bubbles, bubbles everywhere!

Bubbles, Bubbles Everywhere!

Lab Activity over Scientific Method, Measurement &

Graphing

You and your lab group will be developing :

1. problem statement,2. hypothesis,3. identifying variables and

4. procedure

for this lab activity based on the materials and safety precautions that are provided below.

• 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.

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

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

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.

Data TableType of

SoapTrial 1 Trial 2 Trial 3 Average

Graphing Review

0102030405060708090

Green Blue Orange Puple

0102030405060708090

100

0 10 20 30 40 50 60 70 80 90 100

0102030405060708090

Green Blue Orange Puple

0102030405060708090

100

0 10 20 30 40 50 60 70 80 90 100

PieBar

Line

Three main types of graphs:

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.

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

When a scientist conducts an experiment, he/she carefully observes what is happening.He/She records information called data.

The data is often a set of numbers.

Time (s) Temp. (C)

0 s 15 0

30 s 18 0

60 s 20 0

90 s 22 0

It is important for scientists to be able to take data...

And make it into a visual “picture” of what the data says...

In order to make valid conclusions from experiments...

Such as numbers

Time Temp. in C0 min 01 min 02 min 03 min 34 min 145 min 256 min 367 min 478 min 589 min 69

10 min 8011 min 9112 min 9813 min 9814 min 9815 min 100

What does this data look like?

Time

Temp

Line graphs take data and give us a picture of what that data looks like:

This graph helps us to understand the relationship between time and

temperature.

0102030405060708090100

0 1 2 3 4 4 6 7 8 9 10 11 12 13 14 15

Time Temp. in C0 min 01 min 02 min 03 min 34 min 145 min 256 min 367 min 478 min 589 min 69

10 min 8011 min 9112 min 9813 min 9814 min 9815 min 100

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.ch

ange

s changesVariables

Experiment: You are measuring the temperature in degrees Co of a water sample as it is heated over a period of 30 minutes.

You DECIDE the interval (each minute) to collect data (temperature).

Time (min) Temp. (C)

0 min 0 0

1 min 0 0

2 min 0 0

3 min 1 0

4 min 5 0

Interval you

collect data or

independent variable

The data collected

or depende

nt variable

at it is

time

temperature

In this table there are two variables:

Time Temp. in C0 min 01 min 02 min 03 min 34 min 145 min 256 min 367 min 478 min 589 min 69

10 min 8011 min 9112 min 9813 min 9814 min 9815 min 100

Time

temperature

Which is the independent variable? Time Temp. in C0 min 01 min 02 min 03 min 34 min 145 min 256 min 367 min 478 min 589 min 69

10 min 8011 min 9112 min 9813 min 9814 min 9815 min 100

...is the independent variable because this is the specific interval you chose to collect data. The scientist “controls” this variable.

temperature

Which is the dependent variable? Time Temp. in C0 min 01 min 02 min 03 min 34 min 145 min 256 min 367 min 478 min 589 min 69

10 min 8011 min 9112 min 9813 min 9814 min 9815 min 100

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

1. Determine the independent and dependent variables in your table.

2. Label each axis: x-axis independent and y- axis dependent.

4. Number and label each axis.

5. Plot the data points.

6. Connect the data points.

7. Title the graph.

3. Find the variable range: “middle value” is halfway on the graph scale.

Constructing a Graph::