Solution. 1  This species has a 2â charge on it, so it is an anion. Anions are named using the stem of the element name with the suffix -ide added. 2  Because this species has no charge, it is an atom in its elemental form. This is cobalt. 3  In this case, there is a 2+ charge on the atom, so it is a cation.
1. 2. 3. The walls of the alveoli are composed of a single layer of flattened epithelial cells, as are the walls of the capillaries, so gases need to diffuse through just two thin cells. The alveoli walls are kept moist by water diffusing from the surrounding cells.he walls of the alveoli are composed of a single layer of flattened epithelial cells, as are the walls of the capillaries, so gases need to diffuse through just two thin cells. The alveoli walls are kept moist by water diffusing from the surrounding cells.
Best Answer: Nonpolar and lipid-soluble substances diffuse directly through the lipid bilayer. Such substances include oxygen, carbon dioxide, and fat-soluble vitamins. In facilitated diffusion, molecules are passively transported using carriers or channels.Examples include glucose, ions, and water.est Answer: Nonpolar and lipid-soluble substances diffuse directly through the lipid bilayer. Such substances include oxygen, carbon dioxide, and fat-soluble vitamins. In facilitated diffusion, molecules are passively transported using carriers or channels. Examples include glucose, ions, and water.