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

Objective SWBAT write up a lab report using a rubric.

Cellular Respiration and Exercise Lab Title Cellular Respiration and Exercise Lab

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

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.

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 6 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?

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

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.

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)?

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?

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).

Materials Bromothymol Blue solution Graduated cylinder Drinking Straw Stopwatch Plastic cups

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

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