Valencian Community PAU Chemistry case studies
Valencian Community PAU Chemistry · Put your knowledge to work in context.
This independent study page provides practice for Valencian Community PAU Chemistry. Its editorial learning areas include Structure, bonding and inorganic chemistry; Physical chemistry, amounts and reactions; Organic chemistry and macromolecules; Experimental reasoning and analytical data. The questions develop subject knowledge and application through worked reasoning, distinctions between competing answers, and practical scenarios. Study the relevant guide before attempting a mixed set, then explain the evidence or calculation that supports each answer. Topics on this exam: Structure, bonding and inorganic chemistry, Physical chemistry, amounts and reactions, Organic chemistry and macromolecules, and Experimental reasoning and analytical data. The Valencian Community PAU Chemistry case studies are 4 cases and about 2,260 words.
1Identifying Two Unlabelled Metals from Ionisation Energies
Theoretical classroom model only. Use the supplied constants and idealizations; this is not authorization to handle unknown samples, run a combustion experiment or alter an operating chemical plant. A quality-control laboratory receives two unlabelled metal samples, X and Y, from a recycling stream. Because no wet-chemistry bench is available on site, an analyst records the first four ionisation energies (kJ mol−1) by a spectroscopic method.
637 words, about 3 min2Calorimetry of Ethanol Combustion: Incomplete or Just Lossy?
Theoretical classroom model only. Use the supplied constants and idealizations; this is not authorization to handle unknown samples, run a combustion experiment or alter an operating chemical plant. A student determines the enthalpy of combustion of ethanol using a spirit burner under a copper can containing 150.0 g of water. The burner loses 2.50 g of ethanol.
544 words, about 3 min3Preparing and Testing a Phosphate Buffer at pH 7.40
Theoretical classroom model only. Use the supplied constants and idealizations; this is not authorization to handle unknown samples, run a combustion experiment or alter an operating chemical plant. A teaching laboratory needs 1.00 L of a 0.100 M phosphate buffer at pH 7.40 for an enzyme assay. The stock cupboard contains anhydrous sodium dihydrogen phosphate (NaH2PO4, M = 119.98 g mol−1), anhydrous disodium hydrogen phosphate (Na2HPO4, M = 141.96 g mol−1), 1.00 M HCl and 1.00 M NaOH.
516 words, about 3 min4Silver Electroplating: Efficiency, Side Reactions and Current Increase
Theoretical classroom model only. Use the supplied constants and idealizations; this is not authorization to handle unknown samples, run a combustion experiment or alter an operating chemical plant. A workshop electroplates steel fittings with silver from a nitrate bath. The fitting is the cathode and a pure silver anode is used.
563 words, about 3 min