Numas Study

• Grading scales by country: the exam simulation and the oral exam show your grade in the scale you pick under Settings → Exams — out of 30 (Italy), out of 20 (France, Portugal, Belgium), German stepped 1.0–5.0 scale, out of 10 (Spain, Netherlands), Swiss 1–6 scale, percentage with class (UK, Ireland), A–F letter grades (US, Canada) or a plain percentage. On first launch the scale follows your device region; nothing changes for students in Italy. • Exam format: besides the Italian university format (24 multiple-choice, 2 open questions, 76 minutes, quarter-point penalty) you can choose a short exam (15 multiple-choice, 30 minutes), a midterm (40 multiple-choice, 60 minutes) or a custom format with your own number of questions, open questions, duration and penalty. The start screen and the report show the numbers of the chosen format. • Oral exam: the virtual professor runs the exam and gives the final grade in the scale you set; the assessment is also recorded in a neutral form, so reports stay comparable if you change scale later. • Exam simulation reports you already saved keep the scale they were made with. • New Redox tool (Chemistry): oxidation numbers of a species from a formula with charge (KMnO4, Cr2O7^2-) or from a structure (CH3CH2OH, SMILES) with the rules step by step; reaction analysis — what is oxidised, what is reduced, oxidising and reducing agents, disproportionation — and step-by-step balancing: ion-electron method in acidic or basic medium, oxidation-number method for molecular equations. Every result is checked for atom and charge conservation. • Standard potentials: under the redox analysis you now see the two recognised half-couples with their E°, E°cell, ΔG° and the spontaneity verdict under standard conditions; plus a new tool, E° potentials, with the table of standard reduction potentials (100+ couples, searchable by formula or name, filterable by medium) where you pick cathode and anode to get E°cell, ΔG° and the overall reaction. • Organic redox: in the Redox reaction tab you can write organic structures (condensed formulas like CH3CH2OH, or SMILES) next to the inorganic species; balancing works as usual and a new “Atoms that change” section says which carbon is oxidised or reduced and by how many electrons, with the per-atom numbers of reactant and product.