Содержание
- 3. Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom or a
- 4. ЭЛЕКТРООТРИЦАТЕЛЬНОСТЬ ЭЛЕМЕНТОВ это способность одних атомов оттягивать на себя электроны от других атомов при взаимодействии
- 5. Not all atoms attract electrons with the same force. The amount of "pull" an atom exerts
- 6. An amount of electrons which was lost or gained by the atom in a chemical compound
- 8. The increase in oxidation state of an atom through a chemical reaction is known as an
- 9. In 1st reaction no change of oxidation degrees of atoms: In 2nd equation we see that
- 10. Oxidation-Reduction Reactions are all reactions that involve the change of an oxidation number, and transfer of
- 11. The chemical substance which loses electrons, is oxidised (as result increases its valency) and called the
- 12. IMPOTANT OXIDANTS An oxidizing agent: contains an element whose oxidation state decreases in a redox reaction
- 13. IMPOTANT REDUCTANTS A reducing agent: contains an element whose oxidation state increases in a redox reation
- 14. Some substances containing elements in the intermediate oxidation may be oxidants or reductants: Halogens in basic
- 15. H2+O2– Na2S+4O3 S0 H2+O–2 2О– +2е→2О-2 2О– -2е→ О20 Na2S–2 О20 Na2S+6O4 S+4 +6e → S–2
- 16. + 1 - 1 - 2 - 3 - 4 - 5 - 6 + 2
- 17. REDOX REACTION TYPES Intermolecular redox reactions in which the oxidant and reductant are part of different
- 18. DISPROPORTIONATION REACTIONS In some redox reactions, called disproportionation reactions, the same substance is both oxidized and
- 19. +5 +7 -1 -2е +6е 0 -1 +1 -1е +1е DISPROPORTIONATION REACTIONS
- 20. METHODS OF BALANCING REDOX REACTIONS 1) The Oxidation-Number Method (ionic balance): the key to this method
- 21. 2) Half Reactions Method (electronic balance): 1) Write and balance separate half-equations for oxidation and reduction,
- 22. H2O (+3e) KMnO4 Mn+2 MnO2 K2MnO4 H+ (+5e) OH– (+1e) In acidic solution: 2KMnO4 + 5Na2SO3+
- 23. Влияние среды на изменение степеней окисления атомов химических элементов
- 24. Влияние среды на изменение степеней окисления атомов химических элементов
- 25. Влияние среды на изменение степеней окисления атомов химических элементов
- 26. GLOSSARY Oxidation Any chemical change in which at least one element loses electrons, either completely or
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