mol, I₄ = 10540 kJ/mol. To which group of the periodic table does element X belong?
A.Group 1 (Alkali metals)
B.Group 2 (Alkaline earth metals)
C.Group 14 (Carbon group)
D.Group 13 (Boron group)
Explanation: A massive jump occurs between I₂ (1451 kJ/mol) and I₃ (7733 kJ/mol), exceeding a 5-fold increase. This huge energy jump signifies that removing the third electron requires breaking into a highly stable core noble-gas electron shell. Therefore, element X possesses exactly 2 valence electrons and belongs to Group 2 (alkaline earth metals, e.g., Mg).
8Why does fluorine (F) have a slightly less exothermic first electron affinity (EA₁ = -328 kJ/mol) than chlorine (Cl, EA₁ = -349 kJ/mol), despite fluorine having a higher electronegativity?
A.Fluorine's effective nuclear charge (Zeff) is lower than that of chlorine
B.Fluorine has a larger atomic radius than chlorine, reducing nuclear attraction for incoming electrons
C.The small volume of fluorine's 2p subshell creates significant electron-electron repulsion that opposes adding an electron
D.Fluorine cannot expand its octet to accommodate extra electrons, whereas chlorine can
Explanation: Fluorine's 2p orbital is extremely compact in volume. When an incoming electron is added to form F⁻, it experiences unusually strong inter-electronic repulsion from the seven existing valence electrons crowded in the small n=2 shell. This repulsive force partially offsets the strong nuclear attraction, making F's electron affinity slightly less exothermic than Cl's (3p orbital is larger and less crowded).
9How many unpaired electrons are present in the ground state of a gaseous iron(III) ion (Fe³⁺, Z = 26)?
A.3
B.1
C.4
D.5
Explanation: Neutral iron (Z = 26) has the configuration [Ar] 4s² 3d⁶. Ionization removes electrons first from the outermost principal quantum shell (4s), so forming Fe³⁺ involves losing two 4s electrons and one 3d electron, giving [Ar] 3d⁵. According to Hund's rule of maximum multiplicity, all five 3d electrons occupy separate d orbitals with parallel spins, resulting in 5 unpaired electrons.
10When a hydrogen atom emits a photon during an electronic transition, the radiation frequency is ν = 6.17 × 10¹⁴ Hz. What is the wavelength of this emission line? (c = 3.00 × 10⁸ m/s)
A.656 nm
B.434 nm
C.410 nm
D.486 nm
Explanation: Wavelength λ and frequency ν are related by λ = c / ν. Substituting the speed of light and frequency gives λ = (3.00 × 10⁸ m/s) / (6.17 × 10¹⁴ s⁻¹) = 4.862 × 10⁻⁷ m = 486 nm. This corresponds to the blue-green H-beta Balmer spectral line of hydrogen (n=4 → n=2).

About the Canary Islands PAU Chemistry Exam

The Canary Islands PAU Chemistry examination (Procesos de Evaluación de Bachillerato para el Acceso a la Universidad, COPAU 2026) is the official standardized assessment for 2º Bachillerato chemistry students in the Canary Islands (ULPGC and ULL). This practice bank offers 100 rigorous multiple-choice questions with step-by-step calculations and detailed feedback covering atomic structure, bonding, thermochemistry, chemical equilibrium, acid-base chemistry, electrochemistry, and organic reactions.

Exam sponsor: Canary Islands PAU Organising Commission (COPAU) / ULPGC & ULL. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Official 90-minute written examination evaluating 2º Bachillerato Chemistry topics: Atomic Structure & Periodic Properties, Chemical Bonding & Intermolecular Forces, Thermodynamics & Thermochemistry, Chemical Equilibrium & Le Chatelier, Acid-Base Equilibria & pH, Redox & Electrochemistry, and Organic Chemistry.

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 76.12 base registration fee for PAU Access Phase (set by Gobierno de Canarias / COPAU).

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 Properties

Quantum numbers, ground-state electron configurations, periodic trends (atomic radii, ionization energies, electron affinity), electromagnetic radiation, and de Broglie wavelength.

14%

Chemical Bonding & Intermolecular Forces

Ionic lattice energy and Born-Haber cycle, Lewis structures, formal charges, VSEPR molecular geometry, orbital hybridization, hydrogen bonding, and intermolecular interactions.

14%

Thermodynamics & Thermochemistry

Standard enthalpy of reaction and formation, Hess's Law, bond enthalpies, standard entropy change, Gibbs free energy, and temperature-dependent reaction spontaneity.

14%

Chemical Equilibrium & Le Chatelier

Homogeneous and heterogeneous equilibrium constants (Kc, Kp), reaction quotient, Le Chatelier's principle, degree of dissociation, solubility product (Ksp), and common ion effect.

15%

Acid-Base Equilibrium & pH Calculations

Brønsted-Lowry and Lewis acid-base theories, pH and pOH calculations for strong and weak acids/bases, salt hydrolysis, buffer solutions (Henderson-Hasselbalch), and volumetric titrations.

15%

Redox Reactions & Electrochemistry

Oxidation numbers, balancing redox half-reactions in acid/base media, galvanic cell potential (E°cell), standard reduction potentials, Nernst equation, and Faraday's laws of electrolysis.

14%

Organic Chemistry

IUPAC nomenclature of functional groups, structural and optical isomerism (chirality, E/Z stereoisomerism), Markovnikov addition, Zaitsev elimination, esterification, oxidation, and polymerization.

Preparing for the Canary Islands PAU Chemistry 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: Official 90-minute written examination evaluating 2º Bachillerato Chemistry topics: Atomic Structure & Periodic Properties, Chemical Bonding & Intermolecular Forces, Thermodynamics & Thermochemistry, Chemical Equilibrium & Le Chatelier, Acid-Base Equilibria & pH, Redox & Electrochemistry, and Organic Chemistry.
  • Time limit: 90 minutes (1.5 hours)
  • Exam / certification fees: EUR 76.12 base registration fee for PAU Access Phase (set by Gobierno de Canarias / COPAU). 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

Canary Islands PAU Chemistry: Suggested Study Strategy

1Practice multi-step stoichiometric and thermodynamic calculations, ensuring proper sign conventions for Delta H and Delta G.
2Master VSEPR geometry and hybridization assignments for central atoms with lone pairs.
3Memorize key acid-base formulas including weak acid dissociation and Henderson-Hasselbalch buffer calculations.
4Review ion-electron half-reaction balancing for dichromate and permanganate redox titrations.

Frequently Asked Questions

Is this practice bank in the same format as the real Canary Islands PAU exam?

No, and it is important to know the difference. The official Canary Islands PAU paper is a 90-minute examination sat in Spanish and built around structured written problems, data interpretation, and justified extended answers. Under the 2026 PAU design rules agreed by COPAU and the CRUE, open and semi-constructed responses must account for at least 70% of every paper, so the real exam contains no multiple-choice section. This bank is an English-language multiple-choice study adaptation of the same official 2º Bachillerato syllabus — not an official translation, not a past paper, and not a simulation of the exam format. Use it to drill the underlying knowledge and reasoning quickly, then practise writing balanced equations, full stoichiometric working and justified explanations separately, because that is what the examiners actually mark.

What is the fee for the PAU Chemistry exam in the Canary Islands?

The base registration fee for the PAU Access Phase in the Canary Islands is EUR 76.12 as set by the Gobierno de Canarias / COPAU.

What passing score is required on the PAU Chemistry paper?

The exam is graded on a 0–10 scale. A minimum mark of 4.0 in the Access Phase is required to combine with the Bachillerato GPA (60% Bachillerato + 40% PAU >= 5.0).

How long is the Canary Islands PAU Chemistry examination?

The examination duration is 90 minutes (1.5 hours).

Which universities administer the PAU in the Canary Islands?

The exam is organized under COPAU jointly by the Universidad de Las Palmas de Gran Canaria (ULPGC) and the Universidad de La Laguna (ULL).