Državna Matura Chemistry case studies
Državna Matura Chemistry · Put your knowledge to work in context.
Kemija (Chemistry) is one of the elective subjects of the Državna matura, the state matura examination that Croatian candidates take at the end of secondary education. A passing grade in Chemistry can serve as a subject requirement for admission to university programmes in chemistry, chemical engineering, pharmacy, medicine, food technology, biotechnology and related fields, and many faculties count it toward admission points. The exam is written externally and is designed for gymnasium graduates and other candidates who have followed the chemistry curriculum, so it rewards solid coverage of the whole syllabus rather than narrow drilling. The assessed content spans the structure of matter and bonding, reaction stoichiometry and energetics, inorganic chemistry and the periodic system, organic chemistry and biochemistry, equilibrium, acids and bases, electrochemistry, and laboratory work with data analysis and calculation. The Državna Matura Chemistry case studies are 5 cases and about 2,241 words.
1Tri nepoznate krute tvari i vrste kemijskih veza
U školskom laboratoriju tri su uzorka označena A, B i C. Podaci su: A je bijela kristalna tvar, tali se pri 801 °C, u čvrstom stanju ne provodi struju, a rastaljena provodi; dobro se otapa u vodi, a otopina provodi struju.
476 words, about 2 min2Kalorimetrija i formula nepoznatog ugljikovodika
U kalorimetru pri stalnom tlaku spaljeno je 0,580 g nepoznatog zasićenog ugljikovodika u struji kisika. Pri tome je nastalo 1,760 g CO2 i 0,900 g H2O.
445 words, about 2 min3Dva izomera molekulske formule C3H6O2
Na polici su dvije bočice bez oznaka, A i B. Obje sadrže bezbojnu tekućinu molekulske formule C3H6O2.
399 words, about 2 min4Titracija nepoznate monoprotonske kiseline
Uzorak od 25,00 cm³ otopine nepoznate monoprotonske kiseline HA titrira se otopinom NaOH koncentracije 0,1000 mol dm⁻³. Do promjene boje fenolftaleina utrošeno je 20,40 cm³ lužine.
442 words, about 2 min5Standardizacija otopine NaOH koja je stajala otvorena
Pripremljeno je 250,0 cm³ otopine NaOH tako da je odvagano 1,000 g peleta NaOH s deklariranom čistoćom 97,0 % (ostatak je NaCl) i otopljeno u vodi do oznake. Bočica je tjedan dana bila otvorena, pa je dio NaOH reagirao s CO2 iz zraka.
479 words, about 2 min