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Current courses to prepare for the Unified State Exam for 90+ ???? https://webium.cc/chemists #chemistryUSE #TaisiyaFlamel #Webium #USE2022 During the webinar, we will get acquainted with the concepts of valence, donor-acceptor bond and oxidation state. All these definitions can be found in task 3, the practice of which is also present in this lesson! Want more? Scroll below and get gifts ???? Subscribe, like, ring the bell and all that :) Timestamps: 00:00 - Setting up the web 02:20 - About me 05:10 - Valence. How to calculate valence 06:49 - Valence in the Unified State Exam. Highest valence 08:43 - Exceptions F, O, N. Valence of nitrogen, fluorine and oxygen 15:42 - Donor-acceptor bonds 16:02 - Problem 1 17:20 - Problem 2 20:13 - Problem 3. General formulas of hydrogen compounds 23:00 - Problem 4 26:00 - Oxidation state 27:36 - Which elements have a constant oxidation state 30:47 - Which elements have an ALMOST constant oxidation state 35:55 - Minimum oxidation state 37:20 - Maximum oxidation state. Life hack on how to easily remember 40:50 - Problem 5. From the elements listed in the row, select two elements that have the same lowest oxidation state 42:44 - Problem 7. From the elements listed, select two elements that have the maximum oxidation state of +2. 44:01 - Problem 8. From the given elements, select two elements for which the difference between max and min is the same 46:23 - Problem 9. From the given elements, select two elements for which the anions with the general formula formed by them can have the same oxidation state 49:10 - Problem 10. Two elements that have the same oxidation states in oxygen-containing anions 52:35 - Problem 11. Two elements that have an oxidation state of +5 in higher oxides