Post on 18-Jan-2016
transcript
Mathematics & Science Center
Objectives
Define mixture.Classify as homogeneous
or heterogeneous.
Define solution.Explain how light interacts with mixtures.
Explain “like dissolves like.”
Mixtures
Properties of Mixtures
No chemical reaction occurs.Composition of mixture may vary.
Substances may be separated physically.
Types of Mixtures
Heterogeneous or Homogeneous?
Solutions
Solute
Solvent
Solution
Substances Mixed With Water Dissolve? Separate? Reflect Light? Homogeneous? Heterogeneous?
Salt
Pepper
Tea Leaves
White Vinegar
Oil
“All Mixed Up?” Team Report
Mathematics & Science Center
Yes
Yes
No
Yes
Yes Yes Yes
Yes Yes Yes
Yes
Yes Yes
No
NoNoNo
No
No
NoNo
No
NoNoNo
Like Dissolves Like
Like Dissolves Like
What happens at the molecular level?
Sugar
Oil
Sand
Colloids
Colloids
Adding flour to water with stirring forms
________.
a. a compound
b. a heterogeneous mixture
c. a homogeneous mixture
What happens when a beam of light passes through a homogeneous mixture?
a. The mixture appears clear.
b. The mixture appears opaque.
c. The mixture scatters the light and appears to glow.
The composition of a mixture _______.
a. is always constant
b. may vary
c. never varies
All mixtures contain a liquid and a solid.
a.True
b. False
A colloid is a special type of heterogeneous mixture.
a.True
b. False