==>> For more on Mixtures
(Solutions, Suspensions, Emulsions, Colloids
transparent and homogeneous
heterogeneous, at least two substances visible||Cloudy
but uniform and homogeneous|
than 10,000 Angstroms||10-1000
-- light passes through, particles do not reflect light||variable
is dispersed by colloidal particles |
will eventually |
solution is always transparent, light passes through with no scattering
from solute particles which are molecule in size. The solution is homogeneous
and does not settle out. A solution cannot be filtered but can be separated using
the process of distillation.
suspension is cloudy and heterogeneous. The particles are larger than 10,000
Angstroms which allows them to be filtered. If a suspension is allowed to stand
the particles will separate out.
colloid is intermediate between a solution and a suspension. While a suspension
will separate out a colloid will not. Colloids can be distinguished from solutions
using the Tyndall effect. Light passing through a colloidal dispersion, such as
smoky or foggy air, will be reflected by the larger particles and the light beam
will be visible. A hydrocolloid can simply be defined as a substance that forms a gel when it comes in contact with water. Such substances include both polysaccharides and proteins .