1. Bubble Gum Lab Scientific method
Kline
Biology

2. Bellringer
Go wash your hands in the lab sinks in the back of the classroom.
Please throw away all paper towels in the garbage. No messes!!!!
Get two pieces of gum (hubba bubba and double bubble)
Get two pieces of wax paper, one piece of string, and a ruler
Carefully get a triple beam balance out of the closet (next to your notebooks)

3. What brand of gum should be used???
Scientific Problem
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You are in a competition to break the Guinness World Record for blowing the largest bubble!
What brand of gum should be used???

4. Does sugar content in gum affect the size of the bubble?
Write the scientific question at the top of your paper
Skip a space a write Background Research
As you read the Bubble Gum Article, takes notes under the background research section.
Use a bulleted list

5. Observations Take a look at the two pieces of gum.
Make a T-Chart for your observations.
Make observations such as grams of sugar, texture, color, smell, weight, shape, etc.

6. How are you going to test this scientific question?
Discuss this with your partner and design an experiment on your planning sheet.
You must construct some kind of chart in order to record your data.
How many times will you test each brand?
What units will you use?
How will you know if your experiment worked?
What variables will need to remain constant?
Will you have a control?
What will your independent and dependent variable be?
What will you do if one of the trials had a pre-mature bubble break?

7. Planning Sheet
Let’s fill this out together!

8. Scientific question
Does sugar content affect the size of the bubble?

9. Hypothesis
The gum brand with the lowest sugar content will blow the biggest bubble.

10. Independent Variable
Brand of Bubble Gum

11. Dependent Variable
The size of the bubble

12. Constants Same person blowing the bubble
Same amount of breath/force being used to blow bubble
Same person measuring
Same instruments used to measure
Standing the whole time
Chew each piece 10 minutes before blowing

13. Control
None
Not all experiments have a control.

14. Potential Problems Pre-mature break
Getting muscle fatigue (tired) from chewing and blowing bubbles
Wind/Movement around the room
Not using the same amount of time for each trial
Getting stuck to the string

15. How will you know if your experiment worked?
Look for consistency!!!!
Data (bubble width in cm) should all be relatively close in size.
If the trials are: 1cm, 15cm, 5cm, 18cm, and 10cm…….You have a problem!!!
Bubble sizes should not vary more than a few centimeters for any particular brand.

16. Data Chart Double Bubble Hubba Bubba Trial 1 15.3 cm 17.6 cm Trail 2
Average
75.3/5 = 15.1cm
86.5/5 = 17.3 cm

17. Materials
2 brands of bubble gum
String
Ruler
Wax paper

18. Graphing your Results
Make a bar graph comparing the AVERAGES of each brand!
Y-axis is the dependent variable
X-axis is the independent variable

19. On the back of your graph, write a conclusion
Part 1– Restate the original hypothesis
Part 2– State if the data supported the hypothesis, Yes or No, and explain. Use the actual data (numbers!) in this statement.
Part 3 – Write a conclusive statement to “wrap up” the discussion of the data.
Do not use pronouns in the conclusion!!! No I, We, You, Your, Us, They, etc.