Solutions, Suspensions and
Colloids
Activity 2-4
Key Concepts: mixtures vs. pure substances, types of
mixtures
Materials Needed
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Large test tubes with stoppers (6/group)
Beral pipettes (1/group)
Weigh boats (3/group)
Laser pen (1/group)
Ringstand (1/group)
Filter paper (5/group)
3” funnel, short stem (1/group)
50-mL beaker (1/group)
Milk (1/2 pint/class)
Olive oil (25 mL/class)
Balance, 0.01g (1-2/class)
Soil (1 cup/class)
5 g CuSO4
5 g NaCl
Types of matter concept map (4 class sets)
Do Now September 8/10
I hope you enjoyed your Long weekend.
During the long weekend I ate:
3.057
0.0025
4500
0.0500
Hotdogs
Bags of Chips
Cookies
Juice Boxes
List the number of significant figures for each
number above.
Significant Figure Answers
Hot dogs 3.057
4
 Bag of chips 0.0025
2
 Cookies
4500
2
 Juice Boxes 0.0500 3
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Objective
I
can identify the differences
between pure substances and
mixtures while identifying
characteristics of solutions,
suspensions, and colloids using
a lab activity.
Agenda
1.
2.
3.
4.
5.
6.
7.
8.
9.
Do Now, Objective (10 min)
Sig Figs Calculation Review (5 min)
Mixtures vs. Pure Substances (5 min)
Solutions, Suspensions and Colloids Lab (20
min)
Chem Talk Reading (15 min)
Notes (10 min)
Solutions, Suspensions and Colloids Lab 2
(10 min)
Brainpop Video (5 min)
Exit Ticket
Homework – Due Thursday/Friday

Complete HW #9

Due Wednesday/Monday
Think Pair Share
 Chemistry
is defined by two
different types of materials –
‘mixtures’ and ‘pure substances’.
What do you think some of the
differences between mixtures and
pure substances might be?
Sig Fig Calculations Review
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Adding and Subtracting
◦ Answer is determined by the number of
decimal places
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Multiplying and Dividing
◦ Answer is determined by the number of
significant figures
Mixtures vs. Pure Substances
Draw this diagram (including particle diagrams) in your notes.
Pure Substance
VOCABULARY
Made up of only one kind of matter and
has a unique set of properties.
 A pure substance is made of either one
element or a compound.
 Example: carbon is an element and sugar is
a compound.

Carbon (element)
Sugar (compound)
Mixture

Mixtures are physically combined
structures that can be separated into
their original components (parts).
Examples
- Iced tea
- Lemonade
- Hot cocoa
Think Pair Share

Is it easier to separate milk from coffee
or milk from a bowl of cereal? Why?
Solutions, Suspensions and Colloids Lab
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In today’s lab, you will be examining the
properties (characteristics) of 5 different
mixtures.
You will use your observations to learn
about the three different types of ‘mixtures’
that exist in the world:
◦ Solutions
◦ Suspensions
◦ Colloids
Lab Groups
Lab Groups
Lab Groups
Lab Groups
Form Groups
1.
2.
3.
Go to your group’s station
Assign group roles
Send the Time/Materials Manager to get
a lab worksheet
Get Materials and Complete Lab

Complete Parts A – F with your group
Time: 25 minutes
Step 5 – Clean Up Materials

Complete STEP 5 – Clean Up
Materials.
◦ Make sure to return all the materials to the
front of the room

Return to your assigned seat.
Chem Talk

Complete the Chem Talk reading on page
122 of your textbook.
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Define the following terms in your
vocabulary section
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Pure substance
Solution
Solute
Solvent
Colloid
Suspension
Types of Mixtures

Mixtures: substances that can be taken apart
or separated physically (for example with a
filter, magnet, etc.).
◦ Solution: a homogeneous mixture of two or more
substances. Homogeneous means that the mixture
looks the same throughout (ex: salt water)
◦ Suspension: a heterogeneous mixture that
contains fine solid particles in a liquid. The solid
particles will settle to the bottom (ex: fine sand and
water, sand sinks eventually)
◦ Colloid: a ‘cloudy’ heterogeneous mixture that has
particles which remain in suspension (ex: fog, butter)
Solutions – homogeneous
◦ Solutions have two parts – solute and solvent
 Solute: what is dissolved
 Solvent: what the solute is dissolved in (often
water)
 Not
all materials form solutions.
◦ Things that do not mix are IMMISCIBLE (not
mixable)
Suspensions

Suspensions have large, visible particles
that settle out of the medium over time.
Solutions vs. Suspensions
Colloids

Colloids are between solutions and
suspensions. The particles are bigger than
those in solutions, but they don’t settle out.
Milk is a colloid because
liquid globs of fat are
spread throughout water
Tyndall Effect
Tyndall Effect
LAB – Part G
Go back to your lab groups
 Use your understanding of mixtures to
complete Part G – Analysis with your
group
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Finish Lab
Turn your lab into the proper bin
 Return to your assigned seat.
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BrainPop
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http://www.brainpop.com/science/mattera
ndchemistry/compoundsandmixtures/
Exit Ticket
1.
Which of the following is a colloid? Explain.
a.
b.
c.
d.
2.
NaCl dissolved in water
Milk
Sand mixed with water
Raisin bread
If a solute dissolves completely in a solvent in all
proportions, that substance is said to be:
a.
b.
c.
d.
Immiscible
Heterogeneous
Miscible
A suspension