Page
13
1-800-453-8481
Visual Learning Company
Solutions at Work
In Your Own Words (p. 20)
Writing Activity (p. 20)
Answer Key to Student Activities
Soft drinks, seawater, and the air we breathe are
examples of solutions. A solution is a type of
mixture made of two or more substances that are
evenly distributed. The process by which particles in
a substance separate or spread out evenly is called
dissolving. In a solution, the solute is the substance
that is dissolved, and the solvent is the substance in
solvent
solvent
which the solute is dissolved. Water is often called
Water
Water
the universal solvent because it can dissolve so many
substances. Not all solutions can be dissolved in
water. Oil, for example, is insoluble in water. Not
all substances are liquids. The air we breathe is a
mixture of gases and is a solution. Volcanic rocks
and steel are examples of solid solutions.
solid
solid
Alloys are
specifi c types of solid solutions that consist of metals
or nonmetals dissolved in metals.
1. The solute is salt. It is dissolved in water which is
the solvent.
2. You could stir the solution to make it dissolve
faster.
3. You should never taste an unknown substance
because it could be poisonous, make you sick, or hurt
you in some way.
Solution
Appearance
Solute
Solvent
Air
No appearance to
the eye
oxygen and
other gases
nitrogen gas
Soft drink
depends on soda
- brown, orange,
clear, etc. with
bubbles
sugar,
fl avoring, gas
water
Paper clip
silver, metallic, bent
aluminum and
other metals
iron
Powdered
fruit drink
depends on drink -
yellow, orange, etc.
powder
fl avorings and
sugar
water
Piece of
brass
golden-brown color,
shiny, metallic
zinc
copper
Solutions Everywhere (p. 21-22)
1. A solution is a type of mixture made of two or
more substances that are evenly distributed.
2. A solute is the substance that is dissolved and
a solvent is the substance in which the solute is
dissolved.
3. The solid solutions observed were a paper clip
and a piece of brass.
Experimenting with Concentration
(p. 23-25)
Data Results: Students should observe that the
intact sugar cube in hot water dissolved much
slower than the crushed sugar in hot water.
Similarly, the intact sugar cube in cold water
dissolved slower than the crushed sugar in cold
water. Both forms of sugar dissolved faster in hot
water than in cold water. Listed below is some
approximate data.
1. The hot water dissolved the sugar faster than
the cold water.
2. The crushed sugar dissolved faster because
the surface area of the solute (sugar) had been
increased, providing more contact with the solvent
(water).
3. Sugar stirred into hot tea would dissolve
quicker than sugar stirred into iced tea.
4. Crushed sugar would dissolve faster than an
intact sugar cube in a glass of lemonade.
Container
Sugar
Time to dissolve in
seconds
1
cube
approximately 40 sec.
2
crushed approximately 24 sec.
3
cube
approximately 58 sec.
4
crushed approximately 36 sec.
1 2 3 4
Container
5
10 15 20 25 30 35 40 45 50 55 60
T
ime in Seconds to Dissolve