Chapter 12.1 Notes
8R
Types of Mixtures
Homogeneous- uniform throughout (at
molecular level)
Heterogeneous- not uniform
Organize the following mixtures as homogeneous or
heterogeneous.
Homogeneous
Heterogeneous
Lucky charms cereal
Sterling silver
Orange juice (with pulp)
Air (in the classroom)
Air filled with smoke
Milk
Sugar water
Clay and water mixed
Ocean water
I. Solutions
Soluble-capable of being dissolved
____________ is an example that is insoluble in
water.
Solution- a homogeneous mixture of two or more
substances in a single phase.
Atoms, molecules, or ions are thoroughly mixed; the
mixture has the same composition throughout.
A. Components of Solutions
Solvent- dissolving medium; the component
with greater quantity.
Solute- substance being dissolved; the one w/
lesser amount
B.
Types of Solutions
Look at Table 1.
Name the solvent and the solute.
Mixture
solvent
solute
water
sugar, salt, colors,
Gatorade
preservatives
water
fat, Ca, sugar
milk
water
CO2, HFCS, color,
soda
acid
O2
air (in the class) N2
Au
Ag, Cu
14-karat gold
water
ethanol, sugar
Wine
II. Suspensions
Suspension- a type of mixture in which the particles
settle out when it’s no longer stirred.
Examples: oil and water, mud and water, ketchup
III. Colloids
Colloid- a mixture in which particles are intermediate
in size between those in solutions and suspensions.
The particles are larger than those in a solution but
they stay mixed.
Examples:
Look at the examples in Table 2 on pg 404. Write
three examples in your notes.
A. Tyndall Effect
The Tyndall Effect occurs when light is
scattered by colloidal particles.
Example: when you can see a headlight beam
from the side on a foggy night.
IV. Solutes: Electrolytes vs. Nonelectrolytes
Electrolyte – a substance that dissolves in water
to give a solution that conducts electricity.
= Ionic.
Nonelectrolyte - a substance that dissolves in
water to give a solution that does not conduct
electricity. = Covalent.
Examples:
NaCl – is an electrolyte because it’s ionic
Sucrose – is a nonelectrolyte because it’s
covalent
HW: Section 12.1 Review
# 1-6 on page 406