Name: ___________________________________
Period: ______
Diffusion Demonstration: In this demonstration we will be using hot and cold water and a solute which
has a greater density than water (food coloring).
Define diffusion:
_____________________________________________________________________________________
Problems:
(1) How will heat (temperature) affect the rate of diffusion?
(2) How will gravity affect the rate of diffusion?
Hypothesis:
Use ‘If…then…’ format and write a hypothesis about each of the problems/questions stated above (you
will be writing two separate hypotheses; one about heat, the other about gravity).
(1) ______________________________________________________________________________
______________________________________________________________________________
(2) ______________________________________________________________________________
______________________________________________________________________________
Procedure:
Observe the demonstrations and make notes (in the spaces provided of your teacher’s discussion about
them) and fill in the diagrams (with the colors as instructed by your teacher) to see if your hypothesis is
correct.
Materials:
Colored pencils:
Green
Red (hot water)
Orange
Light blue
Dark blue (cold water)
Purple (mixture of hot and cold)
Data:
A. GAS—diffusion of gases. Dots in the diagram represent gas molecules of perfume (we already
did this one in class, included here as a reminder).
BEFORE
AFTER
B. LIQUID—diffusion of liquids. Drops of concentrated food coloring into water (we also already
did this one in class, included here as a reminder). Dark dot at top of the before is a drop of food
coloring, using the color green, show the diffusion of the food coloring in the after diagram.
BEFORE
AFTER
C. SOLID—diffusion of solids using crystals of potassium permanganate placed into room
temperature water. No coloring here, just observe…
1
YOU SHOULD BE WRITING NOTES AS YOU LISTEN TO MY COMMENTS DURING THIS DEMO, A SPACE IS
PROVIDED BELOW FOR YOUR NOTES
D. LIQUID/COLD WATER—diffusion of liquids using only cold water. Color in the dotted portion of
the before diagram dark blue. The top of the before contains cold water and blue food coloring,
the bottom contains just cold water. Observe the demonstration and when instructed to do so,
color the after diagram showing results, using the proper colors.
(Hint: paler shades of dark blue should be colored in using light blue)
BEFORE
AFTER
E. LIQUID/COLD WATER—diffusion of liquids using only cold water. Color in the dotted portion of
the before diagram dark blue. The top of the before contains cold water, the bottom contains
cold water and blue food coloring. Observe the demonstration and when instructed to do so,
color the after diagram showing results, using the proper colors.
(Hint: paler shades of dark blue should be colored in using light blue)
BEFORE
AFTER
NOTES:
_____________________________________________________________________________________
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2
YOU SHOULD BE WRITING NOTES AS YOU LISTEN TO MY COMMENTS DURING THIS DEMO, A SPACE IS
PROVIDED BELOW FOR YOUR NOTES
F. LIQUID/HOT WATER—diffusion of liquids using only hot water. Color in the dotted portion of the
before diagram red. The top of the before contains hot water and red food coloring, the bottom
contains just hot water. Observe the demonstration and when instructed to do so, color the
after diagram showing results, using the proper colors.
(Hint: paler shades of red should be colored in using orange)
BEFORE
AFTER
G. LIQUID/HOT WATER—diffusion of liquids using only hot water. Color in the dotted portion of the
before diagram red. The top of the before contains hot water, the bottom contains hot water
and red food coloring. Observe the demonstration and when instructed to do so, color the after
diagram showing results, using the proper colors.
(Hint: paler shades of red should be colored in using orange)
BEFORE
AFTER
NOTES:
_____________________________________________________________________________________
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_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
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3
YOU SHOULD BE WRITING NOTES AS YOU LISTEN TO MY COMMENTS DURING THIS DEMO, A SPACE IS
PROVIDED BELOW FOR YOUR NOTES
H. LIQUID/HOT AND COLD WATER—diffusion of liquids using hot and cold water. This
demonstration will be done with hot water on top and cold water on the bottom. Color the
dotted upper portion of the before diagram red and the lower portion dark blue. The top of the
before contains hot water and food coloring and the bottom contains cold water and food
coloring. Observe the demonstration and when instructed to do so, color the after diagram
showing results, using proper colors.
BEFORE
AFTER
I.
LIQUID/HOT AND COLD WATER—diffusion of liquids using hot and cold water. This
demonstration will be done with cold water on top and hot water on the bottom. Color the
dotted upper portion of the before diagram dark blue and the lower portion red. The top of the
before contains cold water and food coloring and the bottom contains hot water and food
coloring. Observe the demonstration and when instructed to do so, color the after diagram
showing results, using proper colors.
BEFORE
AFTER
NOTES:
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
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ANALYSIS AND CONCLUSION QUESTIONS:
1. Define the process of diffusion using the words: substance, concentration, and equilibrium (or
derivatives of the words) at least once each (underline the words used, or points will be
deducted).
2. Does the force of gravity affect the process of diffusion in any of our demonstrations? (YES OR
NO) _____________
Explain (why you answered yes OR why you answered no based upon your observations from
the demo activity; refer back to the demo letter section in your answer)
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
3. Compare set-ups D and E (cold water) to set-ups F and G (hot water). How did density and the
application of heat affect diffusion?
______________________________________________________________________________
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4. Explain what happened in set-up H. Why did this occur?
______________________________________________________________________________
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5. Explain what happened in set-up I. Why did this occur?
______________________________________________________________________________
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______________________________________________________________________________
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6. Does the data and notes you gathered support or rejected your #(1) hypothesis from page 1 of
this demonstration activity? (SUPPORT or REJECT) ______________________________
EXPLAIN WHY IT EITHER SUPPORTED OR REJECTED YOUR HYPOTHESIS BELOW:
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
7. Does the data and notes you gathered support or rejected your #(2) hypothesis from page 1 of
this demonstration activity? (SUPPORT or REJECT) ______________________________
EXPLAIN WHY IT EITHER SUPPORTED OR REJECTED YOUR HYPOTHESIS BELOW:
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
8. Describe/ give two examples of diffusion you have noticed outside of this classroom that hasn’t
been demonstrated or mentioned in this classroom.
(1) ___________________________________________________________________________
___________________________________________________________________________
(2) ___________________________________________________________________________
___________________________________________________________________________
BONUS QUESTIONS:
List the states of matter that can diffuse below.
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