CE 3231 - Introduction to Environmental Engineering and Science Readings for Next Class : Section 2.5 O hio N orthern U niversity Introduction Chemistry,

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CE Introduction to Environmental Engineering and Science Readings for Next Class : Section 2.5 O hio N orthern U niversity Introduction Chemistry, Microbiology & Material Balance Water & Air Pollution Env Risk Management Common Reaction Types Within environmental chemistry reactions are carried out within water or within air.

Lecture 6 Common Reaction Types (Chemistry III)

Equilibrium Review

Reactions Most Common Reaction Types for Environmental Engineers Hydrolysis/Dissolution Photolysis Precipitation Acid-Base Redox Complexation Gas-Liquid Transfer

Hydrolysis Water inserts itself into a molecule Hydrolysis Video

Photolysis Energy from light inserts itself into a molecule Breakdown of a chemical by photons Photosynthesis Video Photolysis Video

Precipitation Two dissolved molecules come together to form a solid Precipitation Rxn

Acid-Base Acid-base Definition – Acid: gives off H + – Base: accepts H + – conjugate acid-base pair – H 2 O can be either acid or base – Instantaneously fast reactions acid base base acid acid base Brønsted-Lowry definition Acid base example

Oxidation Reduction Redox Definition - transfer of electrons (change of oxidation state) Gain election(s): reduced (GER) Lose electron(s): oxidized (LEO) – slow reactions Redox Visual

Complexation – Coordination of 2 (or more) atoms, molecules or ions to form more stable products Complexation visuals

Gas-Liquid Transfer Liquid to gas transfer visuals