The Scientific Method Worksheets Page 2
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3Name:________________________________
TOC#________
c. Rank the following [1 =lowest density; 5= highest density]
______ %1 milk ______ dish soap ______ whole milk ______ food coloring ______ 2% milk
d. What is the relationship between dish soap and fat? __________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
3. Construct a hypothesis: After thoroughly reviewing the materials and procedures, in a single sentence
predict the outcome of this experiment. It should be what you think the “answer” to your question is.
_______________________________________________________________________________________
_______________________________________________________________________________________
4. Test with an experiment: sometimes during the scientific method you will design an experiment with your
own procedures. Other times the procedures will be given to you.
Procedures (work in your lab/table groups)
1. Match the milk samples with the appropriately labeled Petri dish. Into each petri dish, pour enough of
the correct milk so that the milk completely covers the entire bottom surface of the
dish.
2. Following the diagram dispense FOUR (AND ONLY FOUR) drops of food
coloring into the whole milk petri dish on the outside edge of the milk (touching the
walls of the dish).
3. After one minute, record detailed observations in the data table.
4. Place one drop of dish soap in the center of the milk layer.
5. After one minute, record detailed observations in the data table.
6. Repeat steps 2 thru 5 for the 2% milk
7. Repeat steps 2 thru 5 for the 1% milk
8. Clean-Up: discard the entire contents of the dish into the sink. Rinse and dry each dish and place back
on your tray the same way you found them.
Procedures Flow Chart: In the future you will be required to do this on your own. This flow chart should help
you organize the procedures in a way that makes sense to you. It does not have to look exactly like this. It
never needs to be typed. This time I have done it for you as an example.
pour milk in
•make sure to cover the whole
correct dish
dish
Repeat steps for 2% milk.
Repeat steps for 1% milk.
add four
Record all observations in chart!
•see diagram
drops of food
•wait 1 minute/record
coloring to
whole milk
o Clean up:Rinse everything and
leave it how you found it.
•record
add dish soap
observations.
Experimental Design
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