Edexcel IGCSE Biology · Spec 2.50
Investigating Carbon Dioxide in Exhaled Air
Covers compare carbon dioxide in inhaled and exhaled air, Use a suitable indicator and control and Design a safe and repeatable method.
Biology revision video
Investigating Carbon Dioxide in Exhaled Air
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Spec 2.50
What you need to know
- Compare carbon dioxide in inhaled and exhaled air
- Use a suitable indicator and control
- Design a safe and repeatable method
Active recall
Quick check
Answer each question before opening the answer.
Why does exhaled air contain more carbon dioxide?
Carbon dioxide is produced by respiration and transported to the lungs
Name two variables that must be controlled
Any two from indicator volume, air volume, flow rate, temperature and starting colour
What colour change is expected with more carbon dioxide?
Hydrogencarbonate indicator changes towards yellow
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