determing whether expired air contains CO2.
1.Formulate hypothesis
2.Aim
3. a) idependent V, dependent and controlled variables
4. methods step by step
5. observation
What is your question?
I think Andrea wants us to do her assignment.
1,2,3
To demonstrate that exhaled air contains carbondioxide
1. Formulate hypothesis: Start by formulating a hypothesis about whether expired air contains carbon dioxide (CO2). For example, a hypothesis could be "Expired air contains a measurable amount of carbon dioxide."
2. Aim: Clearly state the aim of the experiment, which is to investigate whether expired air contains CO2.
3. a) Independent variable: Determine the variable that you will manipulate in the experiment. In this case, the independent variable could be the duration of expiration or the activity level of the person exhaling the air.
b) Dependent variable: Identify the variable that you will measure or observe as the outcome of the experiment. In this case, the dependent variable is the presence or absence of CO2 in the expired air.
c) Controlled variables: List the variables that you will keep constant throughout the experiment. These variables should not change and could include the temperature, humidity, and atmospheric pressure.
4. Methods step by step:
a) Set up your experiment: Gather the necessary materials, such as an apparatus to collect expired air (e.g., a breathing tube or bag), a carbon dioxide detector or analyzer, and any other required equipment.
b) Design the procedure: Plan how you will collect, analyze, and measure the expired air. For example, this could involve having a participant exhale into a bag, capturing the air sample, and then using a CO2 detector to measure the level of carbon dioxide.
c) Test your procedure: Run a pilot test to ensure that your methodology works correctly and provides accurate results. Make any necessary adjustments or modifications based on the pilot test.
d) Collect data: Conduct the experiment by having multiple participants exhale into a bag or directly collecting expired air samples. Use the CO2 detector to measure and record the amount of carbon dioxide present in each sample.
e) Analyze the data: Assess and interpret the collected data, looking for patterns or trends. Determine if the presence of carbon dioxide in the expired air supports or refutes your hypothesis.
5. Observation: Document your observations and findings. Record any relevant information, including the amount of CO2 detected in the expired air samples, any variations based on the independent variable, and any other observations during the experiment.
Remember to follow ethical guidelines, obtain informed consent (if applicable), and ensure the safety of participants and yourself while conducting the experiment.