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Mixtures/Solutions/Colloids/Suspensions Webquest!!
http://www.800mainstreet.com/9/0009-001-mix-solut.html
Mixtures
Describe the 2 different types of mixtures and give an example of each.
Homogeneous – uniform throughout; water & ethanol
Heterogeneous – not uniform throughout; mud (water and soil)
Types of Homogeneous Mixtures
Solutions
What distinguishes one mixture from another? Particles
What size are the particles in solutions? Between 0.1 to 2 nanometers
Can light usually pass through the solution? Yes
What makes a blue liquid appear blue? It transmits blue light and absorbs the other colors of the spectrum
What example does the website give of a homogenous mixture? Water and ethanol
What is another example of a homogenous mixture? Water and sodium chloride
Colloids
What is a colloid? Mixtures with particle sizes that consist of clumps of molecules
What are 2 examples of colloids? Fog and milk
Why do colloids appear “murky” or “opaque?” The particles are large enough to scatter light; They do not separate on
standing; They are not separated by filtration
Suspensions
What are suspensions? homogeneous mixtures with particles that have diameters greater than 1000 nm, 0.000001
meter
What are 2 examples of suspensions? Blood and aerosol sprays
Go to: http://www.sciencehq.com/chemistry/properties-of-colloidal-solution.html
What is Brownian Motion/Movement and what causes it? Robert Brown (1927) an English Botanist, observed that the
pollen grains in aqueous suspensions were in constant motion; movement is due to the bombardment of colloidal
particles by molecules of dispersion medium
What is the Tyndall Effect and what types of solutions exhibit this? When a strong beam of light is focused on a colloidal
solution the path of the beam becomes visible and when viewed through microscope placed at right angle to the path of
light (ultramicroscopically), the colloidal particles appear as pin points of light moving against a dark background in a
colloidal solution; not observed in case of true solution
What causes the Tyndall Effect? Due to scattering of light by colloidal particles