???? Download useful files to prepare for the OGE in chemistry: In TG — https://t.me/+AHojOI7TfPJlNWI6 Prepare for the OGE with Umskul ???? Follow the link to sign up — http://t.me/predbanmanager_bot?start=... ????????‍???? The class is taught by Alexandra Lebedeva, a chemistry teacher at the Umskul online school. Social networks ↓ Sasha's Telegram: https://t.me/+AHojOI7TfPJlNWI6 VKontakte newsletter: https://vk.cc/clz4Kv Reviews of the classes: https://vk.cc/8NQsfR ???? To get a consultation, call the hotline - 8 800 300 63 24 ???? Subscribe to the channel, like and ring the bell so as not to miss new webinars! Time codes ???????? 0:00:46 - Getting to know the teacher 0:01:29 - Information about the telegram channel 0:01:57 - What is an "atom"? 0:02:38 - The structure of the atom. Nucleus and electron shell 0:03:15 - The structure of the atom. Protons, neutrons and electrons 0:04:34 — How to determine the number of protons, neutrons and electrons in an atom? 0:08:10 — The structure of the atom. Energy levels 0:13:36 — Practice. Task #1 (#2 from the OGE KIM: determine the period number and group number in which the chemical element is located) 0:15:13 — Practice. Task #2 (#2 from the OGE KIM: determine the atomic number of the chemical element and the group in which it is located) 0:16:26 — Information about task #1 on the OGE in chemistry 0:18:16 — Definition and characteristics of a chemical substance 0:20:24 — Definition and characteristics of a chemical element 0:23:19 — Practice. Task #3 (#1 from the OGE KIM: select the statements that talk about potassium as a simple substance) 0:24:50 — Practice. Task #4 (#1 from the OGE KIM: select the statements that talk about chlorine as a simple substance) 0:26:30 — Formulation of the Periodic Law 0:28:15 — The structure of the periodic table. Groups and periods 0:32:45 — How to distinguish metals from non-metals in the periodic table? 0:36:52 — Generalized scheme of changing properties according to the periodic table 0:41:06 — Practice. Task #5 (#3 from the OGE KIM: arrange the chemical elements in order of increasing atomic radius) 0:43:15 — Practice. Task #6 (#3 from the OGE KIM: arrange the chemical elements in order of decreasing electronegativity) 0:43:49 — Practice. Task #7 (#3 from the OGE KIM: arrange the chemical elements in order of decreasing reducing properties) 0:45:54 — What is a "chemical bond"? 0:48:57 — Types of chemical bonds 0:49:45 — Covalent non-polar and covalent polar bonds 0:51:33 — Ionic bond 0:54:21 — Metallic bond 0:54:33 — Brief diagrams of the types of chemical bonds 0:54:58 — Practice. Task #6 (#5 from the OGE KIM: select the substances that are characterized by a covalent polar bond) 0:55:59 — Practice. Task #7 (#5 from the OGE KIM: select substances that are characterized by a covalent non-polar bond) 0:57:30 — What is "oxidation state"? 0:58:12 — Basic information about oxidation states 1:00:44 — Constant oxidation states 1:06:13 — Algorithm for determining the oxidation state in a substance 1:09:43 — Practice. Task #8 (#4 from the OGE KIM: determine the oxidation state of nitrogen in compounds) 1:13:25 — Practice. Task #9 (#4 from the OGE KIM: determine the oxidation state of manganese in compounds) 1:15:10 — What is "valence"? 1:17:42 — Practice. Task #10 (#4 from the OGE KIM: determine the valence of chlorine in compounds) 1:19:40 — Classification of inorganic compounds 1:20:46 — Simple and complex substances 1:23:13 — General characteristics and nomenclature of oxides 1:26:45 — General characteristics of amphoteric hydroxides 1:27:18 — Classification of oxides. Basic, amphoteric and acidic oxides 1:30:23 — General characteristics and classification of bases 1:32:37 — General characteristics of amphoteric hydroxides 1:33:19 — Nomenclature of bases and amphoteric hydroxides 1:35:47 — General characteristics and nomenclature of acids 1:37:42 — Classification of acids. How to determine the strength of an oxygen-containing acid? 1:39:50 — General characteristics and nomenclature of salts 1:41:30 — Classification of salts 1:43:49 — Practice. Task #11 (#7 from the OGE KIM: select a basic oxide and a non-salt-forming oxide) 1:45:11 — Practice. Task #12 (#7 from the OGE KIM: select an amphoteric oxide and an acid) 1:46:31 — Chemical reactions and reaction equations 1:48:20 — Law of conservation of mass 1:49:46 — Signs of chemical reactions 1:50:18 — Classification of chemical reactions by the number of reactants and reaction products 1:52:12 — Classification of chemical reactions by thermal effect 1:53:43 — Classification of chemical reactions by changes in oxidation states 1:54:09 — Practice. Task #13 (#11 from the OGE KIM: select exchange reactions) 1:54:49 — Practice. Task #14 (#11 from the OGE KIM: select substitution reactions) 1:56:58 — Task #13 on the OGE in chemistry 1:57:35 — What is "electrolytic dissociation"?