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Madrid PAU General Sciences Examination — UCM (Ciencias Generales 2º Bachillerato 2026) practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: Madrid PAU General Sciences Exam
90 min
Official exam duration for Madrid PAU General Sciences
Comisión Organizadora de la PAU de Madrid (UCM)
0–10
Grading scale (minimum 4.0 in Access Phase to combine with GPA)
BOCM / Universidad Complutense de Madrid
EUR 93.02
Base registration fee for mandatory PAU Access Phase in Madrid
Comunidad de Madrid
5 Core Blocks
Curriculum units evaluated in 2º Bachillerato Ciencias Generales
LOMLOE 2º Bachillerato Curriculum
100
Practice questions provided in this OpenExamPrep evaluation bank
OpenExamPrep
Madrid PAU General Sciences (UCM 2026) is a 90-minute university entrance exam assessing 2º Bachillerato Ciencias Generales across 5 core subject areas.
Sample Madrid PAU General Sciences Practice Questions
Try these sample questions to test your Madrid PAU General Sciences exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1A neutral atom of the chlorine-35 isotope (atomic number Z = 17, mass number A = 35) contains which composition of subatomic particles?
A.17 protons, 18 neutrons, and 17 electrons
B.17 protons, 35 neutrons, and 17 electrons
C.18 protons, 17 neutrons, and 18 electrons
D.35 protons, 17 neutrons, and 35 electrons
Explanation: The atomic number Z = 17 defines the number of protons in the nucleus, which equals 17. In a neutral atom, the number of electrons equals the number of protons (17). The number of neutrons is calculated as the mass number minus the atomic number: A - Z = 35 - 17 = 18 neutrons.
2Which statement correctly describes the general periodic trend of electronegativity across the periodic table?
A.Electronegativity decreases from left to right across a period and increases down a group.
B.Electronegativity increases from left to right across a period and decreases down a group.
C.Electronegativity remains constant across a period and decreases down a group.
D.Electronegativity increases down a group and remains constant across a period.
Explanation: Electronegativity measures an atom's tendency to attract shared electrons in a chemical bond. It increases moving from left to right across a period due to increasing effective nuclear charge, and decreases moving down a group because inner electron shells shield the outer valence electrons.
3Which characteristic property is typical of metallic substances as explained by the electron sea model?
A.High brittleness and poor electrical conductivity in the solid state
B.Low boiling points and discrete molecular structures
C.High electrical and thermal conductivity due to delocalized valence electrons
D.Ability to form directional covalent bonds in a rigid lattice
Explanation: According to the metallic bonding model, positive metal cations are surrounded by a mobile 'sea' of delocalized valence electrons. These freely moving electrons allow metals to conduct heat and electricity efficiently in the solid state.
4What are the stoichiometric coefficients required to balance the complete combustion reaction of propane: C3H8 + x O2 -> y CO2 + z H2O?
A.x = 3, y = 3, z = 4
B.x = 4, y = 3, z = 4
C.x = 5, y = 4, z = 3
D.x = 5, y = 3, z = 4
Explanation: Balancing C3H8 + 5 O2 -> 3 CO2 + 4 H2O: 3 carbons yield 3 CO2, 8 hydrogens yield 4 H2O. The right side contains 3*2 + 4*1 = 10 oxygen atoms, requiring 5 O2 molecules. Thus x = 5, y = 3, z = 4.
5Which phase change process describes the direct transition of a substance from the solid state into the gaseous state without passing through a liquid phase?
A.Sublimation
B.Deposition
C.Vaporization
D.Condensation
Explanation: Sublimation is the endothermic phase change in which a solid transforms directly into a gas without entering the liquid state (e.g., solid carbon dioxide or iodine). Deposition is the reverse process.
6What is the pH of a 0.01 M aqueous solution of hydrochloric acid (HCl), assuming complete dissociation?
A.1.0
B.2.0
C.3.0
D.12.0
Explanation: Hydrochloric acid is a strong acid that completely dissociates: [H+] = 0.01 M = 10^-2 M. Calculating pH = -log10[H+] gives -log10(10^-2) = 2.0.
7In a liquid solution, how is a 'saturated solution' defined at a given temperature and pressure?
A.A solution that contains less solute than the maximum dissolved amount possible at equilibrium
B.A solution in which no solvent remains in the liquid state
C.A solution containing the maximum concentration of dissolved solute in equilibrium with undissolved solute
D.A solution prepared by mixing equal volumes of two completely immiscible liquids
Explanation: A saturated solution contains the maximum possible concentration of dissolved solute at a specified temperature and pressure, establishing a dynamic equilibrium between dissolved and undissolved solute particles.
8What is the oxidation state of sulfur (S) in sulfuric acid, H2SO4?
A.+2
B.+4
C.-2
D.+6
Explanation: In H2SO4, hydrogen has an oxidation number of +1 (total +2) and oxygen has -2 (total -8). For the neutral compound to have a net charge of 0: (+2) + S + (-8) = 0, which yields S = +6.
9Using the ideal gas law (PV = nRT), calculate the volume occupied by 0.50 moles of nitrogen gas (N2) at a pressure of 1.0 atm and a temperature of 300 K. (R = 0.0821 L*atm/(mol*K)).
A.12.3 L
B.24.6 L
C.6.15 L
D.11.2 L
Explanation: Applying PV = nRT: V = (n * R * T) / P = (0.50 mol * 0.0821 L*atm/(mol*K) * 300 K) / 1.0 atm = 12.315 L, which rounds to 12.3 L.
10What mass of sodium chloride (NaCl, molar mass = 58.5 g/mol) is required to prepare 250 mL of a 0.50 M aqueous solution?
A.14.6 g
B.7.31 g
C.29.3 g
D.3.65 g
Explanation: Moles of NaCl needed = Molarity * Volume in liters = 0.50 mol/L * 0.250 L = 0.125 moles. Mass = moles * molar mass = 0.125 mol * 58.5 g/mol = 7.3125 g, which rounds to 7.31 g.
About the Madrid PAU General Sciences Practice Questions
Verified exam format metadata for Madrid PAU General Sciences Examination — UCM (Ciencias Generales 2º Bachillerato 2026) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.