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 – August 25/26
 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?
Objective
I
can explain the differences
between types of mixtures,
graphically and in writing, using a
macro-nano-symbolic table.
Homework – Due Thursday/Friday

Make a graphic organizer showing the
following terms:
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Mixture
Pure substance
Element
Compound
Heterogeneous mixture
Homogeneous mixture
Solution
Suspension
colloid
Agenda
Do Now, Objective (5 min)
 Mixtures vs. Pure Substances
 Solutions, Suspensions and Colloids Lab
 Chem Talk Reading
 BrainPop Video
 Solutions, Suspensions and Colloids Lab 2
 Chem to Go: Individual Practice
 Exit Ticket

Mixtures vs. Pure Substances
Draw this diagram (including particle diagrams) in your notes.
Solutions, Suspensions and Colloids

One way to get different types of
materials is to mix them together. Lots of
different things can happen when
materials are mixed. Each mixture has its
own properties (characteristics)

Taking mixtures apart is much harder!
Think Pair Share

Is it easier to separate milk from coffee
or milk from a bowl of cereal? Why?
Solutions, Suspensions and Colloids
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
1.
2.
3.
4.
5.
6.
7.
8.
Noah, Wendy, Irma, Adrian
Charlie, Daira, Edgar T., Cecilia
Tierra, Christopher, Kassandra, Marjon
Silvia, Andy, Nataly, Edgar M
Samantha, Coral, Jesus, Edgar S.
Alejandro, Gabriela, Sarah, Christian
Brayan, Maria, Leidy, Whitney
Alondra, Elva, Ulises, Eriberto
Lab Groups
1.
2.
3.
4.
5.
6.
7.
Kaley, Juan, Jean, De’Oshana
Tajane, Oscar, Ever, Cookies
Saisha, Ricardo, David
Jose B., Alejandro, Gabriel, Keioshana
Yaridt, Danny, Liliana, Kaley
Daniel G., Gerald, Luz, Denys
Rolando, Antonia, Corina, Cristobal
Lab Groups
1.
2.
3.
4.
5.
6.
7.
Kaley, Juan, Jean, De’Oshana
Tajan’e, Oscar, Ever, Cookies
Saisha, Ricardo, David, Carlos Castillo
Jose B., Alejandro, Gabriel, Carlos Cisneros
Yaridt, Danny, Liliana, Jose R.
Daniel G., Luz, Denys, Keioshana
Rolando, Antonia, Corina, Cristobal
Lab Groups
1.
2.
3.
4.
5.
6.
7.
8.
Josse A., Dulce, Justice, Pedro
Aaron, Efren, Lesly F., Sarita
Leslie A., Adrian, Jackie, Milagro
Jazmin H., Bruno, Bryan
Tatyana, Emilia, Juan I., Jorge B.
Joryn, Saul, Jessica L., Danya
Julian,Yizel, Jose R.
Jose V., Natrurell, Natalie G.
Lab Groups
1.
2.
3.
4.
5.
Alejandra, Alanis, Juan, Miguel
Imani, Eliot, Isaac, Alondra G.
Gnalen, Darrion, Lizbeth, Lesly
Jennifer E., Anifa, Jennifer A., Esperanza
Alondra A., Brenda,Vilma, Sandy
Form Groups
Go to your group’s station
 Assign group roles
 Send the Time/Materials Manager to get a
lab worksheet
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Step 1 – Get Materials
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Complete STEP 1 – Get Materials
with your group.
Step 2 – Setup Lab Station
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Complete STEP 2 – Setup Lab
Station with your group
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PUT ALL MATERIALS IN DIFFERENT
TEST TUBES
◦ Make sure that all test tubes are labeled
◦ Spokesperson: take notes on your data
table
Step 3 – Mix the Mixtures
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Complete STEP 3 – Mix the Mixtures
◦ Make sure that you write down observations
as you mix the mixtures
Step 4 – Run Tests on Mixtures
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Complete STEP 4 – Run Tests on
Mixtures
◦ Use the laser pointer carefully
◦ If you do not know how to fold the filter
paper into a funnel, ask Ms. Bergman
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
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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
BrainPop
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http://www.brainpop.com/science/mattera
ndchemistry/compoundsandmixtures/
Types of Mixtures
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When different substances are mixed together,
and can be taken apart physically they are called
Mixtures.
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Solution: a homogeneous mixture of two or
more substances. Homogeneous means that the
mixture looks the same throughout.
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Suspension: a heterogeneous mixture that
contains fine solid particles in a liquid. The solid
particles will settle to the bottom.
Solutions
 Solutions
have two parts – solute and
solvent
◦ Solute: what is dissolved
◦ Solvent: what the solute is dissolved in
Solutions
 Not
all materials will form solutions.
Sometimes, the solute doesn’t dissolve in the
solvent. When this happens, the materials are
said to be IMMISCIBLE (not mixable). If the
solute dissolves completely, then the materials
are MISCIBLE (mixable)
The oil is immiscible in the water.
Suspensions
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Suspensions have the largest particles.
These particles will float at first, but
eventually settle out from the material
they’re floating in.
Solutions vs. Suspensions
Colloids
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Colloids are between solutions and
suspensions. The particles are bigger than
those in solutions, but they don’t settle to
the bottom like in suspensions.
Milk is a colloid because
liquid globs of fat are
spread throughout water
LAB – Step 6
Go back to your lab groups
 Use your understanding of mixtures to
complete STEP 6 – Analysis with your
group
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Chem Essential Question
Macro
- The solutions look the
same throughout.You
cannot see differences in
them. The laser goes
straight through
- The suspensions look the
same at first, but
eventually the particles
settle out. The laser
doesn’t go through.
Nano
- The solute particles are
so small that they cannot
be seen
- The particles in the
suspensions are large
enough that they can be
seen, and eventually settle
out
- The particles in the
colloid are too small to
- The colloids look like one
see, but large enough that
material, but the laser
they disrupt the laser
does not go straight
pointer
through
Symbolic
Finish Lab
Turn your lab into the proper bin
 Return to your assigned seat.
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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
Mixtures Day 2
Do Now
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Explain the difference between
suspensions, solutions and colloids in 2-3
complete sentences.
Do Now

Explain the difference between suspensions,
solutions and colloids in 2-3 complete
sentences.
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Solutions, suspensions and colloids are
different types of mixtures. They are made up
of more than one substance and are not
chemically combined. Solutions are
homogeneous (look the same), but suspensions
and colloids are heterogeneous (look different).
Suspensions have large particles that can be
seen, and colloids have medium-sized particles
that can be seen with a microscope.
Objective
Agenda
Do Now, Objective (5 min)
 Review Mixtures (15 min)
 Mass and Volume Lab (20 min)
 Mass and Volume Analysis (20 min)
 Significant Figures Mini-Lesson (10 min)
 Weekly Quiz (15 min)
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Guided Notes
Classify each of the following as a suspension, colloid,
or solution. Explain your reasoning. (Hint: in some cases
more than one answer may be possible).
A. A mixture is poured through a filter and the entire
mixture passes through
B. A mixture is left to stand for a while and small
particles settle out
C. When viewed under a microscope, small particles
are visible in the mixture
D. A beam of light passed through the mixture is
scattered.
E. The mixture is blue and transparent (see-through)
Guided Notes
Classify each of the following as a suspension, colloid, or
solution. Explain your reasoning. (Hint: in some cases more than
one answer may be possible).
A. A mixture is poured through a filter and the entire mixture
passes through – Solution. The particles are small, and pass
through the filter.
B. A mixture is left to stand for a while and small particles
settle out – Suspension. You can see the particles settle out.
C. When viewed under a microscope, small particles are visible
in the mixture – Colloid. The particles are slightly larger, and
can be seen with a microscope.
D. A beam of light passed through the mixture is scattered. –
Colloid – the mixture scatters light.
E. The mixture is blue and transparent (see-through) –
Solution, the particles are extremely small.
Guided Notes
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Suggest a method you could use to
separate the different materials in each of
the following mixtures
◦ Solutions
◦ Colloids
◦ Suspensions
Guided Notes

Suggest a method you could use to
separate the different materials in each of
the following mixtures
◦ Solutions – Evaporation. Think about what
happens to your gym clothes after you sweat
in them.
Guided Notes
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Suggest a method you could use to
separate the different materials in each of
the following mixtures
◦ Colloids – Evaporation
Guided Notes

Suggest a method you could use to
separate the different materials in each of
the following mixtures
◦ Suspensions – filtration. You can see the bigger
particles get caught in the filter while the
smaller particles go through.
Types of Substances Graphic
Organizer
Draw this graphic organizer in your notes
Significant Figures

https://www.youtube.com/watch?v=_jZAe
9xeTFA
Rules for Significant Figures
Non-Zero = ALWAYS COUNT
1.
◦ 28.1 contains three significant figures
◦ 11,387 contains five significant figures
Captive 0’s = ALWAYS COUNT
2.
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1004 contains four significant figures
5091.08 contains six significant figures
Leading 0’s = NEVER COUNT
3.
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Zeros to the left of the first non-zero digit are not significant; they indicate the position of the
decimal point
0.0086 contains two significant figures
0.02088 contains four significant figures
Trailing 0’s = SOMETIMES COUNT
4.
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Zeros to the right of the decimal point are significant if they are at the end of the number (or if
they are followed by non-zero digits).
0.0120 contains three significant figures
820.0 contains four significant figures
90.00380 contains seven significant figures
Weekly Quiz
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15 minutes
Solutions, suspensions, colloids
 Mass, volume and density
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Good luck! Do your best!