a practical study of substances and their properties

摘要

the model refers to a set of practical study of substances and their properties as part of training on the subject "man and nature" in five grade of bulgarian schools in line with established curricula, to ease the learning process, to improve the quality of training and showed interest in mr. and students to the formation of practical knowledge and skillsassociated with observations of inanimate and living nature in its unity and diversity.the set includes: - set of reagentscontaining 10% n solution of hydrochloric acid (hcl) from 100 to 300 ml; 10% n acetic acid solution (u0441u043d3u0441u043eu043eu043d) from 100 to 300 ml; 40% n solution of ethanol (c2h5oh) from 100 to 300 ml; 5% en u0440u0430u0437u0442u0432u043e p of sodium hydroxide (naoh) from 50 to 200 ml; 30% solution of hydrogen peroxide (h2o2) from 100 to 300 ml; 1% n solution of u043cu0435u0442u0438u043bu0442u0438u043eu043du0438u043du0438u0435u0432 dioxide (methylene blue) from 50 to 250 ml; tv u044au0440u0434 u043au0443u043fu0440u043eu0441u0443u043bu0444u0430u0442 (cuso4.5h2o) from 50 to 100 g; solid sodium chloride (nacl) from 50 to 100 g; solid calcium hydroxide ((oh) 2) from 50 to 100 g; solid calcium carbonate (caco3) from 50 to 100 g; solid aluminium sulfate (al2 (so4).12h2o) from 100 to 200 g; solid manganese dioxide (u043cnu043e2) from 50 to 100 g charcoal powder or granules from 50 to 100 g; - a set of laboratory equipment containing u0435u043fu0440u0443u0432u0435u0442 ki volume 16 ml of 10 to 30 the number; colby u0435u0440u043bu0435u043du043cu0430u0439u0435u0440, 250 ml - 1 to 10.; beakers 250 ml of 5 to 10 the number; a cylinder, 100 ml - 1 to 3 number; pipettes, 3 ml of 5 to 10 the number; a tubes - 1; brush for cleaning the tubes - 1 3 the number; protective glasses from 1 to 10.; funnel, 250 ml - 1 to 5 units; bent tube, a right angle, 20? 5 cm to tap a number from 1 to 10; hose rubber with u043au0430u043fu0438u043bu044fu0440u043au0430 from 1 to 10 the number and a spatula or spoon from 1 to 5 number and - guidance for work submitted to u0435u043bu0435u043au0442u0440u043eu043du0435 mr or paper containing detailed instructions for conducting laboratory exercises, equipment safetyinstruction for first aid in an accident and method for collection and disposal of waste chemicals.