1. Bell ringer
How could you determine how much cellular respiration was taking place?
You have to measure something
1 glucose + 6 oxygen carbon dioxide + 6 water + 36 ATP

2. Objective
SWBAT write up a lab report using a rubric.

3. Cellular Respiration and Exercise Lab
Title
Cellular Respiration and Exercise Lab

4. How to write up an experiment
Before you carry out any lab, you will need to have completed
A purpose question
A hypothesis
A materials list
A set of SPECIFIC, SCIENTIFIC procedures
A data table

5. Our topic: How does exercise affect cellular respiration?
Let’s think about what we know about cellular respiration and how it works. This would go in the introduction section.

6. Background Information
What happens when we breathe?
We take in oxygen which is transported to our cells so the cells can make ATP. Oxygen is used according to the formula:
1 glucose + 6 oxygen carbon dioxide + 6 water + 36 ATP
The process produces carbon dioxide and water in addition to ATP.
So what happens when we exercise? We breathe faster—what does that do?

7. Background Information
We can measure the amount of carbon dioxide produced using an indicator.
Bromothymol blue is an indicator for carbon dioxide which means that it will change color if CO2 is added to it. When CO2 reacts with water it forms a weak acid, which the indicator detects. The more CO2 that is added to the water, the faster it changes color.
Bromothymol blue solution changes color from dark blue to light green

8. Bromothymol Blue
Bromothymol blue is a CHEMICAL. You need to be careful while handling it. Do NOT ingest this material.
Bromothymol blue is a CHEMICAL. You need to be careful while handling it. Do NOT ingest this material.

9. Write Your Purpose Question
Our task is to figure out how exercise affects carbon dioxide production. How should we do that?
Be specific:
Independent Variable?
Dependent Variable?
Format: What is the effect of (the independent variable) on the (dependent variable)?

10. Control Group
This is the condition of the experiment that you do nothing to
It allows you to make a comparison
What will be the control group in our experiment?

11. Write your hypothesis No “I think” – just state your answer.
If (state what we are going to do to the independent variable), then (state what we expect will happen to the dependent variable).

12. Materials Bromothymol Blue solution Graduated cylinder Drinking Straw
Stopwatch
Plastic cups

13. Write your procedure Procedure must: Be written in steps
Include specific, reproducible information
Example: In a 200 mL beaker, add 100 mL of water
Be as controlled as possible
Example: same person exercises every time

14. Make your data table
Table should have a title and proper column headings
Independent variable should be on the left and dependent variable on the right
Correct units should be included