Chapter 6.1
The Big Question #1:
I.
How are Mixtures Classified?
A mixture is classified as a solution, colloid or suspension based on the
size of its largest particles.
A. SOLUTIONS A solution is a mixture containing a solvent and at
least one solute and has the same properties throughout.
1. The solvent is the part of a solution usually present in the largest
amount.
2. The solute is the substance that is dissolved by the solvent.
solute + solvent = solution
“Solutes can be gases, liquids or solids.”
“Water dissolves so many substances that it is often called
the universal solvent”
a) Common Solutions
Solute
Solvent
Solution
Soda Water (CO2 in water)
liquid
Antifreeze (ethylene glycol in water)
Ocean Water (NaCl in water)
Air (oxygen, other gasses in nitrogen)
Grape Juice (sugar in water)
solid
Brass (zinc and copper)
B. COLLOIDS A colloid is a mixture containing small, undissolved
particles that do not settle out.
1. The particles in a colloid are too small to be seen without a
microscope.
2. Fog is a colloid that is made up of water droplets in air. Milk,
shaving cream and smoke are some other examples of a colloid.
C. SUSPENSIONS A suspension is a mixture in which particles can be
seen and easily separated by settling or filtration.
1. It contains visible particles that are larger than the particles in
solutions or colloids.
2. Sand in water, flour in water, soil in water are examples.
The Big Question #2:
I.
How does a solution form?
A solution forms when particles of the solute separate from each other
and become surrounded by particles of the solvent.
A. IONIC SOLUTES For NaCl in water, the positive and negative ions
of the solute are attracted to the partially charged polar water
molecules. The solid crystal dissolves when it becomes surrounded
by the water molecules.
Model
6.1 Exit Ticket
1. What is a solution?
____________________________________________________________
____________________________________________________________
2. Compare and Contrast. How are colloids and suspensions different from
solutions?
____________________________________________________________
____________________________________________________________
3. Suppose you mix food coloring in water to make it blue. Have you made
a solution or a suspension? Explain.
____________________________________________________________
____________________________________________________________
____________________________________________________________
6.1 Exit Ticket
1. What is a solution?
____________________________________________________________
____________________________________________________________
2. Compare and Contrast. How are colloids and suspensions different from
solutions?
____________________________________________________________
____________________________________________________________
3. Suppose you mix food coloring in water to make it blue. Have you made
a solution or a suspension? Explain.
____________________________________________________________
____________________________________________________________
____________________________________________________________