To help students learn the appropriate text structures, text features, and language of informative/explanatory writing, teachers might begin with Talk-alouds. Below you will see two 2nd grade examples that focuses on the use of diagrams. These are a paired set of a Reading Talk-aloud and a Writing Talk-aloud.
functional group. n. An atom or group of atoms, such as a carboxyl group, in an organic compound that defines the structure of a family of compounds and determines the properties of the family. functional group. n.
A functional group is a portion of a molecule that is a recognizable/classified group of bound. atoms. In organic chemistry it is very common to see molecules comprised mainly of a carbon. backbone with functional groups attached to the chain. The functional group gives the molecule. its properties, regardless of what molecule contains it*; they are centers of chemical reactivity. The functional groups within a molecule need to be identified when naming. *Definition taken from Lecture Supplement, First Edition by Steven Hardinger, Copyright 2008.