Leaching or solid-liquid extraction is a separation process where often no sharp interface for mass transfer can be defined. In many natural product extraction processes, the “ solid ” contains or is impregnated by a liquid phase. In the extraction of sucrose from beet the cell walls prevent undesired and high molecular constituents from being extracted. Thus the beet is prepared in long strips in order to minimize damage to the cell walls. If fatty oils are extracted the solute is itself a liquid and will diffuse more easily resulting in a faster mass transfer. The latter
is markedly affected if the solute is solid or liquid, incorporated within, chemically
combined with, adsorbed upon, or mechanically in a pore structure of the insoluble material.
Many students with ADHD have significant difficulties with organization.
They are more likely to respond positively when teachers establish class routines and set procedures and maintain a well-organized learning environment.
Clear rules and advanced planning are keys to success for teachers of students with ADHD.
The following organizational supports are particularly useful. Students should be taught to use these tools through teacher modeling and guided practice with feedback before being expected to use them more independently.
Assignment Notebook: Provide the student with an assignment notebook to help
organize homework and seatwork.
Color-Coded Folders: Provide the student with color-coded folders to help
organize assignments for different academic subjects.
