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Razumevanje izbranih kemijskih pojmov na submikroskopski ravni pri učencih devetega razreda osnovne šole
Tompa, Valerija (Author), Glažar, Saša A. (Mentor) More about this mentor... This link opens in a new window, Slapničar, Miha (Co-mentor)

URLURL - Presentation file, Visit http://pefprints.pef.uni-lj.si/3824/ This link opens in a new window

Abstract
V diplomskem delu so predstavljene tri ravni kemijskega pojma; Johnstonov trikotnik treh ravni kemijskega pojma; model soodvisnosti treh ravni naravoslovnih pojmov; model poučevanja in učenja kemije; vizualizacijska sredstva; Paiviov model dvojne kodne teorije; rezultati raziskav, povezanih z razumevanjem izbranih kemijskih pojmov (element, spojina, čista snov, zmes, agregatno stanje snovi, fizikalna sprememba in kemijska reakcija); submikroskopskih predstavitev in simbolnih zapisov enačb kemijskih reakcij ter način poučevanja vseh izbranih kemijskih pojmov, razen čistih snovi na submikroskopski ravni. Glavni namen diplomskega dela je ugotoviti, ali se med učenci devetega razreda osnovne šole pojavljajo težave pri razumevanju izbranih kemijskih pojmov na submikroskopski ravni, prehodov med agregatnimi stanji snovi na makroskopski ravni oziroma kemijske reakcije na simbolni ravni. Rezultati raziskave so pokazali, da imajo učenci devetega razreda največ težav pri prepoznavanju vseh shem, ki ponazarjajo porazdelitev delcev v plinu in pri oblikovanju ustreznega simbolnega zapisa za enačbo kemijske reakcije na osnovi submikroskopske predstavitve. Tudi ugotovitve drugih raziskav kažejo, da imajo učenci težave pri razumevanju simbolnih zapisov. Približno dve tretjini učencev ni razlikovalo med submikroskopskima predstavitvama vode v tekočem in trdnem agregatnem stanju, oziroma ni prepoznalo zmesi elementov, zmesi dveh plinov/zmesi elementa in spojine iz shem porazdelitve delcev. Več kot polovica učencev ni prepoznala prehodov med agregatnimi stanji snovi (vode) na makroskopski ravni (taljenje in izparevanje) ter produkta (plin) in reaktantov kemijske reakcije (2 elementa) iz delčne predstavitve. Manj kot polovica učencev je imela težave pri prepoznavanju fizikalne spremembe in njenih lastnosti; tekočega agregatnega stanja snovi; spojine in zmesi plinov iz submikroskopskih predstavitev ter pri razlikovanju med kemijskima pojmoma element in spojina. Devetošolci so bili zelo uspešni pri določanju submikroskopske predstavitve, ki prikazuje element v trdnem agregatnem stanju; pri prepoznavanju procesa strjevanja snovi na makroskopski ravni ter zmesi in čistih snovi na delčni ravni. Učenci so bili uspešni tudi pri prepoznavanju procesa kondenzacije na makroskopski ravni in sublimacije na submikroskopski ravni. Ugotovitve raziskave so torej pokazale, da imajo učenci težave pri razumevanju nekaterih izbranih kemijskih pojmov na submikroskopski ravni ter prehodov med agregatnimi stanji vode na makroskopski ravni in kemijske reakcije na simbolni ravni.

Language:Slovenian
Keywords:razumevanje izbranih kemijskih pojmov
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:PEF - Faculty of Education
Year:2016
COBISS.SI-ID:11197769 Link is opened in a new window
Views:606
Downloads:143
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Secondary language

Language:English
Title:Understanding of selected chemical concepts on a submicroscopic level among ninth grade primary school students
Abstract:
This diploma thesis discusses the three levels of chemical concept; the Johnstone's triangle of three learning levels of chemistry; the interdependence of the three levels of science concepts model; the teaching and learning chemistry model; the visualization tools; the Paivio’s dual coding model; the results of the researches based on understanding of selected chemical concepts (element, compound, pure substance, mixture, state of matter, physical change and chemical reaction), submicroscopic representations, chemical equations and the methods of teaching of all the selected chemical concepts except pure substances on a submicroscopic level. The main purpose of the diploma thesis is to find out whether there are any problems with ninth grade primary school students’ understanding of the selected chemical concepts on a submicroscopic level, the changing states of matter on a macroscopic level and the chemical reaction on a symbolic level. The results of the research have shown that the students in ninth grade have the most problems with decoding diagrams representing the arrangement of particles in a gaseous state and with forming the correct chemical equation on the basis of a submicroscopic representation. Other researches also showed that students have problems with understanding of symbolic forms. Approximately two-thirds of the students did not differentiate between the submicroscopic representations of water in liquid and solid state or did not identify a mixture of elements, a mixture of two gases/a mixture of an element and a compound from diagrams of particle arrangements. More than a half of the students could not identify the changing states of matter (water) on a macroscopic level (melting and evaporation) or did not recognize the product (gas) and the reactants in a chemical reaction (2 elements) based on particulate representation. Less than a half of the students had difficulties with recognizing the physical change and its properties; the liquid state of matter; the compound; the mixture of gases from submicroscopic representations and with differentiating between the chemical concepts element and compound. Ninth grade students were very successful at defining submicroscopic representation of an element in a solid state; at identifying the process of freezing on a macroscopic level and at recognising a mixture and a pure substance on a particle level. They were also successful in identifying the process of condensation on macroscopic level and sublimation on submicroscopic level. The research shows that the students have difficulties with understanding some of the selected chemical concepts on a submicroscopic level as well as the changing states of matter of water on a macroscopic level and a chemical reaction on a symbolic level.

Keywords:understanding of selected chemical concepts

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