Stage 4 OEI 2012
Stage 4 Open Ended Investigation
Report template
Investigating bubbles
The Problem
What are you going to vary on purpose and measure?
The independent variable (IV) The measurement of the water =
What is the other variable that changing your IV will affect?
The dependent variable (DV) The detergent
Aim of the experiment
The aim of the bubble experiment is to see if the amount of water will change how long the bubble last for.
Collect information
Collect information relevant to your particular investigation.
Each of the questions should be answered in your own words. DO NOT copy and paste.
Why does a bubble form in soapy water?
The soap molecule will usually have A water loving end and a oil loving end that don't like to mix. So the soap will play around with the water making a soap bubble.
Why are bubbles usually a sphere in shape?
Bubbles are in the shape of a sphere because bubbles have limited energy and need to find the shape that is the most stable and that is a sphere _
Write a third interesting question of your own about bubbles and the answer you found to the question.
Why do bubbles pop when they have contact with any type of material ?
The answer you found to your question.
The surface of a bubble is very fragile. What keeps a bubble together is molecules that are very delicate and when in contact breaks the bubble.
Name two websites you used to answer the questions. Give their URL and the date you visited them. This information could be presented in a table such as the one shown below.
Name of website
URL
Date visited
Yahoo Answers
Wikipedia
The hypothesis
If I add more water then the bubble will last longer.
Method
To be a fair test only one variable should be changed on purpose (IV) to see how it affects the other variable (DV). For the method you will describe below name and describe how you will keep at least 4 things in your experiment the same, while you deliberately change the IV and see how this affects the DV. Complete a similar table to the one below:
Variables I will keep the same
How I will keep them the same
1
The Bubble wand.
I will keep this in reach and wont swap wand
2
The Jars
Wont change jars
3
The type of water
I will fill the jars with the same tap.
4
Same detergent
Will use same detergent
Safety
Identify two potential safety issues for this particular experiment and describe how you will minimise the risks involved
Potential safety issue
How risk is minimised
1
2
3
etc
Materials
etc
Procedure
1.
2.
3. etc
Photo evidence
Results
Table
Title
Independent Variable
Dependent variable
Trial 1
Trial 2
Trial 3
Trial 4
Trial 5
Average
Reading 1
Reading 2
Reading 3
Reading 4
Reading 5
Graph
Title
Discussion
Do your results shown in your graph support your hypothesis or not?
Explain how.
Did you have any problems while performing this experiment?
How could you improve this experiment if you were going to do it again?
Based on the results of your experiment write another hypothesis you could investigate about bubbles.
Can you relate your results to your background information to explain your results?
Conclusion
8