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Electrolysis has long been a well-known and relatively widespread process in education at primary and secondary schools, which is used mainly as a demonstration experiment in front of students. We most often encounter simpler applications (for example, electrolysis of water or sodium or copper (II) chloride solution). This paper is focused on the lesser-known electrolysis of aqueous solutions of metal salts, which precipitate in a crystalline form in the form of micro trees (dendrites) when an electric current passes through it. For example, dendrites of tin, lead, silver, or copper, which differ in shape, can be prepared in this way. Dendrites are stable and can be easily isolated from a solution. The purpose of the paper is to bring electrolysis closer to high school students, which is effective and very interesting for them, but at the same time financially inexpensive and saves time, because these crystallizations take place in minutes and students can directly observe the nascent product. The paper also evaluates selected conditions (the influence of the substances used and their concentration in a solution, size of applied voltage, electrode material), which can have a fundamental influence on the rate of crystal formation or their shape and size. The theoretical background of electrolysis is mentioned only marginally in the paper, because it is quite extensive, complex, and not crucial for the given matter. [ABSTRACT FROM AUTHOR]

Computer simulations are a good example of the use of ICT in teaching science subjects. They allow students to have a more detailed view of the principle of the real system under study and thus offer new possibilities to support teaching. However, with the increasing availability of online simulations, the problem of selecting them for a specific teaching situation arises. This paper focuses on the mapping of criteria for the evaluation of computer simulations, using the example of electrolysis and galvanic cell as important representatives of the electrochemistry curriculum. The evaluation criteria were selected based on the analysis of several research studies conducted in the field of the application of simulations to chemistry teaching. These criteria were then used to evaluate the cocreated online available simulations of electrolysis and galvanic cell. From the results of the fulfillment of the selected criteria, computer simulations for teaching electrochemistry in high school are recommended. [ABSTRACT FROM AUTHOR]