Castilla y León PAU Chemistry case studies
Castilla y León PAU Chemistry · Put your knowledge to work in context.
The Química PAU of Castilla y León is the chemistry paper inside the university entrance assessment used by students in this autonomous community who want to enter a degree programme, and by candidates improving their access or admission mark. It is a written, free-response examination organised into two complete options, A and B; you choose one and answer all of its parts. Expect multi-step numerical problems and theory questions that demand explanation, correct units and sensible significant figures rather than a single final number. The syllabus spans atomic structure and periodicity, bonding and intermolecular forces, thermodynamics, kinetics and equilibrium, acid–base chemistry, solubility equilibria, redox and electrochemistry, and organic chemistry, with a practical-style question that tests laboratory reasoning. The Castilla y León PAU Chemistry case studies are 5 cases and about 2,709 words.
1Identifying a Period 3 Metal from Ionization Energy Data
During a practical session at a Castilla y León university, students receive a sealed vial labelled X. The label states only that X is a period-3 element.
580 words, about 3 min2Assigning Unlabelled Liquids from Boiling Points and Intermolecular Forces
A laboratory assistant finds four unlabelled bottles in a storeroom. The inventory lists four possible compounds: butane, propanone, propan-1-ol and propane-1,3-diol.
541 words, about 3 min3Methanol Synthesis: Thermodynamic Feasibility versus Industrial Conditions
An industrial team is evaluating a methanol synthesis loop: CO(g) + 2 H2(g) ⇌ CH3OH(g). The reactor can operate between 300 and 550 K and at 50–100 atm over a Cu/ZnO/Al2O3 catalyst.
520 words, about 3 min4Weak-Acid Titration: Extracting Ka and Choosing an Indicator
During a titration practical, 25.00 mL of a monoprotic weak acid HA of unknown concentration is placed in a conical flask and titrated with standardized 0.100 M NaOH from a burette. The equivalence point is reached at 25.00 mL of NaOH.
553 words, about 3 min5Identifying Organic Compounds from Formula, Tests and Boiling Point
A school laboratory has four unlabelled bottles, A–D, containing colourless organic liquids. Elemental analysis shows: A has molecular formula C4H10O; B has C4H8O; C and D both have C4H8O2.
515 words, about 3 min