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This competence-based textbook continues and develops the author's concept of well-known textbooks that have been enjoying the well-deserved trust and respect of the educational community of Ukraine for many years.

The main goal of this textbook is to learn the world of substances and chemical phenomena in an accessible and interesting way, especially those that students will deal with in everyday life and that require safe handling.

The content of each paragraph is designed so that, working with it, students are satisfied with the results of their own educational work, form key and subject competences.

To motivate everyone to study chemistry, at the beginning of the paragraph, the competences provided by the curriculum are given, the formation or development of which will take place in the process of learning activities to work out the content of the paragraph.

The textbook clearly, logically and accessible explains the new material, and provides enough examples of the practical application of chemical knowledge. This makes the textbook accessible to students with different levels of academic achievement. For a deeper understanding of chemistry, additional information in the section "Erudite's Page", practice-oriented tasks in the section "Chemistry is Life: Naturalist's Page", and a special "Media Page" will be useful.

The experience of creative activity is acquired during the experiments described in the textbook, as well as the educational projects proposed in it.

The modern artistic design of the textbook promotes the development of visual intelligence of adolescents, convinces of the harmony of the world around them, teaches them to think imaginatively and unconventionally.

The independent study of the textbook materials helps to realise the value of subject competence in chemistry, its importance for every modern person, regardless of the field of future professional activity.