NATS 1870 Lecture Notes - Lecture 12: Hydrogen Bond, Tyrian Purple, Mordant
23 Jan 2019
School
Department
Course
Professor
Document Summary
Week 12 chemistry and colour cont": oxidation and reduction. A large number of redox reactions involve electron transfer in the same general way that a large number of acid-base reactions involve a transfer of protons. Our understanding of oxidization has changed from a limited concept where the reaction had to involve oxygen to a reaction where substances exchange electrons. A redox reaction can create a new molecular substance: often signaled by a colour change (the new substance has a new molecular structure energy level spacing changes colour changes) Some indicators are sensitive to oxidization levels: methelyne blue, colourless in reduced form leucomethelyne blue , blue in oxidized form. Oxidization gaining oxygen, or the removal of electrons (reaction does not need to involve oxygen specifically. Reduction losing oxygen, or the gain of electrons. Redox reactions are paired: one species loses electrons = is oxidized, one species gains electrons = is reduced.
