Bubbles, Bubbles Everywhere!

1. Bubbles, Bubbles Everywhere! Lab Activity over Scientific Method, Measurement & Graphing

2. You and your lab group will be developing :1. problem statement,2. hypothesis,3. identifying variablesand 4. procedurefor this lab activity based on the materials and safety precautions that are provided below.

3. At the end of the lab you will need to • make a bar or line graph of your results • draw a conclusion. • Was your hypothesis correct or incorrect? • Each partner will turn in their work on a piece of notebook paper.

4. Lab Write Up: • On your own note book paper you need a: • Title • Problem Statement • Hypothesis • Independent/ Dependent Variable • Constants/Controls • Procedure • Data table with your results • Graph of your results • Conclusion

5. Materials • Ruler • 50mL of Dawn soap solution • 50mL of Palmolive soap solution • 50 mL of Extreme Bubbles soap solution • Straws • 3- 50 mL Beakers • Paper towels • Flat surface- lab table/desk

6. Safety Precautions • Goggles must be worn during this lab investigation. • Do not drink or ingest the liquid soap solutions. • A straw is assigned to each person, do not share straws and throw away your straws as soon as you finish.

7. Data Table

8. Graphing Review

9. Three main types of graphs: Pie Bar Line What are these graphs trying to communicate? You see numbers and names, but without background we really do not know what these graphs are trying to communicate.

10. Let’s look at an example of how a graph is used...

11. 30 s 18 0 20 0 60 s 22 0 90 s When a scientist conducts an experiment, he/she carefully observes what is happening. He/She records information called data. Time (s) Temp. (C) 0 s 15 0 The data is often a set of numbers.

12. It is important for scientists to be able to take data... #'s Such as numbers And make it into a visual “picture” of what the data says... In order to make valid conclusions from experiments...

13. What does this data look like?

15. Line graphs take data and give us a picture of what that data looks like: Temp Time This graph helps us to understand the relationship between time and temperature.

16. changes changes Variables Experiment: You are measuring the temperature in degrees Co of a water sample as it is heated over a period of 30 minutes. A variable is what “changes” in an experiment.

17. To make graphs You need to know how to recognize the independent variables dependent

18. Experiment: You are measuring the temperature in degrees Co of a water sample as it is heated over a period of 30 minutes. 0 min 0 0 1 min 0 0 0 0 2 min 1 0 3 min 4 min 5 0 YouDECIDE the interval (each minute) to collect data (temperature). Time (min) Temp. (C) Interval you collect data or independent variable The data collectedor dependent variable at it is

19. In this table there are two variables: time temperature

20. Which is the independent variable? Time ...is the independent variable because this is the specific interval you chose to collect data. The scientist “controls” this variable. temperature

21. Which is the dependent variable? temperature ...is dependent on the time so the temperature is the dependent variable. This is the data that a scientist collects.

22. Constructing a Graph:: Determine the independent and dependent variables in your table. 2. Label each axis: x-axis independent and y- axis dependent. 3. Find the variable range: “middle value” is halfway on the graph scale. 4. Number and label each axis. 5. Plot the data points. 6. Connect the data points. 7. Title the graph.