ARE FOSSIL FUELS A SOURCE OF CARBON DIOXIDE?
(recommended as a teacher demonstration) 1. Fill test tube E approximately 1/3 full of BTB. 2. Take the exhaust-filled balloon, carefully untwist the tie while holding the neck of the balloon so that the gas does not escape. Twist and pinch the neck of the balloon to prevent air from escaping, but dont tie it. (notes on how to get exhaust filled balloon below in Notes to the Teacher…) 3. While still preventing the gas from escaping, insert a straw into the neck of the balloon up to the twisted portion. Have one team member seal the opening of the balloon tightly to one side and pinching it off with their fingers. You may need to practice this a few times with a regular air-filled balloon. 4. Insert the straw into test tube E. 5. Insert a cotton ball not the top of test tube E to help hold the straw steady. 6. Gently release air from the balloon by slowly untwisting the neck. Allow the gas to bubble out at a steady rate until the balloon is empty. 7. What happened? After finishing all
